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Zittelloceras
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Zittelloceras : ウィキペディア英語版
Zittelloceras


''Zittelloceras'' is an extinct nauiloid genus from the order Oncocerida which are among a large group of once diverse and numerous shelled cephalopods, now represented by only a handful of species.
''Zittleoceras'', which is included in the family Oncoceratidae, is characterized by subcircular or sightly depressed cyrtoconic shells with ventral, suborthochoanitic empty siphuncles; the shell surface typically with crenulated transverse frills or distinct noncrenulated annulations. ''Zittleoceras'' has been found in middle and upper Ordovician sediments in North America and Scotland. (Sweet, 1964)
==See also==

* Nautiloid
*
* List of nautiloids

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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