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Leymeriellidae : ウィキペディア英語版 | Leymeriellidae
Leymeriellidae is a family of Lower Cretaceous ammonites comprising rather small forms distinguished from Hoplitidae by their flattened and grooved ribs and virtual absence of umbilical tubercles. The family is suggested to be derived from the Desmoceratidae. ==Taxonomic position== Leymeriellidae are currently regarded is belonging to the Acanthoceratoidea according to W. J. Kennedy ''et al'' (1980). The previous placement was in the Hoplitoidea according W.J. Arkell ''et al'' (1957) in the ''Treatise on Invertebrate Paleontology, Part L''.
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「Leymeriellidae」の詳細全文を読む
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