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Levisoceras
''Levisoceras'' is an early Ordovician ellesmerocerid cephalopod.〔Flower, R.H. 1964. The Nasutiloid Order Ellesmerocerida (Cephalopoda); Memoir 12, New Mexico Bureau of Mines and Mineral Resources, Socorro N.M.〕
== Morphology == ''Levisoceras'' is a distinctive ellesmeroceratid that combines rapid expansion a strong endogastric curvature. The cross section is compressed with the height increasing more rapidly than the width. The siphuncle is ventral and expands much as the shell itself.〔 In one specimen〔 the height was found to be around four centimetres and the width 2.5 cm. The septa are approximately flat.
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「Levisoceras」の詳細全文を読む
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