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The Upper Cambrian bradoriid ostracod Cyclotron lapworthi is a hesslandonid

Published online by Cambridge University Press:  03 November 2011

Mark Williams ,
David J. Siveter ,
Adrian W. A. Rushton  and
Vivianne Berg-Madsen
Mark Williams
Affiliation:
Department of Geology, University of Leicester, Leicester LE17RH, UK
David J. Siveter
Affiliation:
Department of Geology, University of Leicester, Leicester LE17RH, UK
Adrian W. A. Rushton
Affiliation:
British Geological Survey, Keyworth, Nottingham NG12 5GG, UK
Vivianne Berg-Madsen
Affiliation:
Palaeontological Museum, University of Uppsala, Norbyvagen 22, S-752 36 Uppsala, Sweden
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Abstract

Cyclotron lapworthi (Groom, 1902), one of the few British Cambrian bradoriid ostracod species known from a large number of specimens, is redescribed. It has an interdorsum, thus indicating a hesslandonid affinity. The ontogeny of C. lapworthi does not demonstrate a clear distinction of its individual moult stages but does show marked changes in the development of nodes and lobes. C. lapworthi shows wide variation in carapace shape possibly indicating that its valves were thin and relatively flexible. In England and Canada C. lapworthi is restricted to the Upper Cambrian Olenus Zone. C. lapworthi may also occur coevally in the Upper Cambrian of Sweden.

Keywords

Ostracodaontogenybiostratigraphypalaeoecologytaxonomy
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 85 , Issue 2 , 1994 , pp. 123 - 130
Copyright
Copyright © Royal Society of Edinburgh 1994

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