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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 Neotrigonia ： ウィキペディア英語版 Neotrigonia ''Neotrigonia'' is a genus of living saltwater clams, marine bivalve mollusks in the family Trigoniidae, which otherwise consists only of fossil genera. For a long time the entire family was thought to be long extinct, but a living species that is now placed in this genus was discovered in 1802. At that time it was assigned to the fossil genus ''Trigonia''. Currently, according to WoRMS, 8 species in this genus are recognized. ==Discovery of the genus== Until the beginning of the 19th century, no living species in this superfamily had ever been discovered, although numerous fossil species were known. The superfamily was well known as fossils from the Devonian to the Cretaceous Period. In 1802, however, François Péron discovered a living species in waters off the coast of Tasmania. In 1804, Lamarck named that species ''Trigonia margaritacea'', and Cossmann renamed the genus ''Neotrigonia'' in 1912. Today, eight living species are known to exist, all of which are found off the coast of Australia and Tasmania. ''Neotrigonia'' probably evolved from ''Eotrigonia'' (Eocene to Miocene) during the Miocene epoch.〔 Francis, A.O. 2000. The Palaeobiology of the European Jurassic Trigoniidae. Ph.D. thesis, University of Birmingham, 323pp.〕 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「Neotrigonia」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.