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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 Aletoceras ： ウィキペディア英語版 Aletoceras ''Aletoceras'' is an Oncocerida nautiloid from the middle Devonian of North America included in the family Brevicoceratidae. The shell is a depressed brevicone, that is to say short. Sutures are generally straight, the siphuncle ventral, empty. The peristome (aperture rim) has a broad hyponomic sinus -for the hydrojet funnel, ventrolateral projections, dorsolateral sinuses - possibly for the eyes, and probably a mid dorsal sinus. In general form,''Aletoceras'' resembles ''Brevicoceras'' and ''Eleusoceras'', both also from the middle Devonian of North America. The orientation of ''Aletoceras'' and others like it may have been vertical with the aperture facing down . ==References== * W.C. Sweet 1964. Nautiloidea - Oncocerida, Treatise on Invertebrate Paleontology, Part C. University of Kansas Press, Lawrence, Ka. * (''Aletoceras'' ) in Fossilworks, 1/5/15 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「Aletoceras」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.