Updated on 2024/06/22

写真a

 
SHIINO Yuta
 
Organization
Academic Assembly Institute of Science and Technology CHIKYU SEIBUTSU KAGAKU KEIRETU Associate Professor
Faculty of Science Department of Science Associate Professor
Title
Associate Professor
External link

Degree

  • 博士(理学) ( 2009.3   東京大学 )

  • 修士(理学) ( 2006.3   静岡大学 )

  • 学士(理学) ( 2004.3   静岡大学 )

Research Interests

  • fossil

  • functional morphology

  • evolution

  • Palaeozoic

  • invertebrate

  • evolutionary morphology

  • palaeontology

  • radiolarian

  • biomechanics

  • brachiopod

  • trilobite

  • biofluids

Research Areas

  • Life Science / Biodiversity and systematics  / 進化形態学

  • Life Science / Evolutionary biology

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Fluid engineering

  • Natural Science / Solid earth sciences

  • Natural Science / Biogeosciences

Research History (researchmap)

  • Niigata University   Department of Geology, Faculty of Science   Associate Professor

    2016.4

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  • Niigata University   Assistant Professor

    2014.4 - 2016.3

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  • The University of Tokyo   The University Museum   Specially Appointed Assistant Professor

    2012.4 - 2014.3

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  • National Museum of Nature and Science, Tokyo   JSPS Research Fellow

    2010.4 - 2012.3

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  • The University of Tokyo   JSPS Research Fellow

    2008.4 - 2010.3

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Research History

  • Niigata University   Faculty of Science Department of Science   Associate Professor

    2017.4

  • Niigata University   Abolition organization Earth Material Science   Associate Professor

    2016.4 - 2017.3

  • Niigata University   Graduate School of Science and Technology Environmental Science and Technology Earth Science   Assistant Professor

    2014.4 - 2016.3

Professional Memberships

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Qualification acquired

  • Museum Attendant

 

Papers

  • Death or living assemblage? The Middle Permian discinid brachiopods in the Kamiyasse area, Southern Kitakami Mountains, northeastern Japan Reviewed

    Masao Masunaga, Yuta Shiino

    Paleontological Research   25 ( 3 )   258 - 278   2021.7

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Paleontological Society of Japan  

    DOI: 10.2517/2020pr023

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  • A morphological analysis of the flat-shaped spumellarian radiolarian Dictyocoryne: morpho-functional insights into planktonic mode of life Reviewed

    Yuta Shiino, Toshiyuki Kurihara, Ryo Ichinohe, Naoko Kishimoto, Takashi Yoshino, Atsushi Matsuoka

    Paleontological Research   24 ( 2 )   134 - 146   2020.4

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:PALAEONTOLOGICAL SOC JAPAN  

    The three-dimensional morphology of the flat-shaped spumellarian radiolarian Dictyocoryne was analysed using a microfocus X-ray CT with a special focus on whether it was capable of a planktonic lifestyle. Two types of 3D models, the shell model, which represents a realistic 3D shell, and the wrapped model, which mimics the whole body outline without pseudopodia, were reconstructed in order to estimate volume, surface area, and centres of gravity for the shell model and buoyancy for the wrapped model. The calculated values showed that the volume of shell with respect to the total volume was negatively allometric, regardless of the differences between threshold settings. Stepwise secretions of the patagium layer may result in a comparatively lightweight shell, thereby decreasing the total density during growth but not below the density of seawater. Estimated positions for the centres of gravity and buoyancy were too close to maintain an autonomous posture while floating. Instead, the ratio between surface area and volume was greater than that in an ideal sphere. Such a broad surface area could obtain the viscous resistance necessary for sinking retardation. Spumellarian radiolarians, including Dictyocoryne, have photosynthetic symbionts located primarily in the ectoplasmic layer, which is a habitable space that can be maximised within the larger surface area. Given that radiolarians float when extending their pseudopodia, it can be hypothesised that pseudopodia may play a role in the adjustment of life posture in a hydraulically unstable shell, which can be integrated into sinking retardation, enhancement of photosynthetic activity and manoeuvrability of life posture within a unique flat-shaped morphogenesis.

    DOI: 10.2517/2019PR020

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  • Active floating with buoyancy of pseudopodia versus passive floating by hydrodynamic drag force: A case study of the flat-shaped spumellarian radiolarian Dictyocoryne Reviewed

    Ryo Ichinohe, Yuta Shiino, Toshiyuki Kurihara, Naoko Kishimoto

    Paleontological Research   23 ( 4 )   236 - 244   2019.10

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    It has been suggested that the pseudopodia of radiolarians play a role in controlling buoyancy for floating behaviour. To understand the function of pseudopodia in terms of planktonic capability, we performed culture experiments on the flat-shaped radiolarian Dictyocoryne. A glass cell, a stereomicroscope and an X-Y-Z stage were used to observe the behaviour of Dictyocoryne from a lateral view. Under static conditions, Dictyocoryne grounded on the bottom of the glass cell extended pseudopodia from both sides of the flat disc surface. Subsequently, these individuals rose slightly by a length equal to that of the extended pseudopodia but remained attached to the bottom. These results suggest that Dictyocoryne lacks the ability to surface by obtaining buoyancy through the emergence of pseudopodia. Under conditions of convection flow, Dictyocoryne moved in the downstream direction only when pseudopodia were completely extended. When the convection flow moved upward, the individuals moved with the flow to just under the surface. In addition, convection flow changed the direction of a long, thick pseudopodium, called the axoflagellum, to be parallel with the flow. Consequently, the axoflagellum was always oriented towards the downstream side, being the disc face in the axollagellum side on the upturn. Given that the flat-shaped spumellarians has c symbiotic algae inside their cells, their unique planktonic capability leads to the stable efficiency of the algal photosynthesis.

    DOI: 10.2517/2018PR023

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  • The passive spatial behaviour and feeding model of living nassellarian radiolarians: Morpho-functional insights into radiolarian adaptation Reviewed

    Ryo Ichinohe, Yuta Shiino, Toshiyuki Kurihara

    Marine Micropaleontology   140   95 - 103   2018.4

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Sinking experiments using living nassellarian radiolarians with a conical shell form were performed to examine the spatial behaviour of nassellarians and a related feeding model. A small water tank and surface-reflecting mirror were used to observe the vertical movement of each specimen, and the sinking posture and speed were analysed. The experimental results showed that the sinking posture of nassellarians was stable with a cephalis-down orientation, and the sinking speed was considerably slower than that of Dictyocoryne spp. as a control experiment. The stable posture was maintained by a streamlining shell form and the relationship between the centres of gravity and buoyancy. Moreover, a lift force in moving fluids would likely change the posture of the organism to the cephalis facing upstream, as in a weathercock effect. As a result, nassellarians were able to capture organic matter around the rear side of the aperture where prey-capturing pseudopodia are extended. Because the pseudopodia may be attributed to the lifelong performance of the surface of cell membranes, the drastic change in flow intensity around the pseudopodia leads to an easier collapse of the prey-capturing apparatus. A slower sinking speed as the size increases is a beneficial feature for avoiding the feeding risk, resulting in effective predation as a form of homeostatic spatial behaviour.

    DOI: 10.1016/j.marmicro.2018.02.002

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  • How does flow recruit epibionts onto brachiopod shells? Insights intoreciprocal interactions within the symbiotic framework Reviewed

    Yuta Shiino, Yuki Tokuda

    Palaeoworld   25 ( 4 )   675 - 683   2016.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ELSEVIER SCIENCE BV  

    Computational fluid dynamics simulations were performed to examine the passive recruitment of epibionts onto Devonian spiriferide brachiopod host shells. Because many planktonic larvae and spores are propulsion-inefficient swimmers, we determined the areas most prone to settlement in terms of inertial impaction and direct interception, which are characteristic of higher and lower pressure, respectively. Simulations on a unique specimen of Paraspirifer with a geopetal structure of broken brachidia suggest that the larva of Aulopora on the shell was transported and had settled onto the shell through inertial impaction after the host was dead and overturned on the sea floor. In the case of an ideal life posture, the spiriferide models received higher pressure on the shell surfaces at the forward and rearward stagnation areas and lower pressure along the shell margins and the anterior part of the sulcus, regardless of whether the ventral or the dorsal valve was facing upstream. Both sites seem to be available for epibionts by way of direct interception or inertial impaction. Our results indicate that the initial recruitment of most epibionts is accidental and passive, whereas the directions and patterns of epibiont growth suggest a biological response to ambient conditions. (C) 2016 Elsevier B.V. and Nanjing Institute of Geology and Palaeontology, CAS. All rights reserved.

    DOI: 10.1016/j.palwor.2016.04.001

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  • Late Ordovician Holorhynchus succession in the Siljan district, Sweden: facies, faunas and a latest Katian event Reviewed

    Yuta Shiino, Yutaro Suzuki, David A. T. Harper, Hideki Mori, Jan Bergstrom

    GFF   137 ( 1 )   25 - 35   2015.1

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    The pentameride brachiopod genus Holorhynchus is a useful tool for correlation of the upper part of the Katian Stage in the Upper Ordovician. Holorhynchus occurs in the Boda Limestone, Siljan district, Sweden, but is generally only known from taxonomic descriptions. Here, we report in detail fossil occurrences relating morphology and sedimentary facies within the context of a major faunal turnover during the latest Katian. The specimens occur exclusively within the intercalated beds of pelmicritic mudstone and fossiliferous layers, which are down-slope storm deposits. The comparison of sedimentary features between the beds with and without Holorhynchus suggests that the animal inhabited fluid conditions on a muddy substrate, such as the channel environment reconstructed herein. The geological and autecological evidence suggests that the environmental conditions on the seabed were eutrophic. The opportunist Holorhynchus rapidly explored new habitats during a time of transition.

    DOI: 10.1080/11035897.2014.945619

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  • Hydrodynamic advantages in the free- living spiriferinide brachiopod Pachycyrtella omanensis: functional insight into adaptation to high- energy flow environments Reviewed

    Yuta Shiino, Lucia Angiolini

    Lethaia   47 ( 2 )   216 - 228   2014.4

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    Immobile benthic organisms lacking attachment or cementation mechanisms are considered to be best adapted to quiet bottom environments. Since the free-living Lower Permian spiriferinide brachiopod Pachycyrtella omanensis inhabited a sandy substrate with high-energy water flow, flume experiments were performed to show the possible hydrodynamic advantages of shell morphology in postural stability and generation of feeding flows. Modelling indicates that a vertical position, with the commissure plane perpendicular to the seabed, was the most unstable, although it is considered to have been its original life position. On the other hand, the passive flow inside the model in vertical position exhibited vortex movement with constant degree of inhalent flow and exhalent flow, conferring advantages on the effective filtration of food particles using a spiral lophophore. The intensity and movement of the passive flow for feeding could have been adjusted through changes in the angle of opening of the valves. As the shoreface habitat was affected by oscillatory flows, a small-sized animal could have undergone a high risk of burial, while an increase in size would have led to easier removal from the sandy bottom. To avoid both physical risks, Pachycyrtella developed a thick shell with a high rate of growth, specifically increasing the weight of the ventral umbo without altering its morphofunction to generate passive feeding flows. Biomechanics, functional morphology, opportunistic species, Pachycyrtella, Spiriferinida, suspension feeder.

    DOI: 10.1111/let.12052

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  • Pelagic or benthic? mode of life of the remopleuridid trilobite hypodicranotus striatulus Reviewed

    Yuta Shiino, Osamu Kuwazuru, Yutaro Suzuki, Satoshi Ono, Chihiro Masuda

    Bulletin of Geosciences   89 ( 2 )   207 - 218   2014

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Czech Geological Survey  

    The mode of life of the remopleuridid trilobite Hypodicranotus striatulus Walcott (1875) was examined hydrodynami-cally with a special focus on the relationship between the autecological performances of swimming and feeding. To understand the effect of swimming height from the sea bottom on the hydrodynamic performance of the exoskeleton, we performed computational fluid dynamics simulations on four models at differing distances from the sea bottom. The results indicated that Hypodicranotus could launch itself from the sea bottom with a relatively strong hydrodynamic lift force from slow walking or swimming speeds. However, the lift force decreased as the swimming height increased at slow swimming speeds. Hence, Hypodicranotus would have had to increase its swimming speed to greater than 0.2 m/s and to obtain the most stable lift force at a swimming height equal to half of its own body height. Its exoskeletal morphology, with a forked hypostome, enabled it to launch itself at a slow velocity and swim at a modest distance, i.e., close to its own height, from the sea bottom. Feeding from the median vortex flows along the food groove between the two prongs of the hypostome may have been the best strategy near the sea bottom, where a large amount of food matter would have been available. Because arthropod musculature consists of striated muscles, which exhibit inferior endurance, Hypodicranotus most likely adapted to the near-bottom environment, where it could rest at times on the sea bottom as part of a nektobenthic mode of life.

    DOI: 10.3140/bull.qeosci.1409

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  • Swimming capability of the remopleuridid trilobite Hypodicranotus striatus: Hydrodynamic functions of the exoskeleton and the long, forked hypostome Reviewed

    Yuta Shiino, Osamu Kuwazuru, Yutaro Suzuki, Satoshi Ono

    Journal of Theoretical Biology   300   29 - 38   2012.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD  

    The sophisticated hydrodynamic performance achieved by the exoskeleton and the long, forked hypostome of the remopleuridid trilobite Hypodicranotus striatus was demonstrated using image-based modelling and computational fluid dynamics simulation techniques. To understand the function of the long, forked hypostome, we examined two types of exoskeletal models, one with and one without the hypostome. We simulated the flow structures around the exoskeletal models under several ambient flow velocities to evaluate the shapes of the streamlines, the values of the drag and lift forces and the relevant coefficients acting on the models. The simulation results showed that the long, forked hypostome prevents the formation of a ventral vortex; thus, it stabilises the flow structure under all of the ambient velocities tested. Moreover, the hypostome functions to create positive lift, with stable lift coefficients observed under a wide range of velocities, and to reduce the drag coefficient as velocity increases. These results imply that the hypostome can reduce viscous drag with a modest lift force, which is an essential requirement for actively swimming animals. We conclude that the long, forked hypostome evolved to provide an active and stable swimming system, and we therefore hypothesise that Hypodicranotus exoskeletal morphology resulted from the adaptation to be a high-performance swimmer. (C) 2012 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jtbi.2012.01.012

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  • Ptycholophous lophophore in a productidine brachiopod Reviewed

    Yuta Shiino, Shokei Yamada, Yutaro Suzuki, Chisato Suzuki

    Paleontological Research   15 ( 4 )   233 - 239   2011.12

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:PALAEONTOLOGICAL SOC JAPAN  

    The internal morphology of the productide brachiopod Anidanthus ussuricus from the Middle Permian of the Takakurayama area, Fukushima Prefecture, Japan, shows an evident pattern of brachial ridges that are identified as a four-lobed ptycholophe of the feeding organ or lophophore. Because a ptycholophe has not previously been identified in productidines, we describe this structure to provide further insight into the morphology of the productide lophophore. A comparison of the lophophores between the productides and the extant thecideoids suggested that during the growth of productides, the disposition of a multilobed ptycholophe requires the development of elevated platform-like ridges or the enlargement of the dorsal valve, both of which provide greater area for the attachment of the lophophore. In contrast, the simple ptycholophe of Anidanthus is located on a faint relief of brachial ridges, which agrees with what has been observed fir the thecideoid ptycholophe. Because the productide shell form plays a role in the generation of passive feeding flows, it is expected that the productide feeding system, which supplies the energetic demands of the organism, would develop in response to the interaction between the lophophore and the overall shell form of productides.

    DOI: 10.2517/1342-8144-15.4.233

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  • The ideal hydrodynamic form of the concavo-convex productide brachiopod shell Reviewed

    Yuta Shiino, Yutaro Suzuki

    Lethaia   44 ( 3 )   329 - 343   2011.9

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    Water-flume experiments were performed to determine whether the concavo-convex Permian brachiopod Waagenoconcha imperfecta was hydrodynamically adapted for feeding. The generation of passive currents inside the valves was observed experimentally. The use of four transparent, hollow polyhedron models, each differing in a single morphological feature, permitted observation of the currents inside the valves and allowed evaluation of the hydrodynamic significance of the ears and the prominent geniculated trail. Regardless of the direction of ambient flow, only the approximate-imitation model generated a stable flow pattern consisting of inhalation from the ear gapes and exhalation from the anterior trail gape; models lacking or with small changes in these morphological features failed to generate stable flow patterns. The stable flow pattern was probably maintained by a pressure difference between the posterior lower ear gapes (maximum pressure) and the anterior trail gape (minimum pressure). Notably, bilaterally rotating internal currents formed parallel to the brachial ridges; such flow patterns would facilitate the capture of food particles by the animal via tentacles on its lophophore, which is most likely were located on the brachial ridges. Our results demonstrate that the immobile brachiopod W. imperfecta, an animal incapable of widely opening its valves, probably fed on the passive internal currents generated by its shell form. This unique valve morphology appears to be perfectly adapted from a hydrodynamic point of view.

    DOI: 10.1111/j.1502-3931.2010.00243.x

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  • Sedimentary history with biotic reaction in the Middle Permian shelly sequence of the Southern Kitakami Massif, Japan Reviewed

    Yuta Shiino, Yutaro Suzuki, Fumio Kobayashi

    Island Arc   20 ( 2 )   203 - 220   2011.6

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    The transition of sedimentary environments and their organism-related responses is exemplified in the active margin setting of the Middle Permian in the Southern Kitakami Massif. The transition in the sedimentary environment began with a shallowing-upward sequence at an upper slope to an outer shelf depositional setting that was associated with a delta system which transported abundant botanic remains in the Hoso-o Formation. By contrast, the sediments of the overlying Kamiyasse Formation, the base of which is roughly equivalent to the lowermost Capitanian, were deposited at a lower shoreface to the outer shelf setting, which originated from complex depositional sources, including beach, near shore reef mounds and a nearby independent area of shallow and hard substratum with a considerable difference of depth. This unique depositional setting resulted in the seemingly 'mixed' fauna associated with this formation. The depositional environment of the overlying Kurosawa Formation is similar to that of the Hoso-o Formation, but with far fewer monotonous biotic remains. A comparison of lithological characteristics and fossil remains with those of neighboring regions suggests that the independent mounds were generated as if the talus formed elsewhere so as to provide a large amount of skeletal elements to a deeper basin in the earliest Capitanian. Accordingly, the complex sedimentary setting observed in the Kamiyasse Formation occurs widely throughout the South Kitakami Massif, making possible the 'mixed' and seemingly diverse fauna from a mixture of multiple allochthonous origins.

    DOI: 10.1111/j.1440-1738.2011.00760.x

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  • Theoretical approach to the functional optimisation of spiriferide brachiopod shell: Optimum morphology of sulcus Reviewed

    Yuta Shiino, Osamu Kuwazuru

    Journal of Theoretical Biology   276 ( 1 )   192 - 198   2011.5

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD  

    Evidence suggests that biological forms that provide physiological and autecological functions have evolved to adapt to environmental conditions and to optimise requisite morpho-functions. We examined whether shell morphology is functionally optimised to generate passive feeding flow in the Devonian spiriferide brachiopod Paraspinfer bownockeri. This study was based on quantitative results from a computational fluid dynamics simulation and the Lagrangian multiplier method. We estimated the optimum development of the ventral median shell depression, which is called the sulcus, by minimising the pressure difference along the gape. This estimation was made under the constraint that the number of spiral flow rotations must be greater than one, which is effective for spiriferide feeding because of its alignment with the spiral lophophore. During mathematical optimisation, the equation resulted in a suitable flow velocity of approximately 0.1 m/s. At this velocity, the pressure difference was minimised, regardless of sulcus development. The constraint equation showed that the number of spiral flow rotations increased with sulcus development. The optimal solution was similar to the original sulcus form of Paraspirifer under an ambient flow of approximately 0.1 m/s. This result suggests that the variation of shell outline in spiriferids could provide a variety of preferential conditions for ambient flow and that the flow intensity could be adjusted by sulcus development to generate a robust passive feeding flow along the spiral feeding organs. (C) 2011 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jtbi.2011.02.004

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  • Behavior of the Terebratulide Brachiopod Laqueus rubellus, with Special Reference to the Pedicle Function Reviewed

    SHIINO Yuta, KITAZAWA Kota

    Japanese journal of benthology   65 ( 1 )   18 - 26   2010.7

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    Authorship:Lead author, Corresponding author   Language:Japanese   Publishing type:Research paper (scientific journal)   Publisher:JAPANESE ASSOCIATION OF BENTHOLOGY  

    It has been widely accepted that articulate brachiopod adaptation to and radiation within various benthic environments is reflected in the variability of their attachment organ, the so-called "pedicle". To evaluate how the pedicle functions, the behavior of the terebratulide brachiopod <i>Laqueus rubellus</i>, harvested from Osezaki, Suruga Bay, Japan, was observed for one month in an aquarium. The behavior analysis focused particularly on pedicle movement and its associated muscular system. Anatomical observations of the muscular system demonstrated that the paired dorsal and ventral adjustor muscles are connected to the root of the pedicle via the mantle membrane, and the two muscles of each side cross in an x-shaped configuration. As a result, the pedicle should rotate when either set of adjustor muscles contracts. A succession of such movements would allow the animal to shift its position on the sea bottom while remaining attached to small pieces of debris, such as pebbles or bioclasts. In addition, the twisting and shaking of this brachiopod as a result of multiple successive pedicle rotations has a lifting effect due to the low density of its body compared to the surrounding sediment. Thus, this movement provides a means of avoiding burial. Previous studies of the relationships between benthic fauna and marine environments have indicated that articulate brachiopods can disperse into any benthic environment and attach to whatever debris exists. These studies have also shown that the abundance of articulate brachiopods depends on competition, nutrient supply, and predation pressure. Given the stable nutrient conditions on the sea bottom off Osezaki, competition and/or predation pressure appear to determine whether or not <i>Laqueus rubellus</i> can flourish in this benthic community.

    DOI: 10.5179/benthos.65.18

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  • Functional adaptation of spiriferide brachiopod morphology Reviewed

    Y. Shiino, O. Kuwazuru

    Journal of Evolutionary Biology   23 ( 7 )   1547 - 1557   2010.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:WILEY-BLACKWELL  

    It has been suggested that spiriferide morphologies have evolved to adapt to a variety of environmental conditions. Through a computational fluid dynamics approach, we examined how the spiriferide original form was optimized for a lotic condition, specifically addressing the functionalization of the Devonian spiriferide brachiopod Paraspirifer bownockeri to generate passive feeding flows. The results using four models, each of which differed in the development of the spiriferide shell depression, i.e. sulcus, showed that a deeper sulcus functions to create strong spiral flows so as to align on the feeding organ inside the shell. Among the sulcus-developed models, only the mimic of the natural form could generate comparative slow flows with a stable inflow area. The fossil record of spiriferides shows a morphological trade-off between the development of the sulcus and wing form. We concluded that spiriferide shells with such a morphological combination evolved to produce various feeding strategies, resulting in diversification.

    DOI: 10.1111/j.1420-9101.2010.02024.x

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  • Computational fluid dynamics simulations on a Devonian spiriferid Paraspirifer bownockeri (Brachiopoda): Generating mechanism of passive feeding flows Reviewed

    Yuta Shiino, Osamu Kuwazuru, Nobuhiro Yoshikawa

    Journal of Theoretical Biology   259 ( 1 )   132 - 141   2009.7

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD  

    A mechanism of generating passive feeding flow for the Devonian spiriferide brachiopod Paraspirifer bownockeri was theoretically elucidated through fluid dynamics simulations for flow around rigid shells. The RANS equations were used as a turbulence model, and the unsteady incompressible flow was solved using the finite volume method. Two directions of ventral and dorsal flows were investigated as typical cases where little exchange flow occurs inside the shells. The digital model of the shell was constructed using image processing of X-ray CT images of a shell replica made by molding a polycarbonate plate to a well-preserved fossil specimen of Paraspirifer. To examine the effect of flow velocity, three conditions of ambient flow velocity were adopted for both the ventral and dorsal flows. The pressure distribution along the gape showed that a relatively high pressure occurred around the sulcus in all simulated cases. This high pressure generated inflow from the sulcus and subsequent spiral internal flow, especially in fast ambient flows. This means that the sulcus generated the considerable pressure gradient around the gape passively and generated the stable intake of seawater and a spiral flow of water inside the shell for feeding. We conclude that the shell form of certain spiriferides could generate spiral flows so as to promote passive feeding, and the sulcus is interpreted as an important form for the passive intake of water. (C) 2009 Elsevier Ltd. All rights reserved.

    DOI: 10.1016/j.jtbi.2009.02.018

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  • Stratigraphy, carbonate facies and trilobite associations in the Hirnantian part of the Boda Limestone, Sweden Reviewed

    Yutaro Suzuki, Yuta Shiino, Jan Bergstrom

    GFF   131 ( 4 )   299 - 310   2009

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:TAYLOR & FRANCIS LTD  

    The Hirnantian (Upper Ordovician) sequence of the Boda Limestone is defined and described as a new formal Upper Boda Member. It has four petrologically distinct, bedded units containing three strikingly different trilobite faunas. These differences are thought to be caused by a sea-level lowering leading to the first Hirnantian sea-level lowstand and successive transgression as well as to shifts in sea-water chemistry. This is indicated by the occurrence of a level with botryoidal carbonate cement. On top follows the upper Hirnantian Glisstjarn Formation.

    DOI: 10.1080/11035890903452670

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  • Articulatory and musculatory systems in a Permian concavo-convex brachiopod Waagenoconcha imperfecta Prendergast, 1935 (Productida, Brachiopoda) Reviewed

    Yuta Shiino, Yutaro Suzuki

    Paleontological Research   11 ( 3 )   265 - 275   2007.9

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:The Palaeontological Society of Japan (PSJ)  

    The valve opening system of the Permian concavo-convex productid brachiopod Waagenoconcha imperfecta is discussed in reference to the mode of the valve articulatory system and the reconstructed musculatory system. The analysis of the articulatory system suggests that it could open to a maximum angle of 6 degrees. The characters that seem to have played the most important roles in that process are: (1) narrow ginglymus, (2) overhanging beak above the dorsal valve, and (3) relatively narrow interior space in the posterior ventral valve, which provides little space for rotating the cardinal process and in result prevents excessive shell opening. For reconstruction of the musculatory system in productide, the relationship between the contracting direction of the adductor muscles and its mode of attachment to the dorsal valve was examined in well preserved specimens of W. imperfecta. The furrows of the attachment scars are cup-shaped, and their axes are concordant to the direction of adductor contraction. This structural relationship indicates that the paired anterior and posterior muscle scars in the median sulcus represent the attachment sites of the adductor and the diductor, respectively. The reconstructed musculatory system is fairly similar to that of the extant terebratulides. The "scars" that were thought in previous studies to be the places for attachment of the massive and powerful diductor muscle in productides seem to be the imprints of the mantle canal on the interior ventral valve. All this suggests that the previous interpretation claiming that productides could open and dose valves actively, should be abandoned. © by the Palaeontological Society of Japan.

    DOI: 10.2517/1342-8144(2007)11[265:AAMSIA]2.0.CO;2

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  • Sedimentary environment and redox conditions of the Early Triassic Osawa Formation in the Southern Kitakami Terrane, Japan: insights into ocean redox stratification and faunal recovery Reviewed International journal

    Yoshino Ishizaki, Yuta Shiino

    Palaios   38 ( 4 )   210 - 232   2023.4

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    ABSTRACT

    The sedimentary environments and redox conditions of the Lower Triassic Osawa Formation in the Southern Kitakami Terrane were reconstructed based on lithofacies, trace fossils, and other paleontological content. The muddy and sandy lithofacies of the Osawa Formation lack evidence of storm waves despite the presence of storm-induced turbidites, suggesting that the oldest deposits of the Osawa Formation were deposited in the proximal part of the outer shelf. In turn, water depth increased from the lower to upper part of the formation, ultimately recording the distal part of the outer shelf. In addition to sandy lithofacies caused by turbidity and traction currents, multiple sandy layers within the muddy lithofacies would have originated via supply into the prodelta setting from a fan delta system. Collapses of the delta front or river system floods could have generated hyperpycnal flows, resulting in abundant supplies of mud and organic matter. Trace fossil analyses revealed that the degree of bioturbation (ichnofabric indices) dramatically decreased as water-depth increased, indicating a steep oxic-dysoxic gradient along the onshore-offshore transect. Diagenetic pyrite framboids indicative of dysoxic/anoxic benthic conditions are abundant at greater water depths. Abundant pyrite framboids less than 6 μm in diameter suggest intermittent euxinicity. With an increase in global weathering, abundant sediment supply including organic matter from the fan delta system could have contributed to the development of ocean redox stratification, which appears to have impacted on the adaptation of both nektic and benthic animals of this area during the Early Triassic.

    DOI: 10.2110/palo.2021.045

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  • Burrow morphology of ghost crab Ocypode stimpsoni on Ikarashi beach, Niigata, Japan Reviewed

    Yoshino Ishizaki, Masaya Ogura, Chihiro Takahashi, Maya Kaneko, Akari Imura, Yuta Shiino

    Plankton and Benthos Research   18 ( 1 )   1 - 12   2023.2

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    DOI: 10.3800/pbr.18.1

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  • A new trilobite fauna from the Middle Permian of the Kitakami Mountains/Northeast Japan Reviewed

    Ulrich Flick, Yuta Shiino

    Palaeontographica Abteilung A   320 ( 4–6 )   87 - 135   2021.9

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    DOI: 10.1127/pala/2021/0115

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  • Systematic paleontology of two brachiopod specimens (Karavankina sp. and Choristites sp.) from the Arakigawa Formation in the Hida Gaien belt, central Japan Reviewed

    Keisuke Suzuki, Yuta Shiino

    Science Reports of Niigata University. Series E, (Geology)   ( 35 )   1 - 11   2020.6

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  • 古生物の化石に数値流体解析を応用してみた Invited

    Yuta Shiino

    133 ( 1717 )   19 - 19   2018.11

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  • Crininicaminus giberti isp. nov.: Tubular trace fossil armored with crinoid stem plates from the Upper Permian Kamiyasse Formation, Northeastern Japan | Crininicaminus giberti isp. nov.: Un ichnofósil tubular de pared compuesta por placas pedunculares de Reviewed

    Seike K, Shiino Y, Suzuki Y

    Spanish Journal of Paleontology   29 ( 1 )   45 - 50   2016

  • Construction of recirculating flow tank with water pumps: insight into experimental palaeontology Reviewed

    Tsuchida, T, Shiino, Y

    Science Reports of Niigata University. Series E, (Geology)   31   83 - 90   2016

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  • A rectifying effect by internal structures for passive feeding flows in a concavo-convex productide brachiopod Reviewed

    Yuta Shiino, Yutaro Suzuki

    Paleontological Research   19 ( 4 )   283 - 287   2015.10

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    It has been experimentally shown that the shell morphology of concavo-convex productide brachiopods has the potential to generate passive flows for feeding. However, there still remains the problem of how the presence of internal soft parts influences the course and pattern of the flows. To clarify the effect of soft parts, we performed additional experiments of fluid visualisation using a flow tank and a transparent, polyhedral model with supposed soft parts in a postero-median region. Regardless of the ambient flow directions, the experimental results showed that inflows through ear gapes turned into symmetrical vortices inside the model. The soft parts altered the course of internal flows and interfered with the vortices entering the median region. Therefore, stepwise inflows pushed the precedent vortices forward as the rotational speed decreased. As a result, the slower vortices aligned with the brachial ridges on which the lophophore was arranged. Morphologically, productide brachial ridges tend to lie in the antero-lateral corners of the dorsal disc. The rectifying effect by means of soft parts, though consequential, would enable productides to sieve food particles from gentle vortices rather than from swift vortices just after the inflow through the ear gapes.

    DOI: 10.2517/2015PR011

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  • 三葉虫ハイポディクラノタスの遊泳性能と古生態

    椎野勇太, 桑水流理, 鈴木雄太郎, 増田智洋

    バイオエンジニアリング講演会講演論文集   27th ( 27 )   365 - 366   2015.1

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  • Stealth Effect of Red Shell in Laqueus rubellus (Brachiopoda, Terebratulida) on the Sea Bottom: An Evolutionary Insight into the Prey-Predator Interaction Reviewed

    Yuta Shiino, Kota Kitazawa

    ISRN Zoology   2012   1 - 7   2012.3

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    The selective advantage of empire red coloration in the shell of <italic>Laqueus rubellus</italic> (a terebratulid brachiopod) was examined in terms of prey-predator interactions. The study was based on a comparison of benthic suspension feeders living at a depth of about 130 m in Suruga Bay, Japan, with special reference to their visibility under visible and near-infrared light conditions. Almost all species exhibited red coloration under visible light, while only the shell of <italic>Laqueus</italic> was dark under infrared light, similar to rocks and bioclasts. Given the functional eyes of macropredators such as fishes and coleoids, which are specialized to detect light in the blue-to-green visible spectrum, and even the long-wavelength photoreceptors of malacosteids, <italic>Laqueus</italic> should avoid both visible and infrared detection by predators inhabiting the sublittoral bottom zone. This fact suggests that terebratulids have evolved the ability to remain essentially invisible even as the optic detection abilities of predators have improved. The present hypothesis leads to the possibility that the appearance of marine organisms is associated with the passive defensive strategy, making possible to provide a lower predation risk.

    DOI: 10.5402/2012/692517

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  • Comparative experimental and simulation study on passive feeding flow generation in <I>Cyrtospirifer</I> Reviewed

    Yuta Shiino, Osamu Kuwazuru

    Memoirs of the Association of Australasian Paleontologists   41   1 - 8   2011

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  • Microfocus X-ray CT method for the reconstruction of fossil internal structure : A case of spiriferid brachidium Reviewed

    Shiino Yuta, Kuwazuru Osamu, Yoshikawa Nobuhiro

    Fossils   87 ( 87 )   1-2 - 2   2010.3

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    DOI: 10.14825/kaseki.87.0_1

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  • Middle Permian echinoconchoide brachiopod Vediproductus in the Kamiyasse area, Southern Kitakami Mountains, northeast Japan Reviewed

    Yuta Shiino

    Paleontological Research   13 ( 3 )   251 - 258   2009.9

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    Three species of the Middle Permian echinoconchoide brachiopod Vediproductus from the Kamiyasse area, northeast Japan, V mugenjin sp. nov., V punctatiformis, and V. sp., are described, and their paleogeographic significance is discussed. V mugenjin sp. nov. is characterized as having spine bands on both the outer and inner surface of the valve, showing a strong relief with a comparatively wide interval of each band and a typical sawtooth outline of spine bands in cross-sectional view. The stratigraphic and paleogeographic distributions suggest that the genus flourished in the Tethyan province and was possibly restricted to a lower latitude than warm-cool water transitional environment.

    DOI: 10.2517/1342-8144-13.3.251

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  • Passive feeding in spiriferide brachiopods: an experimental approach using models of Devonian Paraspirifer and Cyrtospirifer Reviewed

    YUTA SHIINO

    Lethaia   43 ( 2 )   223 - 231   2009.8

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    DOI: 10.1111/j.1502-3931.2009.00185.x

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  • Middle Permian (Midian) foraminifers of the Kamiyasse Formation in the Southern Kitakami Terrane, NE Japan Reviewed

    Fumio Kobayashi, Yuta Shiino, Yutaro Suzuki

    Paleontological Research   13 ( 1 )   79 - 99   2009.4

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    A refined foraminiferal biostratigraphy of the Middle Permian Kamiyasse Formation in the Kamiyasse area north of Kesennuma, Southern Kitakami Terrane, NE Japan, is presented. Based on the stratigraphic distribution of schwagerinid and neoschwagerinid fusulinoideans, the Kamiyasse Formation, equivalent to the Kanokura Formation in the type area (Setamai-Yahagi area), is subdivided into the Monodiexodina sutchanica, Parafusulina motoyoshiensis and Lepidolina shiraiwensis Zone in ascending order, all of which appear to correspond to the Midian (latest Wordian to Capitanian) in age. The M. sutchanica Zone is here defined as integrated with cross-stratified sandstone beds in the bottom of the formation, and this zone is no longer equivalent to the previously defined M. matsubaishi (junior synonym of M. sutchanica) Zone in the Iwaizaki Limestone and the Kanokura Formation of the type area. The other two zones are defined with the first occurrences of the zonal species. Foraminifers are highly diverse along the stratigraphic interval between the Parafusulina motoyoshiensis and Lepidolina shiraiwensis Zones. Fifty-seven species belonging to 42 genera of foraminifers are identified. Nineteen species among them are systematically described and discussed, including the following three species: Baisalina rikuzenensis sp. nov., whose middle and later whorls are subdivided into more than fifteen chamberlets by septal protrusions; Wutuella sp., previously misidentified as "Cancellina" sp.; and Septagathammina sp., exclusively known from South China.

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  • COMPUTATIONAL FLUID DYNAMICS STUDY ON THE PASSIVE FEEDING FLOW FORMATION OF EXTINCT BRACHIOPOD SPIRIDERIDE

    SHIINO Yuta, KUWAZURU Osamu, YOSHIKAWA Nobuhiro

    13 ( 2 )   531 - 532   2008.5

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  • Middle Permian fusulines from the Hoso-o Formation in Kamiyasse area, southern Kitakami Mountains, Northeast Japan: Their biostratigraphic implications. Reviewed

    SHIINO YUTA, SUZUKI YUTARO, KOBAYASHI FUMIO

    地質学雑誌   114 ( 4 )   200 - 205   2008.4

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    A fusulinid fauna, newly distinguished from the calcareous conglomerate of the Middle Permian Hoso-o Formation in Kamiyasse area, southern Kitakami Mountain, Northeast Japan, consists of Sumatrina cf. annae, Pseudodoliolina pseudolepida, Chusenella sinensis, and others. An early Midian age (late Wordian) is strongly suggestive for this fauna by the presence of Sumatrina cf. annae and the absence of both primitive forms of Neoschwagerina and Afghanella indicating an early-middle Murgabian age, and advanced forms of Lepidolina and Yabeina referable to the middle-late Midian. This age assignment of the formation by fusulinids is consistent with the previous ones by ammonoids.

    DOI: 10.5575/geosoc.114.200

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  • 絶滅腕足類の化石を用いた殻まわりのイメージベース流体解析

    椎野勇太, 桑水流理, 吉川暢宏

    バイオエンジニアリング講演会講演論文集   20th   61-62   2008.1

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Books

  • 見る目が変わる博物館の楽しみ方: 生物・鉱物・考古学を学ぶ (BERET SCIENCE)

    矢野興一, 三河内彰子, 三河内岳, 椎野勇太, 實吉玄貴, 藤原慎一, 折原貴道, 鵜沢美穂子, 皆木宏明, 黒木真理, 松本涼子, 相川稔, 松原始, 佐野勝宏, 鶴見英成, 石井龍太( Role: Joint author ,  第3章―恐竜・古生物:無脊椎動物)

    ベレ出版  2016.10  ( ISBN:9784860644901

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  • 凹凸形の殻に隠された謎: 腕足動物の化石探訪 (フィールドの生物学)

    椎野 勇太( Role: Sole author)

    東海大学出版会  2013.7  ( ISBN:4486018494

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  • 東大古生物学―化石からみる生命史

    佐々木猛智, 伊藤泰弘( Role: Contributor ,  第3章:古生物年表.第4章:機能形態学からバイオメカニクス,進化古生物学へ.第11章:水中へ進出した三葉虫のバイオメカニクス.第12章:腕足動物の摂食戦略に基づく進化形態学.)

    東海大学出版会  2012.10  ( ISBN:4486019652

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  • 化石図鑑 (自然科学ハンドブック)

    相場 大佑, 椎野 勇太, 塚腰 実, 中島 保寿, 喜多 直子

    創元社  2023.2  ( ISBN:4422430491

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  • 古生物学の百科事典

    日本古生物学会( Role: Contributor ,  「腕足動物」「機能形態学に基づく古生態の復元(無脊椎動物)」「機能形態学」)

    丸善出版  2023.2  ( ISBN:4621307584

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  • 〔新版〕岩石・鉱物・化石 DVDつき (小学館の図鑑NEO 18)

    小学館( Role: Contributor ,  監修執筆:原生生物,海綿動物,刺胞動物,外肛動物,腕足動物)

    小学館  2022.6  ( ISBN:4092173180

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  • ‟もしも″絶滅した生物が進化し続けたなら ifの地球生命史 (Graphic voyage)

    土屋 健, 服部, 雅人( Role: Supervisor (editorial) ,  無脊椎動物パート)

    技術評論社  2021.2  ( ISBN:429711920X

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  • 広辞苑を3倍楽しむ その2 (岩波科学ライブラリー)

    岩波書店編集部( Role: Contributor ,  「燕石」)

    岩波書店  2018.2  ( ISBN:4000296701

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  • しんかのお話365日 (理系に育てる基礎のキソ)

    土屋健( Role: Supervisor (editorial))

    技術評論社  2017.7  ( ISBN:477419073X

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  • UMUTオープンラボ : 太陽系から人類へ

    東京大学総合研究博物館( Role: Contributor)

    東京大学総合研究博物館,東京大学出版会 (発売)  2016.11  ( ISBN:4130202650

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  • 化石コレクション10 (朝日ビジュアルシリーズ)

    朝日新聞出版( Role: Contributor ,  腕足動物)

    朝日新聞出版  2010.5  ( ISBN:4023111309

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MISC

  • 212 Image-Based Fluid Dynamics Simulation around Shells Based on the Fossil of Extinct Brachiopods

    SHIINO Yuta, KUWAZURU Osamu, YOSHIKAWA Nobuhiro

    2007 ( 20 )   61 - 62   2008.1

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Presentations

  • 腕足動物ディスキナ類に付着する表在生物から探るホストの生息姿勢復元と生物間相互作用

    椎野勇太, 高階観乃, 石㟢美乃

    日本古生物学会2022年例会(金沢大学,オンライン)  2022.7 

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  • Hydrodynamics of fossil invertebrate skeletons Invited

    Shiino, Y

    RIMS Workshop “Toward an integration of fluids, ecology, and evolution” in Biofluids 2021 (Zoom) 

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  • なぜスナガニはY字形の巣穴をつくるのか?

    石㟢美乃, 小倉誠也, 高橋千絢, 金子真弥, 井村朱里, 椎野勇太

    日本古生物学会2021年年会(岡山理科大学,オンライン) 

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  • 腕足動物Eoplectodontaのアロメトリー

    佐藤洸太, 福田倫太郎, 椎野勇太

    日本古生物学会2021年例会(横浜国立大学,オンライン) 

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  • 太古のバイオメカニクス:化石生物の形態から大進化を探る Invited

    椎野勇太

    日本進化学会第22回オンライン大会シンポジウム「進化の流体力学的側面:バクテリアから恐竜まで」(Zoom) 

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  • 東海沖から採集された遺骸群集中の腕足動物Terebratulina

    佐々木千夏, 椎野勇太, 延原尊美, 伊東祐二, 加藤了也, 池原研

    日本古生物学会2020年例会(東京大学駒場キャンパス,東京) 

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  • 関節構造のない腕足動物ディスキナ類の形態と埋没過程

    増永正大, 椎野勇太

    日本古生物学会2020年例会(東京大学駒場キャンパス,東京) 

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  • スナガニの巣穴から読み解く行動生態と海浜動態への応答様式

    石㟢美乃, 小倉誠也, 高橋千絢, 金子真弥, 井村朱里, 椎野勇太

    日本古生物学会2020年例会(東京大学駒場キャンパス,東京) 

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  • 栄えると滅ぶ腕足動物のジレンマ Invited

    椎野勇太

    日本分類学会連合シンポジウム(国立科学博物館) 

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  • 円錐形ナセラリア類放散虫の仮足による姿勢制御と生態

    一戸凌, 椎野勇太, 栗原敏之, 津田敦

    2019年日本ベントス学会・日本プランクトン学会合同大会(B-nest 静岡市産学交流センター,静岡) 

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  • 泥の中の化石:活動的堆積盆地に特有の埋没過程を探る

    増永正大, 椎野勇太

    日本古生物学会2019年年会(静岡大学,静岡) 

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  • Isotelus 属三葉虫のマウスガード様骨格パーツの知覚系の分布様式とその機能形態学的検討

    平野広大, 鈴木雄太郎, 椎野勇太

    日本古生物学会2019年年会(静岡大学,静岡) 

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  • 大型三葉虫Isotelusに想定された捕食者仮説の実現不可能性

    椎野勇太, 小西雄二, 鈴木雄太郎

    日本古生物学会2019年年会(静岡大学,静岡) 

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    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 津川地域・下部寺泊階野村層のイクノファブリック解析と炭素循環パス・石油根源岩形成

    金子真弥, 栗田裕司, 椎野勇太, 黒川将貴, 横井悟

    令和元年度(2019 年度)石油技術協会春季講演会(国立オリンピック記念青少年総合センター,東京) 

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    Event date: 2019.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 腕足動物Eoplectodontaの3次元形態解析から読み解く成長戦略

    赤坂実優, 椎野勇太

    日本古生物学会2019年例会(神奈川県立生命の星・地球博物館,神奈川) 

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    Event date: 2019.1

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 腕足動物ディスキナ類のもつ環境適応特性

    増永正大, 椎野勇太

    日本古生物学会2019年例会(神奈川県立生命の星・地球博物館,神奈川) 

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    Event date: 2019.1

    Language:Japanese   Presentation type:Poster presentation  

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  • Form and function of fossil brachiopods: Insights into evolutionary morphology Invited

    Shiino, Y

    8th International Brachiopod Congress (The University of Milan, Italy) 

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    Event date: 2018.9

    Language:English   Presentation type:Oral presentation (keynote)  

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  • A hydrodynamic approach to orthid brachiopod Vinlandostrophia ponderosa: Reevaluation of zig-zag function

    Shiino, Y, Tsuchida, T

    8th International Brachiopod Congress (The University of Milan, Italy) 

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    Event date: 2018.9

    Language:English   Presentation type:Poster presentation  

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  • ジグザグを持つ腕足動物Vinlandostrophia ponderosaの適応戦略

    椎野勇太, 土田貴史

    日本古生物学会2018年年会(東北大学,仙台) 

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    Event date: 2018.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • スナガニの行動生態と海浜動態への応答様式

    小倉誠也, 石㟢美乃, 高橋千絢, 金子真弥, 井村朱里, 椎野勇太

    平成30年度(2018年)石油技術協会春季講演会 

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    Event date: 2018.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 表か裏か? CT画像からみた平板形放散虫の形態解析

    椎野勇太, 栗原敏之, 一戸凌, 岸本直子, 吉野隆, 松岡篤

    日本古生物学会2018年例会(愛媛大学,松山) 

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    Event date: 2018.2

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • パイゴープの穴:排泄物高速排泄システム

    池田裕香, 椎野勇太

    日本古生物学会2018年例会(愛媛大学,松山) 

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    Event date: 2018.2

    Language:Japanese   Presentation type:Poster presentation  

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  • Homeostatic spatial behaviour of nassellarian radiolarians: a likely feeding strategy

    Ichinohe, R, Shiino, Y, Kurihara, T

    InterRad XV (Niigata University, Japan) 

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    Event date: 2017.10

    Language:English   Presentation type:Oral presentation (general)  

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  • Head or tail? Morphological analysis of the discoid spumellarian radiolarian Dictyocoryne

    Shiino, Y, Kurihara, T, Ichinohe, R, Kishimoto, N, Yoshino, T, Matsuoka, A

    InterRad XV (Niigata University, Japan) 

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    Event date: 2017.10

    Language:English   Presentation type:Poster presentation  

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  • Hydrodynamic functionalisation of brachiopod shells: insights into evolutionary morphology

    Shiino, Y

    InterRad XV (Niigata University, Japan) 

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    Event date: 2017.10

    Language:English   Presentation type:Oral presentation (general)  

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  • Planktonic capability of discoid spumellarian radiolarians

    Ichinohe, R, Shiino, Y, Kurihara, T, Kishimoto, N

    InterRad XV (Niigata University, Japan) 

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    Event date: 2017.10

    Language:English   Presentation type:Poster presentation  

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  • 平板形態型放散虫Dictyocoryneの浮遊性能

    一戸凌, 椎野勇太, 栗原敏之

    2017年日本プランクトン学会・日本ベントス学会合同大会(滋賀県立大学,滋賀) 

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    Event date: 2017.9

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • A biomechanical approach to understanding the morphological adaptations of fossil spiriferide brachiopods Invited

    Shiino, Y

    The 22nd International Congress of Zoology (Okinawa Convention Center, Okinawa, Japan) 

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    Event date: 2016.11

    Language:English   Presentation type:Oral presentation (invited, special)  

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  • 受動的空間行動から読み解く放散虫ナセラリア類の採餌様式

    一戸凌, 椎野勇太, 栗原敏之

    2016年日本ベントス学会・日本プランクトン学会合同大会(熊本大学,熊本) 

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    Event date: 2016.9

    Language:Japanese   Presentation type:Poster presentation  

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  • 静水環境下における現生放散虫の姿勢と受動的空間行動

    一戸凌, 椎野勇太, 栗原敏之

    日本古生物学会2016年年会(福井県立大学・福井県立恐竜博物館,福井) 

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    Event date: 2016.6

    Language:Japanese   Presentation type:Poster presentation  

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  • 高速遊泳性三葉虫Hypodicranotus striatulusのhypostome:なぜ進化的鍵革新形質になり損ねたのか

    大友翔平, 阿部貴洋, 大森康智, 鈴木雄太郎, 椎野勇太, 桑水流理

    日本古生物学会2016年例会(京都大学,京都) 

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    Event date: 2016.1

    Language:Japanese   Presentation type:Poster presentation  

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  • 機能解析が紐解く腕足動物の適応戦略と大進化メカニズム Invited

    椎野勇太

    日本古生物学会2016年例会シンポジウム「機能形態学から進化形態学へ」(京都大学,京都) 

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    Event date: 2016.1

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

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  • 化石に残された表在生物への理解に向けて

    椎野勇太, 徳田悠希

    日本古生物学会2015年年会(産業技術総合研究所,つくば) 

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    Event date: 2015.6

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  • Die hard under high energy flow conditions: a case of shell functionality in the spiriferinide brachiopod Pachycyrtella

    Shiino, Y, Angiolini, L

    The 7th International Brachiopod Congress (Nanjing Institute of Geology and Palaeontology, Nanjing, China) 

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    Event date: 2015.5

    Language:English   Presentation type:Oral presentation (general)  

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  • How does flow recruit epizoans onto brachiopod shells?

    Shiino, Y, Tokuda, Y

    The 7th International Brachiopod Congress (Nanjing Institute of Geology and Palaeontology, Nanjing, China) 

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    Event date: 2015.5

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  • 進化の袋小路:腕足動物シゾクラニアの体づくりと個生態

    椎野勇太, 鈴木雄太郎, デビッド ハーパー

    日本古生物学会2015年例会(豊橋市自然史博物館,豊橋) 

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    Event date: 2015.1 - 2015.2

    Language:Japanese  

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  • 三葉虫ハイポディクラノタスの遊泳性能と古生態

    椎野勇太, 桑水流理, 鈴木雄太郎, 増田智洋

    日本機械学会第27回バイオエンジニアリング講演会(朱鷺メッセ,新潟) 

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    Event date: 2015.1

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Middle Permian tectono-sedimentary history with biotic reaction of the Southern Kitakami Terrane, northeast Japan

    Shiino, Y

    The 2nd International Symposium on Earth History of Asia (Niigata University, Niigata, Japan) 

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    Event date: 2014.10 - 2014.11

    Language:English   Presentation type:Oral presentation (general)  

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  • 統合的な生体生理システム解明への展望:翼形態型腕足動物を例に

    椎野勇太, ルキア アンジョリーニ

    日本古生物学会2014年年会(九州大学,博多) 

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    Event date: 2014.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 滑らかな殻を持つ大型腕足動物ホロリンカス―示準化石となることへの意義を探る

    椎野勇太, 鈴木雄太郎, 森英樹

    日本古生物学会2014年例会(兵庫県立人と自然の博物館,兵庫) 

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    Event date: 2014.1

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 南部北上山地中部ペルム系の地史:大規模造構運動がもたらした生命への飴と鞭

    椎野勇太, 鈴木雄太郎, 小林文夫

    日本地質学会第120年学術大会(東北大学,仙台) 

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    Event date: 2013.9

    Language:Japanese   Presentation type:Poster presentation  

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  • 遊泳性三葉虫Remopleurides複眼:転輪羅針儀機能発現か?

    増田智洋, 鈴木雄太郎, 大野悟志, 椎野勇太

    日本古生物学会2013年年会(熊本大学,熊本) 

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    Event date: 2013.6

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  • 動かざるもののジレンマ―翼形態種パキシルテラの流体適応

    椎野勇太, ルキア アンジョリーニ

    日本古生物学会2013年年会(熊本大学,熊本) 

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    Event date: 2013.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Hydrodynamic advantages in the free-living spiriferinide brachiopod Pachycyrtella omanensis: Functional insight into adaptation to high energy flow environment

    Angiolini, L, Shiino, Y

    XIII Giornate Di Paleontologia (Università degli Studi di Perugia, Perugia, Italy) 

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    Event date: 2013.5

    Language:English   Presentation type:Oral presentation (general)  

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  • 漂泳生か遊泳性底生か―ハイポディクラノタス問題.

    椎野勇太, 桑水流理, 鈴木雄太郎, 大野悟志, 増田智洋

    日本古生物学会2013年例会(横浜国立大学,神奈川) 

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    Event date: 2013.1

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Exquisite hydrodynamic morphology of the remopleuridid trilobite Hypodicranotus striatulus: Functional insights into the mode of life

    Shiino, Y, Kuwazuru, O, Suzuki, Y, Ono, S, Masuda, C

    The 5th Conference on Trilobites and their relatives (TRILO2012) (Charles University, Prague, Czech Republic) 

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    Event date: 2012.7

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  • 翼形態型腕足動物の採餌戦略と流水環境に対する殻形態の最適性 Invited

    椎野勇太

    第5回evo-devo青年の会「原義の"epigenetics"から進化を理解する」(岡崎コンファレンスセンター,愛知) 

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    Event date: 2012.6

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

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  • かたちの微小変化に伴う機能とその最適性

    椎野勇太, 桑水流理

    日本古生物学会2012年例会(群馬県立自然史博物館,群馬) 

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    Event date: 2012.1

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 遊泳性三葉虫の骨格形態を用いた流体力学的研究

    椎野勇太, 桑水流理, 鈴木雄太郎, 大野悟志

    日本古生物学会2011年年会(金沢大学,金沢) 

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    Event date: 2011.7

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 遊泳性三葉虫の骨格に秘められた流体力学的特性 Invited

    椎野勇太, 桑水流理, 鈴木雄太郎, 大野悟志

    第7回NCPフォーラム(日本機械学会関西支部・機械の強度と形態研究懇話会)(まつや千千,福井) 

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    Event date: 2011.2

    Language:Japanese   Presentation type:Symposium, workshop panel (nominated)  

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  • 機能要求に相応した設計原理を示唆する形態進化仮説:凹凸形態型腕足類の例

    椎野勇太, 山田翔慧, 鈴木雄太郎, 鈴木千里

    日本古生物学会2011年例会(高知大学,高知) 

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    Event date: 2011.1

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  • スピリファー類の「翼」に隠された機能的革新

    椎野勇太, 桑水流理

    日本古生物学会2010年年会(筑波大学,つくば) 

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    Event date: 2010.6

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Functional innovation of spiriferide wing form: Experimental and simulation approaches to generation of passive feeding flow

    Shiino, Y, Kuwazuru, O

    The 6th International Brachiopod Congress (Holmesglen Conference Centre, Melbourne, Australia) 

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    Event date: 2010.2

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  • 海に霞むルビー:ホウズキチョウチンの殻に秘められた色彩特性

    椎野勇太, 北沢公太

    日本古生物学会2010年例会(滋賀県立琵琶湖博物館,滋賀) 

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    Event date: 2010.1

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  • Computational fluid dynamics simulation on spiriferide brachiopod Paraspirifer bownockeri

    Shiino, Y, Kuwazuru, O, Yoshikawa, N

    The 9th North American Paleontological Convention (University of Cincinnati, Ohio, USA) 

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    Event date: 2009.6

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  • 殻形態の機能的最適性-翼形型腕足類スピリファーの受動的採餌水流-

    椎野勇太, 桑水流理, 吉川暢宏

    地球惑星科学連合2009年大会(幕張メッセ,千葉) 

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    Event date: 2009.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • Upper Ordovician lithosomes and faunas on top of the Boda mudmound cores, Dalarna

    Suzuki, Y, Shiino, Y, Bergström, J

    Lundadagarna i Historisk Geologi och paleontology XI (Lund University, Lund, Sweden) 

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    Event date: 2009.3

    Language:English   Presentation type:Oral presentation (general)  

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  • スピリファー類の採餌戦略

    椎野勇太

    日本古生物学会2009年例会(琉球大学,沖縄)  2009.1 

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    Event date: 2009.1

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  • Tubular trace fossil ornamented with bioclasts from the upper Middle Permian Kamiyase Formation

    Seike, K, Shiino, Y, Suzuki, Y

    Ichnia 2008: Second International Congress on Ichnology (Jagiellonian University, Cracow, Poland) 

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    Event date: 2008.9

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  • 腕足類の受動的採餌流を例にした流水実験と流体解析の比較研究

    椎野勇太, 桑水流理, 吉川暢宏

    日本古生物学会2008年年会(東北大学,宮城)  2008.7 

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    Event date: 2008.7

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  • スピリファー腕足類の形態を用いた数値流体解析

    椎野勇太, 桑水流理, 吉川暢宏

    日本古生物学会2008年年会(東北大学,宮城)  2008.7 

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    Event date: 2008.7

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  • スピリファー形態型腕足類の採餌流:数値流体解析を用いて

    椎野勇太, 桑水流理, 吉川暢宏

    地球惑星科学連合2008年大会(幕張メッセ,千葉) 

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    Event date: 2008.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 絶滅生物スピリファーの受動的採餌流形成メカニズムに関する数値流体力学的検討

    椎野勇太, 桑水流理, 吉川暢宏

    日本計算工学会第13回計算工学講演会(仙台市民会館,宮城) 

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    Event date: 2008.5

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 凹凸形態型腕足類の適応戦略

    椎野勇太

    日本古生物学会2008年例会(宇都宮大学,栃木) 

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    Event date: 2008.2

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  • 絶滅腕足類の化石を用いた殻まわりのイメージベース流体解析

    椎野勇太, 桑水流理, 吉川暢宏

    日本機械学会第20回バイオエンジニアリング講演会(芝浦工業大学,東京) 

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    Event date: 2008.1

    Language:Japanese   Presentation type:Oral presentation (general)  

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  • 固着領域の安定性による有関節型腕足類の行動生態:肉茎による運動と機能

    椎野勇太

    2007年日本ベントス学会・日本プランクトン学会合同大会  2007.9 

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    Event date: 2007.9

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  • 有関節型腕足類の姿勢改変能力について~現生テレブラチュラ類を例に~

    椎野勇太, 棚部一成

    日本古生物学会2007年年会(大阪市立大学,大阪) 

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    Event date: 2007.6 - 2007.7

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  • 無関節型腕足類Obolidaeの軟体部情報とその意義

    椎野勇太, 鈴木雄太郎

    日本古生物学会2007年例会(徳島県立博物館,徳島) 

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    Event date: 2007.2

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  • スピリファー類(腕足類)における受動的な採餌流の形成メカニズム

    椎野勇太, 桑水流理, 吉川暢宏

    日本古生物学会2007年例会(徳島県立博物館,徳島) 

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    Event date: 2007.2

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  • 中上部ペルム系上八瀬層から産出するチューブ状生痕化石

    清家弘治, 椎野勇太, 鈴木雄太郎

    日本古生物学会2007年例会(徳島県立博物館,徳島) 

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    Event date: 2007.2

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  • Concavo-convex型腕足類Waagenoconcha imperfecta (Productida) の形態

    椎野勇太

    日本古生物学会2006年例会(京都大学総合博物館,京都) 

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    Event date: 2006.2

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  • 腕足類Waagenoconcha imperfecta (Productida) の生息時に生じる流体力学的特性

    椎野勇太

    日本古生物学会2006年例会(京都大学総合博物館,京都) 

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    Event date: 2006.2

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  • 北上山地上八瀬地域 中部ペルム系の堆積環境の変遷

    椎野勇太, 鈴木雄太郎

    日本古生物学会2004年年会(北九州市立自然史・歴史博物館,福岡) 

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    Event date: 2004.6

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Awards

  • PSJ Academic Award

    2023.6   Palaeontological Society of Japan   Functional and evolutionary morphologic studies of fossil organisms based on fluid mechanics

    Yuta Shiino

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  • The Best Poster Award

    2022.9  

    Yoshino Ishizaki, Yuta Shiino

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  • PSJ Best Article Award

    2022.7   Palaeontological Society of Japan   Death or Living Assemblage? The Middle Permian Discinid Brachiopods in the Kamiyasse Area, Southern Kitakami Mountains, Northeastern Japan

    Masao Masunaga, Yuta Shiino

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  • PSJ Best Article Award

    2021.7   Palaeontological Society of Japan   A morphological analysis of the flat-shaped spumellarian radiolarian Dictyocoryne: morpho-functional insights into planktonic mode of life

    Shiino Y, Kurihara T, Ichinohe R, Kishimoto N, Yoshino T, Matsuoka A

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  • 日本古生物学会第165回例会優秀ポスター賞

    2016.1   日本古生物学会   高速遊泳性三葉虫Hypodicranotus striatulusのhypostome:なぜ進化的鍵革新形質になり損ねたのか

    大友翔平・阿部貴洋・大森康智・鈴木雄太郎・椎野勇太・桑水流理

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  • 第2013年年会優秀ポスター賞

    2013.6   日本古生物学会   遊泳性三葉虫Remopleurides複眼:転輪羅針儀機能発現か?

    増田智洋, 鈴木雄太郎, 大野悟志, 椎野勇太

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  • Excellent Poster Award

    2011.1   Paleontological Society of Japan   One likely evolution scenario of productide morphology

    Shiino Y, Yamada S, Suzuki Y, Suzuki C

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  • The Award of the Alwyn Williams

    2010.2   The 6th International Brachiopod Congress  

    Shiino Y

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  • PSJ Best Article Award

    2008.7   Palaeontological Society of Japan   Articulatory and musculatory systems in a Permian concavo-convex brachiopod Waagenoconcha imperfecta Prendergast, 1935 (Productida, Brachiopoda)

    Shiino Y, Suzuki Y

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Research Projects

  • パレオ・バイオメカニクスから読み解く腕足動物の形態進化と多様性

    Grant number:22K03795

    2022.4 - 2025.3

    System name:科学研究費助成事業 基盤研究(C)

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

    椎野 勇太

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    Grant amount:\4160000 ( Direct Cost: \3200000 、 Indirect Cost:\960000 )

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  • 化石複眼の構造-視覚機能の成熟プロセスの解明:視覚特性の進化多様性

    Grant number:21K03736

    2021.4 - 2024.3

    System name:科学研究費助成事業 基盤研究(C)

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

    鈴木 雄太郎, 生田 領野, 椎野 勇太

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    初期古生代に高い種多様化を達成した絶滅節足動物・三葉虫類において、複眼視覚特性の観点から多様化の生体生理的な理由を見出すことを目的としている。古生態的に大きく異なる四種を選定し、これらの化石複眼について、高精度のマイクロ形態解析と数理解析によって、視野特性を表す構造的特徴を解析している.
    数理解析について改良を行い、複眼の表面形状を近似する際に用いる関数をスプライン関数を用いてより信憑性の高い結果を得られている。選定種2種については、マイクロ形態解析と数理解析がほぼ終了し、他1種は1個体の解析を終了した。
    その2種のうち、底性種E. laticaudaは、330°の超広角の水平視野範囲において周囲の海底面上を広く形態視するアキュートゾーンを持ち、さらに動物体前・後方の動体視領域を左右の視野範囲を重複してコントラスト感度を高める特性であったことが明らかとなった。一方の遠洋遊泳性種P. galicaは、動物体下方の視野範囲が最大90°と広いことが明らかとなり、さらに動物体前下方には左右視野が重複するスポット状のアキュートゾーンを備えていたことが明らかとなった。予察的に得た底性定住性種S.oviformisの視覚特性は、比較的狭い140°の水平視野範囲で周囲海底面を形態視する特性が示唆された。
    明らかとなった視覚特性は、各種の古生態を色濃く反映した種固有化が著しく高いものであったが、共通点も見出された。動物体の上側方の方位にはブライトゾーンが見出される。高い空間分解能と感度を兼ね揃えるブライトゾーンは、現生節足動物のアナロジーにもとづくと索敵効果が高いことが想定される。三葉虫の視覚特性の進化において、索敵能力の向上の後に視覚特性の種固有化が促進されたことが伺える。

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  • 氷期に暖流域深海底で何が起きていたか -底生動物群集の変化と環境動態の解明

    Grant number:20K04147

    2020.4 - 2023.3

    System name:科学研究費助成事業 基盤研究(C)

    Research category:基盤研究(C)

    Awarding organization:日本学術振興会

    延原 尊美, 徳田 悠希, 池原 研, 椎野 勇太, 石村 豊穂

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    Grant amount:\4290000 ( Direct Cost: \3300000 、 Indirect Cost:\990000 )

    昨年度に引き続き、東海沖の無脊椎動物遺骸試料について分類学的な再検討を進め、伊豆諸島周辺海域より、新たにシラスナガイ類二枚貝2新種を認めた。昨年度とあわせるとシラスナガイ類だけでも伊豆諸島周辺海域には現生種、半化石種を含め4新種が存在したことになり、伊豆諸島周辺の火山弧が提供する深海粗粒底質が、重要な種分化の場であることが支持された。本年度新たに認められた2新種について殻形質を定量的に検討した結果、一方は本州暖流域の浅海に生息するオリイレシラスナガイに酷似するが、もう一方は本州東北太平洋側の寒冷水域の深海に生息するミノシラスナガイに酷似することが判明した。このことから、伊豆諸島周辺海域で種分化を遂げた種群の起源となる祖先種の進入ルートは、南方からの暖流経由、北方からの寒流経由の双方があったことがわかる。なお、ミノシラスナガイ似の新種については、幼貝から若貝時まではミノシラスナガイと区別困難であるが、老成すると殻形態の変異が著しいことから、火山弧周辺の粗粒底質に適応した生態型の可能性もある。
    今回認められた伊豆諸島周辺海域のシラスナガイ類2新種については、殻の放射性炭素同位体年代が予察的に得られている。暖流経由と思われるオリイレシラスナガイ似新種はAD.703ー881年の歴史時代に、寒流経由と思われるミノシラスナガイ似新種は4.6ー4.2万年前の氷期に相当する年代が得られている。なお、後者については同様の年代値を示す冷水サンゴも得られている。この冷水サンゴはヨーロッパやニュージーランドにおいて深海サンゴ礁を形成する種であるが、伊豆諸島周辺にはそれらのサンゴ骨格が大量に集積している。これらのことから、寒冷種起源の種の分化に関しては、氷期における水塊構造の変化が関連しており、その際に伊豆諸島周辺の深海生物相にも大きな変化があったことが予測された。

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  • Morphological function of zig-zag commissure in orthide brachiopods: biomechanical insights into adaptation and evolution

    Grant number:16K17827

    2016.4 - 2019.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Young Scientists (B)

    Research category:Grant-in-Aid for Young Scientists (B)

    Awarding organization:Japan Society for the Promotion of Science

    Shiino Yuta

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    Grant amount:\2600000 ( Direct Cost: \2000000 、 Indirect Cost:\600000 )

    It is known that orthide brachiopods have diversified through the Ordovician period as the dominant players in the Great Ordovician Biodiversification Event. Because a capability of filter feeding has not previously been discussed in this group, I demonstrated flow experiments using platystrophiide orthid models, one with and one without a zig-zag commissure.
    Regardless of the presence or absence of the zig-zag commissure, the models generated vortices inside them, similar to those of spiriferide brachiopods. The velocity of vortices in the zig-zag model was slower than that in the smooth model, suggesting a fluid suppressive function of zig-zag commissure. Such a morphological function may result in a robust adaptation in a wide variety of fluidic environments.

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  • High-resolution mapping of benthos ecosystems on an active margin setting -Biodivesity formed by plate tectonic movements

    Grant number:26400503

    2014.4 - 2018.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)

    Research category:Grant-in-Aid for Scientific Research (C)

    Awarding organization:Japan Society for the Promotion of Science

    Nobuhara Takami, IKEHARA Ken

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    Grant amount:\4680000 ( Direct Cost: \3600000 、 Indirect Cost:\1080000 )

    The region off Tokai district, central Japan, is a representative active margin because of the oblique subduction of Philippine Sea Plate and collision of the Izu-Ogasawara volcanic arc, which forms various submarine topography. This study analyzed dead shells and skeletons in grab samples by Geological Survey of Japan from 462 stations covering all the area. We identified 296 bivalve, 33 brachiopod, and 67 coral species, and made clear that the topographic variation controlled the taxonomic composition and provides niches for phylogenetically close species. High-species diversity in bathyal depths is recognized on a knoll of the Izu volcanic islands and near the Takamatsu submarine canyon off Enshu-nada sea, which are associated with much cold-water coral skeletons. AMS 14C ages of the shells and skeletons corresponds to the Last Glacial period. These suggests that topographic variation under climatic change is an important key to form species diversity of deep-sea benthos.

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  • Biomechanics of extinct organisms; exploring ancient functionalities

    Grant number:25630047

    2013.4 - 2016.3

    System name:Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research

    Research category:Grant-in-Aid for Challenging Exploratory Research

    Awarding organization:Japan Society for the Promotion of Science

    Shiino Yuta

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    Authorship:Principal investigator  Grant type:Competitive

    Grant amount:\3900000 ( Direct Cost: \3000000 、 Indirect Cost:\900000 )

    In contrast to the modern organisms, many fossil organisms have a strange form that evokes the unknown morphological functionality. Of these, spiriferide brachiopods are characterized by having the wing appearance, and those shell form have a role to generate spiral feeding flows inside. Using the model of spiriferides, flow experiments and computational fluid dynamics simulations were demonstrated to understand how the shell forms have been functional and optimised under selected flow conditions. The hydrodynamic approaches revealed that the original life posture of Pachycyrtella, one of spiriferide genera, was the most instable against the ambient flows, while was the most functional to generate stable spiral flows inside the shell. Changes of shell opening degree may enhance the functionality of such a “passive vortex generator”, thereby resulting in a robust adaptation to an agitated flow condition.

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  • バイオメカニクスに基づく凹凸形態型腕足動物の初期進化

    Grant number:24840018

    2012.8 - 2014.3

    System name:科学研究費助成事業 研究活動スタート支援

    Research category:研究活動スタート支援

    Awarding organization:日本学術振興会

    椎野 勇太

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    Grant amount:\2990000 ( Direct Cost: \2300000 、 Indirect Cost:\690000 )

    古生代の海洋底で大繁栄を遂げた無脊椎動物の腕足動物は,周辺に生じた水流に身を任せて受動的に殻の内側へ水を引き込み,採餌や呼吸を行っていた.中でも凹凸形態型腕足動物プロダクタス類は,凸状に膨らんだ腹殻を底面に向けて海底に寝そべり,あらゆる方向から水を循環させることができる適応形態であることがわかっている.受動的な水流形成のためには,堆積物上に反り立つ殻前縁部の開口部と,底面付近に位置する耳開口部の間に生じる圧力差に依存する.まるで煙突様の機能によって生み出されるこの圧力差は,海底に寝そべる姿勢によって大きく変化してしまう.したがって,前縁部と耳を形づくる殻の縁辺部は,個体まわりの微妙な環境に応じて機能不全を起こさないような流体力学的特性を維持させなくてはならない.どのような経緯でこの機能性が誕生したのかを明らかにするために,凹凸形態種の祖先にあたるストロフォメナ類レプターナの形と流れの関係を流体力学的に検討した.
    流水装置と中空殻模型を用いた流水実験の結果,レプターナの殻形態は,プロダクタス類で再現された受動的水流の形成機能と同様の役割を備えていたことがわかった.しかし流速が高くなると,堆積物上に反り立つような前縁部が大きな抵抗を生み,殻模型がひっくり返ってしまった.姿勢がひっくり返った凹凸形態種は,縁辺部が堆積物に突き刺さり,窒息して死亡するだろう.つまりレプターナの殻形態は,生息姿勢が不安定になってしまうジレンマを抱えながら,煙突様の水流形成機能を備えるように進化したと考えられる.
    本研究によって,絶滅生物の初期進化を「形の機能化」から説明する兆しが見えてきた.機能化と多様性の関係をより深く理解するためには,殻の形づくりに秘められた可塑性が鍵を握るかもしれない.さらなる標本調査や形態解析の進展が必要である.

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  • 翼形態型腕足類の殻形態に見られる機能的最適性:受動的採餌流の形成能力とその進化

    Grant number:10J07546

    2010 - 2013.3

    System name:科学研究費助成事業 特別研究員奨励費

    Research category:特別研究員奨励費

    Awarding organization:日本学術振興会

    椎野 勇太

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    Grant amount:\2800000 ( Direct Cost: \2800000 )

    古生代中期に大繁栄した翼形態型腕足動物スピリファー類は,殻の形態機能によって自動的に殻内外の水を交換できる「ろ過機能体」であった.具体的には,翼形態種の殻正中線上に見られる湾曲部が,自動的な流入・流出を助ける圧力差を殻の開口部に生み出し,殻内側でらせん状渦流を発生させる形態機能を持つ.これによって,翼形態種が殻内側に持っている螺旋状の採餌器官を用いて効果的な採餌を行う適応形態であった.一方,「燕石」の所以でもある側方に伸びた翼様形態については,殻内側で生じる渦流に関与していることが予想されつつも,翼形態まわりに生じる乱流現象によって,具体的な機能や効果は不明であった.この問題を解決するために,翼の発達したCyrtospirifer cf. verneuiliを用いて流水実験および流体解析の比較研究を行い,その上で流体解析のデータを慎重に検討した.その結果,翼を持つスピリファーの受動的採餌水流は,翼形質の開口部付近で流れが剥離し,開口部と殻の下流側に生じる大きな剥離渦が強く影響していることがわかった.そしてこの剥離渦が開口部付近の流れを断続的に引きずるような挙動となり,殻の内側で渦が形成された.これら一連の研究結果を踏まえると,これまでに扱ってきた短翼形のスピリファー類は,水の流入と渦流の形成をサルカスだけで担う一方,長翼形のスピリファー類はサルカスの機能によって水を流入させ,翼様形質の効果によって渦流を形成していたと結論付けられる.つまり,前者は特定の安定した環境で効果を発揮し,後者は形質の持つ機能を役割分担(リスク軽減)をすることで幅広い環境へと適応することができたかもしれない.翼の未発達な種に比べ,様々な環境から長い翼を持つ種が産出することが知られており,形態機能の"ロバストさ"が幅広い適応環境を生み出していたことが強く示唆される.

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  • 絶滅腕足類の殻形態:その流体力学的効果による受動的採餌流の形成機構と採餌効率

    Grant number:08J10796

    2008 - 2009

    System name:科学研究費助成事業 特別研究員奨励費

    Research category:特別研究員奨励費

    Awarding organization:日本学術振興会

    椎野 勇太

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    Grant amount:\1200000 ( Direct Cost: \1200000 )

    今年度の目標は,絶滅した二枚貝様の底生無脊椎動物腕足類スピリファー類における流体力学的特性を,受動的な採餌水流の形成メカニズムの点から明らかにし,鍵となる殻の形質の最適性を検討することであった.初年度の研究によって,スピリファー類が受動的採餌水流を効果的に発生させるには,殻の正中線上にある湾曲部サルカスが重要な役割を果たしていることがわかっている.したがって,このサルカスの発達具合が微妙に異なれば,流入の強さも異なる可能性が考えられる.そこで,サルカスがどのような制約条件のもと最適化されていたのか検討するために,サルカスの発達具合を変化させたモデルを用いて流体解析を行った.サルカスを完全に欠如させたモデルで解析を行った結果,流入流出関係が逆転するだけでなく,殻内側で生じるはずの渦流が効果的に形成されることはなかった.また.サルカスの深さを3段階に変化させたモデルを用いて解析を行った結果,開口部における圧力差は,サルカスが深いほど大きくなることが明らかとなった.一方,殻内側の理想的流体挙動である渦状旋回流は,3段階のサルカス全てのモデルで形成されることがわかった.しかしながら深いサルカスおよび浅いサルカスとしたモデルにおける渦状旋回流の流速は,周辺流速の違いに応じて不安定であった.これら一連の結果は,より深いサルカスであれば,高い圧力差を発生しやすい上,力強い流入を可能にすることを意味する.その一方で力強い流入は,殻内側で受動的な採餌を行う上で不都合であった可能性が高い.さらに深いサルカスは,自然環境下で見られるような周辺水流の速度変化に対して過敏に機能するため,受動的採餌を行う上では不利であったと考えられる.結果的に,スピリファー類のサルカス形態は,受動的採餌を行うために,流水環境に対する機能と軟体部の最適濾過条件の関係によって制約を受けている可能性が示唆される.

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Teaching Experience (researchmap)

Teaching Experience

  • 地球環境の多様性と歴史

    2023
    Institution name:新潟大学

  • 海外フィールド体験実習

    2023
    Institution name:新潟大学

  • 海外フィールド科学実習B

    2023
    Institution name:新潟大学

  • フィールド産業インターンシップ

    2023
    Institution name:新潟大学

  • 地球環境科学特論

    2023
    Institution name:新潟大学

  • 海外フィールド科学実習A

    2023
    Institution name:新潟大学

  • 地球環境フィールド科学演習

    2023
    Institution name:新潟大学

  • 理学基礎演習

    2022
    Institution name:新潟大学

  • 地質フィールド実習

    2022
    Institution name:新潟大学

  • 卒業論文

    2021
    Institution name:新潟大学

  • 野外実習B

    2021
    Institution name:新潟大学

  • 野外実習I

    2021
    Institution name:新潟大学

  • 課題研究(地質科学)

    2020
    Institution name:新潟大学

  • 論文講読演習

    2020
    Institution name:新潟大学

  • 卒業論文Ⅰ

    2020
    Institution name:新潟大学

  • Earth Science todayⅡ

    2020
    Institution name:新潟大学

  • 地球科学特別講義I

    2020
    Institution name:新潟大学

  • 卒業論文Ⅱ

    2020
    Institution name:新潟大学

  • 野外実習A

    2019
    Institution name:新潟大学

  • 地質調査法実習III

    2019
    Institution name:新潟大学

  • 古生物学B

    2018
    Institution name:新潟大学

  • 地質調査法I

    2018
    Institution name:新潟大学

  • 地質調査法実習II

    2018
    Institution name:新潟大学

  • 地質調査法実習I

    2018
    Institution name:新潟大学

  • 地層・古生物学入門

    2018
    Institution name:新潟大学

  • 地質調査法II

    2018
    Institution name:新潟大学

  • 理学スタディ・スキルズ

    2018
    -
    2020
    Institution name:新潟大学

  • 地学基礎B

    2017
    Institution name:新潟大学

  • 地質学入門b

    2017
    Institution name:新潟大学

  • 課題研究

    2017
    Institution name:新潟大学

  • 地学基礎実習a

    2017
    Institution name:新潟大学

  • 専門力アクティブ・ラーニング

    2017
    -
    2021
    Institution name:新潟大学

  • 地球科学特別講義II

    2017
    Institution name:新潟大学

  • 地学基礎実習b

    2017
    Institution name:新潟大学

  • フィールド体験実習

    2017
    Institution name:新潟大学

  • 地史学原理

    2017
    Institution name:新潟大学

  • 古生物学A

    2016
    Institution name:新潟大学

  • 地史学A

    2016
    Institution name:新潟大学

  • コミュニケーション実習

    2016
    -
    2021
    Institution name:新潟大学

  • 野外実習II

    2016
    -
    2017
    Institution name:新潟大学

  • 自然科学総論Ⅴ

    2016
    Institution name:新潟大学

  • 古生物学実験

    2015
    Institution name:新潟大学

  • セミナー

    2015
    Institution name:新潟大学

  • 課題研究(地質科学科)

    2015
    -
    2016
    Institution name:新潟大学

  • 海洋生物学実験

    2014
    Institution name:新潟大学

  • 進化形態学

    2014
    Institution name:新潟大学

  • 野外実習I

    2014
    -
    2021
    Institution name:新潟大学

  • 野外実習III

    2014
    -
    2018
    Institution name:新潟大学

  • 古無脊椎動物学実験

    2014
    -
    2016
    Institution name:新潟大学

  • 野外実習基礎

    2014
    -
    2016
    Institution name:新潟大学

▶ display all

 

Social Activities

  • 泳ぐ三葉虫―化石から生態を探る

    Role(s): Lecturer

    朝日カルチャーセンター中之島教室  朝日カルチャーオンライン講座  2020.9

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  • 二枚貝じゃない?スローライフな腕足動物の謎.

    Role(s): Lecturer

    葛西臨海水族園  高校生・大学生向け講座「海の学び舎や」「生き物は見た目じゃない-じゃない生物-」  2019.11

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  • やるきの無さが成功の秘訣!?腕足動物の無気力で巧みな機能戦略

    Role(s): Lecturer

    いきもにあ2017  いきもにあ2017  2017.11

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  • 絶滅生物の“かたち”に隠された謎に迫る

    Role(s): Lecturer

    地球惑星科学NYS  地球惑星科学NYS2015  2015.10

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  • 三葉虫の機能美―収集と研究の立場から

    Role(s): Panelist, Lecturer

    岐阜県立博物館  三葉虫の機能美―収集と研究の立場から  2015.8

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  • 化石が紐解く地球生命史

    Role(s): Lecturer

    新潟県立高田高校  SSHミラクルサイエンスI  2014.7

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  • 腕足動物のアーキテクチャ―消極的な生存戦略を実現した巧みな機能デザイン

    Role(s): Lecturer

    東京大学総合研究博物館小石川分館  建築博物教室第1回公開ギャラリーセミナー  2014.3

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  • 古生物の教室―北上山地の生い立ちを探る

    Role(s): Lecturer

    東京大学総合研究博物館  東大教室@大槌  2013.10

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  • 古生物の教室

    Role(s): Lecturer

    インターメディアテク(IMT)  IMTカレッジ「東大教室2013夏」  2013.7

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  • 絶滅腕足動物―機能を追及した奇妙なデザイン

    Role(s): Lecturer

    杉並区立科学館  杉並区立科学館自然科学ワークショップ「生物の形を読み解く」  2013.2

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  • 形態進化に魅入られて~"いち古生物研究者"への道のり~

    Role(s): Lecturer

    静岡大学  未来の科学者養成講座・キャリアデザインワークショップ  2012.9

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  • 流体力学的アプローチから探る絶滅生物の形態進化

    Role(s): Lecturer

    ソフトウェアクレイドル  ソフトウェアクレイドル・ユーザーカンファレンス2011(セルリアンタワー,東京)  2011.10

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  • 地質の日・記念イベント「化石からみる地球のなり立ちのお話しと化石採集」

    Role(s): Lecturer

    石と賢治のミュージアム  地質の日・記念イベント  2011.5

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  • 地質の日・記念イベント「化石のお話と化石採り」

    Role(s): Lecturer

    石と賢治のミュージアム  地質の日・記念イベント  2010.5

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