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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 Argentodites ： ウィキペディア英語版 Argentodites ''Argentodites'' is a possible multituberculate mammal from the Cretaceous of Argentina. The single species, ''Argentodites coloniensis'', is known from a single blade-like fourth lower premolar (p4) from the La Colonia Formation, which is mostly or entirely Maastrichtian (latest Cretaceous) in age. The p4 is 4.15 mm long and bears eight cusps on its upper margin and long associated ridges on both sides. The enamel consists of prisms that are completely or partly surrounded by a sheath and that are on average 6.57 μm apart. Zofia Kielan-Jaworowska, who described and named the fossil in 2007, regarded it as a multituberculate, perhaps a cimolodontan—and thus, a member of a mostly Laurasian (northern) group and an immigrant to Argentina from North America—on the basis of the shape of the tooth and features of its enamel. In 2009, however, two teams argued that ''Argentodites'' may in fact be close to or identical with ''Ferugliotherium'', a member of the small Gondwanan (southern) group Gondwanatheria; although their relationships are disputed, gondwanatheres may themselves be multituberculates. ==Discovery and context== ''Argentodites'' is known from a single premolar tooth, MPEF 604, in the collections of the Museo Paleontológico "Egidio Feruglio" in Trelew, Argentina.〔Kielan-Jaworowska et al., 2007, pp. 257–258〕 It is from the middle part of the La Colonia Formation of Chubut Province, Argentina, which is Late Cretaceous (Maastrichtian and perhaps partly Campanian) in age.〔Kielan-Jaworowska et al., 2007, p. 258〕 The premolar was described in 2007 by Zofia Kielan-Jaworowska and colleagues as a new genus and species, ''Argentodites coloniensis''. The generic name, ''Argentodites'', combines "Argentina" with the Ancient Greek ''hodites'' "traveler", in reference to the animal's presumed migration from North America to Argentina, and the specific name, ''coloniensis'', refers to the La Colonia Formation.〔Kielan-Jaworowska et al., 2007, p. 257〕 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「Argentodites」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.