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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Pervushovisaurus ： ウィキペディア英語版 Pervushovisaurus ''Pervushovisaurus'' is a genus of platypterygiine ichthyosaur from the Late Cretaceous (Cenomanian, 94-100 Ma) of the Saratov region in western Russia. It was originally described as a subgenus of ''Platypterygius'',〔Arkhangel’sky, M. S., 1998, On the Ichthyosaurian Genus Platypterygius: Palaeontological Journal, v. 32, n. 6, p. 611-615.〕 but later work showed that it was distinct from the type species of ''Platypterygius'', ''P. platydactylus'', to be elevated to full generic rank.〔Valentin Fischer, Maxim S. Arkhangelsky, Darren Naish, Ilya M. Stenshin, Gleb N. Uspensky and Pascal Godefroit (2014) Simbirskiasaurus and Pervushovisaurus reassessed: implications for the taxonomy and cranial osteology of Cretaceous platypterygiine ichthyosaurs. Zoological Journal of the Linnean Society 171(4): 822–841. http://onlinelibrary.wiley.com/doi/10.1111/zoj.12158/abstract〕 The type species of ''Pervushovisaurus'', ''P. bannovkensis'', is known only from the holotype, SSU 104a/24, a partial skull.〔Storrs, G. W., M. S. Arkhangel'skii and V. M. Efimov. 2000. Mesozoic marine reptiles of Russia and other former Soviet republics. pages 187-210 In Benton, M. J., M. A. Shiskin, D. M. Unwin and E. N. Kurochkin, (eds.), The Age of Dinosaurs in Russia and Mongolia, Cambridge University Press, Cambridge.〕 ==Description== Fischer et al. give the diagnosis of ''Pervushovisaurus'' as follows (p. 829): "Platypterygiine ophthalmosaurid characterized by the following autapomorphies: presence of foramina along the ventral premaxillary–maxillary suture; presence of a semi-oval foramen on the lateral surface of the premaxilla, anteroventral to the external naris; presence of lateral ridges on the maxilla; presence of wide supranarial ‘wing’ of the nasal (a similar structure, although much smaller, is present in ''Platypterygius australis'' and ''Acamptonectes densus''; see Kear, 2005; Fischer ''et al''., 2012, respectively); robust splenial markedly protruding from the external surface of the mandible. ''Pervushovisaurus bannovkensis'' is also characterized by the following unique combination of features: secondarily closed naris surrounded by foramina (in ''Platypterygius sachicarum'' and ''Platypterygius australis'' (see Páramo, 1997 and Kear, 2005, respectively), and in ''Simbirskiasaurus birjukovi'', although the ‘anterior’naris is still present in this taxon (Maisch & Matzke 2000; this work) ); elongated anterior process of the maxilla, reaching anteriorly the level of the nasal (in ''Aegirosaurus leptospondylus'' (see Bardet & Fernández, 2000) and ''Sveltonectes insolitus'' (see Fischer ''et al''., 2011b) ); root cementum forming prominent 90° angles (as in ''Platypterygius campylodon''; see Fischer ''et al''., 2014b)."〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Pervushovisaurus」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.