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Winnipegoceras : ウィキペディア英語版 | Winnipegoceras
''Winnipegoceras'' is an extinct nautiloid genus from the Ordovician belonging to the Order Discosorida. ==Phylogeny== ''Winnipegoceras'' is included in the discosorid family Westonoceratidae and is derived from ''Westonoceras''. Westonoceratidae have mostly medium to large, compressed, exogastric shells with moderately sized siphuncles composed of short folded back septal necks and generally thin connecting rings with swollen bullettes and which contain internal linings. (Flower & Teichert 1957; Teichert 1964)
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「Winnipegoceras」の詳細全文を読む
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