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Megalytoceratinae : ウィキペディア英語版 | Megalytoceratinae
Megalytoceratinae is a subfamily of lytoceratids ammonites consisting of planulate forms, i.e. those with moderately evolute compressed shells with bluntly rounded venters, in which the outer whorls become smooth and sutures tend to resemble those of the Perisphinctidae. The family includes two genera, ''Megalytoceras'', and ''Metrolytoceras'', from the Middle Bajocian of England and a third possible member, ''Asapholytoceras'', from the Toacian of southeastern Europe. ==References==
*W.J.Arkell, B.Kummel,& C.W.Wright 1957. Mesozoic Ammonoidea, Treatise on Invertebrate Paleontology, Part L Ammonoidea. R.C.Moore, (ed).
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「Megalytoceratinae」の詳細全文を読む
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