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Oxygonioceras : ウィキペディア英語版 | Oxygonioceras
''Oxygonioceras'' is a genus in the Oncocerid family, Brevicoceratidae, from the Middle Silurian of North America and Europe. ''Oxygonioceras'', named by Foeste, 1925, has a loosely coiled, dextrally torticonic shell with a rounded dorsum on the inside of the spiral and an angular or subangular venter on the outside; suture with broad lateral lobes and ventral siphuncle with expanded, nummuloidal segments. Although also torticonically gyroconic -- having an out of plane open spiral - ''Oxygonioceras'' differs from Naedyceras and closely related genera in that the siphuncle segments are empty, rather than being actinosiphonate. ==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「Oxygonioceras」の詳細全文を読む
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