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Xenodiscus
''Xenodiscus'' is an extinct ammonoid cephalopod genus and one of the earliest ceratites, found in the Upper Permian of northern India and Timor. ''Xenodiscus'' is included in the family Xenodiscidae which is part of the ceratite superfamily Xenodiscaceae ''Xenodiscus'' has a thinly discoidal and ribbed shell with ceratitic sutures, coiled so all whorls are exposed. The whorl section is subquadrate and compressed, so as to be narrower than high. ==''References''==
* Arkell et al., 1957; Suborder Ceratitina in the Treatise on Invertebrate Paleontology Part L Ammonoidea; Geological Soc. of America and Univ Kansas press.
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「Xenodiscus」の詳細全文を読む
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