翻訳と辞書 |
Nannolytoceras : ウィキペディア英語版 | Nannolytoceras
''Nannolytoceras'' is an extinct genus of lytoceratid ammonite, family Lytoceratidae, with a stratigraphic range extending from the Bajocian age to Bathonian age (Medium Jurassic).〔Sepkoski, Jack (Sepkoski's Online Genus Database – Cephalopoda )〕 ==Description== Shells of ''Nannolytoceras'' species reach a diameter of about .〔(Ammonites Nannolytoceras - Nannolytoceras tripartitum )〕〔(Ammonites.fr )〕 The shell is evolute, smooth, tubular to compressed, with a variable number of more or less regularly spaced deep constrictions.〔 The very thin ribs crossing the ventral region are barely visible. Umbilicus is relatively large. The suture line is of ammonitic type.〔(Redjaen )〕 These cephalopods were fast-moving nektonic carnivores.〔
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「Nannolytoceras」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.
|
|