翻訳と辞書 |
Savageoceras : ウィキペディア英語版 | Savageoceras
The genus ''Savageoceras'' is a barrandeoceratid first known from the Middle Silurian of Illinois consisting of rapidly enlarging, depressed cyrtocones with a trapazoidal section; ventral side wider and flatter than dorsal; sides converging on dorsum. Sutures have slight lateral and ventral lobes and ventrolateral saddles. The surface is covered by transverse striae and has rib-like annulae that are more prominent at the ventrolateral shoulders but otherwise vaguely defined. The siphuncle is central; interior unknown. ==References==
* Sweet, W.C. Nautiloidea - Barrandeocerida. ''Treatise on Invertebrate Paleontology'', Part K. Geological Soc. of America and Univ. of Kansas press.
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「Savageoceras」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.
|
|