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A revision of the Ordovician olenid trilobite Triarthrus Green

Published online by Cambridge University Press:  01 May 2009

R. Ludvigsen  and
P. A. Tuffnell
R. Ludvigsen
Affiliation:
R.L. & P.A.T. Department of Geology, University of TorontoToronto, Ontario, CanadaM5S 1A1
P. A. Tuffnell
Affiliation:
R.L. & P.A.T. Department of Geology, University of TorontoToronto, Ontario, CanadaM5S 1A1
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Abstract

Summary. The large number of species assigned to Triarthrus Green are here allocated to three genera - ten species to a revised Triarthrus Green (late Caradoc-Ashgill), thirteen species to a revised Porterfieldia Cooper (Arenig-Llandeilo), and five species to Bienvillia Clark (Tremadoc-Arenig). Triarthrus lacks an anterior border furrow on the cranidium; this furrow is confined to the yoked cheeks. Both Porterfieldia and Bienvillia have an anterior border furrow on the cranidium; these genera are distinguished primarily on the length of the preglabellar field.

Type
Articles
Information
Geological Magazine , Volume 120 , Issue 6 , December 1983 , pp. 567 - 577
Copyright
Copyright © Cambridge University Press 1983

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