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Cyrtogomphoceratidae : ウィキペディア英語版 | Cyrtogomphoceratidae The Cyrtogomphoceratidae is a family in the cephalopod order Discosorida that comprises genera commonly with compressed, endogastrically curved shells. Siphuncles lie close to the ventral side, segments are broadly inflated, connecting rings thick and apically expanded thick bullettes. Chambers are short, separated by shallow, dish shaped septa. Apertures are generally simple. The Cyrtogomphoceratidae are derived from the discosorid family Reudemannoceratidae, probably from ''Reudemannoceras'', through the ancestral genus ''Ulrichoceras'', and have a range from the Middle Ordovician to the Lower Silurian. The family includes the following genera. : *''Cyrtogomphoceras'' 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「Cyrtogomphoceratidae」の詳細全文を読む
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