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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 Otoitidae ： ウィキペディア英語版 Otoitidae Otoidtidae: stephanoceratacean ammonitina from the early Middle Jurassic that begin as cadicones but become more planualte with age; derived from the Hammitoceratidae (Hildocerataceae), probably through ''Erycites'' by way of ''Abbasites''. Shells begin barrel shaped with depressed whorls, broad outer rims, and deep, crater-like umbilici—cadiconic—but become compressed, with the out rims becoming bluntly rounded—planulate. Ribbing is common; may be heavy and tuberculate on the umbilical shoulders and may divide along the flanks before crossing the outer rim -the venter- uninterrupted. The Otoitidae is the ancestral family of the Stephanocerataceae and is known only from a relatively short interval of time within the Bajocian stage at the beginning the Middle Jurassic and begins with ''Docidoceras''. They gave rise, probably through varieties of ''Docidoceras'' to the Stephanoceratidae and Sphaeroceratidae, which in turn gave rise to the different phylogenetic branches within the Stephacerataceae. ==References== * Arkell, ''et al.''. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L, Ammonoidea; Geol Soc of America and Univ Kansas press, 1956. 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「Otoitidae」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.