A revision of the Ordovician olenid trilobiteTriarthrusGreen

1 January 1983

journal article
research article
Published by Cambridge University Press (CUP) in Geological Magazine

Vol. 120 (6) , 567-577
https://doi.org/10.1017/s0016756800027722

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.

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