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Part L, Mollusca 4 (Revised), vol. 4, Ch. 4, p. 206-258

1996; Linguagem: Inglês

10.17161/dt.v0i0.5282

ISSN

2153-621X

Autores

C.W. Wright, J. H. Calloman,

Tópico(s)

Marine Biology and Ecology Research

Resumo

Most members with heteromorphic coiling.Lateral lobe generally trifid, but bifid L developing independently in several stocks.Late Jurassic cyrtocones (Protancyloceras) apparently gave rise both to straight forms (Bochianites) and, later, to more closely coiled forms (Leptoceras and Crioceratitinae).These produced both involute forms that led to Douvilleicerataceae and Deshayesitaceae Cephalopoda-Cretaceous Ammonoidea

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