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Observations on Astiericeras astierianum (d'Orbigny, 1842) (Cretaceous Ammonoidea)

Published online by Cambridge University Press:  01 May 2009

W. J. Kennedy
W. J. Kennedy
Affiliation:
Geological Collections, University Museum, Parks Road, Oxford, OX1 3PW, U.K.
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Abstract

Astiericeras astierianum (d'orbigny, 1842) is redescribed, the type material illustrated for the first time and the range of intraspecific variation and striking sexualdimorphism documented. Previous suggestions that the early ontogeny of Astiericeras supports derivation from Douvilleiceras de Grossouvre, 1894 of the Douvilleiceratinae are in error: the genus and species are distinctive at the earliest diameters seen and ornament gives no clue to affinities. The sutural formula is that characteristic of some Douvilleicerataceae, however, to which superfamily the species is assigned, as the only member of the family Astiericeratidae Breistroffer, 1953. It is thus a scaphitoid heteromorph, derived from normally coiled immediate ancestors that are themselves recoiled derivatives of an original heteromorphic stock.

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Articles
Information
Geological Magazine , Volume 123 , Issue 5 , September 1986 , pp. 507 - 513
Copyright
Copyright © Cambridge University Press 1986

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