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A Wenlockian (Silurian) gastropod shell and operculum from Siberia

Published online by Cambridge University Press:  20 May 2016

Alexander P. Gubanov  and
Ellis L. Yochelson
Alexander P. Gubanov
Affiliation:
Institute of Geology, Siberian Section, Russian Academy of Sciences, Novosibirsk 630090, Russia
Ellis L. Yochelson
Affiliation:
Department of Paleobiology, National Museum of Natural History, Washington, D.C. 20560, and U.S. Geological Survey (retired)
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Abstract

In a large collection of Wenlockian gastropods from north Siberia, a single small specimen shows the operculum in situ just within the aperture. In other morphologic features, particularly the presence of numerous spiral lirae on the shell, this species is similar to Silurian gastropods traditionally assigned to Oriostoma. Preservation of the operculum is far from perfect, but almost certainly it has paucispiral growth, rather than concentric or multispiral construction. This new species (Australonema varvarae n. sp.) is assigned to Australonema, previously known only from the Lower Devonian of Australia, primarily because of the form of the operculum. The material was obtained from just below a biostromal unit in a bed interpreted as an interreef lagoon in an area of locally relatively quiet water.

Type
Research Article
Information
Journal of Paleontology , Volume 68 , Issue 3 , May 1994 , pp. 486 - 491
Copyright
Copyright © The Paleontological Society 

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