Výsledky vyhledávání - "KENSHU SHIMADA"

Akademický článek

The first recognition of the enigmatic fossil shark genus Megalolamna (Lamniformes, Otodontidae) from the lower Miocene of Europe and M. serotinus (Probst, 1879) as the newly designated type species for the genus

Autor: Jürgen Pollerspöck, Kenshu Shimada

Publikováno v: Zitteliana, Vol 98, Iss , Pp 1-9 (2024)

Megalolamna is an elusive extinct shark genus (Lamniformes: Otodontidae) previously known from the upper Oligocene–Miocene of the USA, Colombia, Ecuador, Peru, and Japan. Here, we document the first occurrence of Megalolamna from Miocene marine dep

Externí odkaz: https://doaj.org/article/c813306961d34a158f0136bea7123ed5

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Akademický článek

Cautionary tales on the use of proxies to estimate body size and form of extinct animals

Autor: Joel H. Gayford, Russell K. Engelman, Phillip C. Sternes, Wayne M. Itano, Mohamad Bazzi, Alberto Collareta, Rodolfo Salas‐Gismondi, Kenshu Shimada

Publikováno v: Ecology and Evolution, Vol 14, Iss 9, Pp n/a-n/a (2024)

Abstract Body size is of fundamental importance to our understanding of extinct organisms. Physiology, ecology and life history are all strongly influenced by body size and shape, which ultimately determine how a species interacts with its environmen

Externí odkaz: https://doaj.org/article/702ffcf5f9244e64a1ef9e66db86ad9a

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Akademický článek

Skeletal convergence in thunniform sharks, ichthyosaurs, whales, and tunas, and its possible ecological links through the marine ecosystem evolution

Autor: Ryosuke Motani, Kenshu Shimada

Publikováno v: Scientific Reports, Vol 13, Iss 1, Pp 1-10 (2023)

Abstract Tunas, lamnid sharks, modern whales, and derived ichthyosaurs converged on the thunniform body plan, with a fusiform body, lunate caudal fin, compressed peduncle, and peduncle joint. This evolutionary convergence has been studied for a long

Externí odkaz: https://doaj.org/article/01bd07b246dc4d968e9639f6684c3c21

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Akademický článek

Trophic position of Otodus megalodon and great white sharks through time revealed by zinc isotopes

Autor: Jeremy McCormack, Michael L. Griffiths, Sora L. Kim, Kenshu Shimada, Molly Karnes, Harry Maisch, Sarah Pederzani, Nicolas Bourgon, Klervia Jaouen, Martin A. Becker, Niels Jöns, Guy Sisma-Ventura, Nicolas Straube, Jürgen Pollerspöck, Jean-Jacques Hublin, Robert A. Eagle, Thomas Tütken

Publikováno v: Nature Communications, Vol 13, Iss 1, Pp 1-10 (2022)

Here the authors demonstrate the use of zinc isotopes (δ66Zn) to geochemically assess trophic levels in extant and extinct sharks. They show that the Neogene megatooth shark (Otodus megalodon) and the great white shark (Carcharodon carcharias) occup

Externí odkaz: https://doaj.org/article/f88ad67ad5cf43d1acb974e5b5308b35

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Akademický článek

A previously overlooked, highly diverse early Pleistocene elasmobranch assemblage from southern Taiwan

Autor: Chia-Yen Lin, Chien-Hsiang Lin, Kenshu Shimada

Publikováno v: PeerJ, Vol 10, p e14190 (2022)

The Niubu fossil locality in Chiayi County, southern Taiwan is best known for its rich early Pleistocene marine fossils that provide insights into the poorly understood past diversity in the area. The elasmobranch teeth at this locality have been col

Externí odkaz: https://doaj.org/article/d2b316f55d924f64b2032239e2586f17

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Akademický článek

The oldest fossil record of the megamouth shark from the late Eocene of Denmark and comments on the enigmatic megachasmid origin

Autor: Kenshu Shimada, David J. Ward

Publikováno v: Acta Palaeontologica Polonica, Vol 61, Iss 4, Pp 839-845 (2016)

The megamouth shark (Lamniformes: Megachasmidae) has sporadic occurrences both in the present-day oceans and in the fossil record. In this paper, we describe a new megachasmid, Megachasma alisonae sp. nov., on the basis of a morphologically distinc

Externí odkaz: https://doaj.org/article/1ea8323e60884b2e83c5d152aefaa324

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