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| 	Heminautilus  : ウィキペディア英語版 |   Heminautilus
    ''Heminautilus'' is an extinct nautiloid genus from the nautilacean family Cymatoceratidae that lived during the early Cretaceous ( 1964). Nautiloids are a subclass of shelled cephalopods that were once diverse and numerous but are now represented by only a handful of species. ''Heminautilus'' has a discoidal compressed involute shell with flanks converging on a narrow flattened outer margin, the venter. Whorls are higher than wide. The suture is sinuous with a ventral lobe, subtriangular saddles on the ventral shoulders, broad lateral lobes, and narrow rounded saddles on the umbilical shoulders. The siphuncle is subcentral ( 1964). ==See also==
  * 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)』 ■ウィキペディアで「Heminautilus」の詳細全文を読む
 
 
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