<紀要論文>
Evolution of the Nostoceratidae (Cretaceous Heteromorph Ammonoids)

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概要 Comments are given on the classification of the Cretaceous heteromorphy ammonoid family Nostoceratidae. A new genus is proposed to accommodate a distinct group of species, which is similar to Turrilit...oides in the mode of coiling and ribbing but has the apertural part of the body-chamber facing obliquely upward. This is probably ancestral to Didymoceras and several other genera, occupying a fundamental stock in the. family in parallel with Hyphantoceras. Thus two major lines of descent may be distinguished in the Nostoceratidae.続きを見る

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登録日 2015.10.28
更新日 2021.02.18

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