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An unusual new sinuitid mollusc (Bellerophontoidea, Gastropoda) from the Ordovician of Spain

Published online by Cambridge University Press:  14 July 2015

Jiří Frýda
Affiliation:
Český geologický ústav, Klárov 3/131, 118 21 Praha 1, Czech Republic
Juan Carlos Gutiérrez-Marco
Affiliation:
UEI Paleontología, Instituto de Geología Económica (CSIC-UCM), Facultad de Ciencias Geológicas, 28040 Madrid, Spain

Abstract

Hispanosinuites peeli new genus and species from the Lower Oretan shales (Middle Ordovician) of central Spain is described and placed in the new subfamily Hispanosinuitinae of the family Sinuitidae. This new subfamily is considered to represent a highly specialized phylogenetic lineage, which probably separated from the morphological range of the genus Sinuites during the Early Ordovician. The outer shell surface of Hispanosinuites peeli is entirely covered by secondary shell layers, which are interpreted as perinductura, inductura and coinductura. The similarity of these shell deposits in Hispanosinuites peeli and species of Euphemites suggests that these layers were secreted by mantle flaps having the same form in both genera. Hispanosinuites peeli is interpreted as a mobile mollusc with an internal shell adapted to an infaunal mode of life. Discovery of this unusual mollusc reopens the question of the phylogenetic relations of the families Sinuitidae and Euphemitidae, which are often assigned to different molluscan classes.

Type
Research Article
Copyright
Copyright © The Paleontological Society 

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