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The Late Cambrian (Marjuman) trilobite genus Hysteropleura Raymond from the Cow Head Group, western Newfoundland

Published online by Cambridge University Press:  20 May 2016

Stephen R. Westrop  and
Rolf Ludvigsen
Stephen R. Westrop
Affiliation:
Oklahoma Museum of Natural History and School of Geology and Geophysics, University of Oklahoma, Norman 73019,
Rolf Ludvigsen
Affiliation:
School of Earth and Ocean Sciences, University of Victoria, Victoria, British Columbia V8W 2Y2, Canada [Mailing Address: Denman Institute for Research on Trilobites, 3390 Denman Road, Denman Island, British Columbia V0R 1T0]
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Abstract

Although known previously from only two specimens from northern Greenland, new material from Marjuman boulders in debris flows of the Cow Head Group of western Newfoundland demonstrate that Verditerrina Robison is a menomoniid trilobite that is closely related to Hysteropleura Raymond. Following a parsimony analysis using the PAUP program, Verditerrina is used at the subgeneric level to label a distinctive monophyletic group within Hysteropleura. Three new species are established for the Newfoundland material: Hysteropleura (Verditerrina) adraini, H. (V.) edgecombei and H. (V.) ramskoldi. All three species undergo substantial modification of the anterior border of the cranidium during holaspid ontogeny. Two of the species, H. (V.) adraini and H. (V.) edgecombei, develop elongate, tongue-like borders that are reminiscent of those of calymenids such as Spathocalymene Tillman.

Type
Research Article
Information
Journal of Paleontology , Volume 74 , Issue 6 , November 2000 , pp. 1020 - 1030
Copyright
Copyright © The Paleontological Society

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