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Systematics of some Late Ordovician encrinurine trilobites from Laurentian North America

Published online by Cambridge University Press:  14 July 2015

David K. Moss  and
Stephen R. Westrop
David K. Moss
Affiliation:
Department of Earth Sciences, Syracuse University, Syracuse, NY 13244, USA,
Stephen R. Westrop
Affiliation:
School of Geology and Geophysics, University of Oklahoma, Norman, OK 73072, USA,
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Abstract

Classification and relationships of the Ordovician encrinurines Frencrinoides Lespérance and Desbiens and Walencrinoides Lespérance and Desbiens are poorly understood, with little evidence for monophyly of either genus. We revise the type species of both genera, F. capitonis (Frederickson) and W. rarus (Walcott), using new and archival material. We explore their species composition and phylogenetic relationships with a parsimony analysis that includes 17 well-documented ingroup species that can be coded readily, and which is rooted with Encrinuroides regularis Parnaste, the oldest known encrinurine. The results support monophyly of Frencrinuroides and Walencrinuroides, albeit with more limited species membership than proposed by Lespérance and Desbiens. Previous suggestions that both E. uncatus Evitt and Tripp and E. neuter Evitt and Tripp should be assigned to Erratencrinurus Kruger are also supported by our analysis, as is monophyly of Physemataspis Evitt and Tripp. New species are W. rolfi and W. tremblayi.

Type
Research Article
Information
Journal of Paleontology , Volume 88 , Issue 6 , November 2014 , pp. 1095 - 1119
Copyright
Copyright © The Paleontological Society 

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