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New earliest Ordovician trilobite genus Millardicurus: The oldest known hystricurid

Published online by Cambridge University Press:  11 August 2017

Jonathan M. Adrain  and
Stephen R. Westrop
Jonathan M. Adrain
Affiliation:
Department of Geoscience, University of Iowa, 121 Trowbridge Hall, Iowa City 52242,
Stephen R. Westrop
Affiliation:
Oklahoma Museum of Natural History and School of Geology and Geophysics, University of Oklahoma, Norman 73072,
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Abstract

Hystricurus millardensis Hintze, 1953 has been recorded widely in Laurentia. Revision on the basis of abundant new silicified topotype material indicates that most of these records are of morphologically distinct, though related, taxa and that a plexus of related species is involved. The new genus Millardicurus, with H. millardensis as type, is proposed for this clade, which also includes two well-documented new species, M. housensis and M. paramillardensis, from the House Formation of western Utah, several named species from Greenland, and several unnamed new species from various parts of Laurentia that have in the past been referred to M. millardensis. Millardicurus is not apparently closely related to younger Skullrockian-Stairsian hystricurids from Laurentia, but may be related to poorly known coeval Siberian Platform species classified in the genus Nyaya Rozova, 1963. Landmark-based geometric morphometric methods comprising principal component analysis of partial warp scores and Goodall's F test of pairwise means indicate significant shape differences among cranidia, librigenae, and pygidia of the House Formation species of Millardicurus.

Type
Research Article
Information
Journal of Paleontology , Volume 80 , Issue 4 , July 2006 , pp. 650 - 671
Copyright
Copyright © The Paleontological Society 

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