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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 Alcidedorbignya ： ウィキペディア英語版 Alcidedorbignya ''Alcidedorbignya'' is an extinct pantodont mammal known from the Early Paleocene (Tiupampan SALMA, ) Santa Lucia Formation (, paleocoordinates )〔. Retrieved July 2013.〕 at Tiupampa near Mizque, Cochabamba, Bolivia.〔 Following a naming convention established by pioneering Argentine palaeontologist Florentino Ameghino (i.e. combining the first name and surname of a prominent scientist), the genus name honours French naturalist Alcide d'Orbigny. ''Alcidedorbignya'' is one of the oldest and most primitive of the pantodonts and the only pantodont genus known from South America.〔 Not only have some scientists〔E.g., disputed the Cretaceous age first proposed by .〕 questioned the age of the type locality, instead advocating an Asian origin for the pantodonts, ''Alcidedorbignya'''s bare existence obscures the origins of the already enigmatic pantodonts.〔 Taxonomic similarities indicate that there was a mammalian interchange between North and South America during the early Paleocene,〔See First American land bridge〕 and the North American pantodont ''Pantolambda'' is a potential descendant of ''Alcidedorbignya''. ''Alciddedorbignya'' is known from several specimens of upper and lower dentitions, including juveniles. P3–4 have V-shaped ectolophs (ridges on the crowns), indicating it was a primitive pantodont. Other molar characteristics makes it unique among pantodonts. On the molars, the paracone and metacone are separated and not connate as in ''Bemalamdba'' and ''Harpyodus''. As in these two genera, there is neither a mesostyle on M1–2 nor a strongly V-shaped centocrista as in eupantodonts (all later pantodonts). It is still unclear which the primitive condition is in pantodont upper dentition, and the position of ''Alcidedorbignya'' near the base of the clade remain unresolved.〔 ==Notes== 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「Alcidedorbignya」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.