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Xenodiscidae : ウィキペディア英語版 | Xenodiscidae
The ''Xenodiscidae'' are the earliest of the Ceratitida and comprise Middle and Upper Permian genera characterized by compressed, discoidal, evolute shells with rounded to acute venters and commonly with lateral ribs. Sutures are goniatitic to weakly ceratitic.〔Arkell et al, 1957〕 The Xenodiscidae, which are part of the superfamily Xenodiscaceae, are derived from the Daraelitidae, a family in the Prolecanitida (ibid). In turn, the Xenodiscidae provided the root stock for the subsequent expansion and diversification of the Ceratitida in the Triassic. ==Notes== 〔
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「Xenodiscidae」の詳細全文を読む
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