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Hammatoceratidae : ウィキペディア英語版 | Hammatoceratidae
Hammatoceratidae is a family of middle Jurassic ammonites included in the superfamily Hammatoceratoidea. ==Diagnosis== Hammatoceratidae comprises genera which are characterized by ribbed evolute shells (all whorls visible), some bearing keels along the venter.〔 Those in the Phymatoceratinae have more simple ribbing while those in the Hammatoceratinae have ribbing that branch higher up on the whorl sides, divided into primaries and secondaries.
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「Hammatoceratidae」の詳細全文を読む
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