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

Grypoceratidae is the longest-lived family of the Trigonocerataceae, or of the near equivalent Centroceratina; members of the Nautilida from the Upper Paleozoic and Triassic.(Kummel 1964)
==Diagnosis==
The Grypoceratidae are characterized by evolute to involute shells that may have some modification to the venter (the outer rim) varying from flattened to subangular, or bearing a keel. Most are smooth but some have nodes or carinae (auxiliary keels). Sutures generally have distinct ventral and lateral lobes but in some, a ventral saddle. Whorl sections are generally compressed but may be subquadrate to subtrapizoidal or coronate (heart shaped), or slightly depressed dorso-ventrally. (Flower 1950, Kummel 1964)

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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