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A new otarionine trilobite from the Henryhouse Formation (Silurian, Ludlow) of Oklahoma

Published online by Cambridge University Press:  14 July 2015

Jonathan M. Adrain
Jonathan M. Adrain*
Affiliation:
Department of Palaeontology, The Natural History Museum, Cromwell Road, London SW7 5BD, United Kingdom
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Abstract

Cyphaspis wessmani new species is a morphologically aberrant taxon from the Ludlow Henryhouse Formation of south-central Oklahoma. Its long, scoop-shaped cephalic border is without close comparison in the family Aulacopleuridae, but its possession of eleven thoracic segments with an axial spine on the sixth, an inflated glabella with tiny L1 and dorsal tuberculate sculpture, a prominently expressed bilobate eye socle, and a micropygous pygidium all support assignment to Cyphaspis. The genus is common in Silurian rocks from most parts of the world, but C. wessmani is the first published record from southern Laurentia.

Type
Research Article
Information
Journal of Paleontology , Volume 70 , Issue 4 , July 1996 , pp. 611 - 614
Copyright
Copyright © The Paleontological Society 

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