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Aglaspidida (Arthropoda) from the Upper Cambrian of Wisconsin

Published online by Cambridge University Press:  20 May 2016

Stephen P. Hesselbo
Stephen P. Hesselbo*
Affiliation:
Department of Earth Sciences, University of Oxford, Parks Road, Oxford, OX1 3PR, U.K.
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Abstract

New specimens of aglaspidid arthropods, mainly from the Upper Cambrian St. Lawrence Formation of Wisconsin (Upper Dikelocephalus Zone), show that appendages previously assigned to the genotype Aglaspis barrandei actually belong to a new genus and species Flobertia kochi. Chraspedops fragilis is transferred to a new genus Tuboculops. The generic attribution of Aglaspis dorsetensis and Aglaspis franconensis is queried. The distinction at species level is queried for Setaspis spinulosus and S. regularis and also for Aglaspoides sculptilis and A. semicircularis, although no formal changes are recommended. Aglaspis simplex is transferred to Glypharthrus simplex and Glypharthrus deadwoodensis is synonymized with Glypharthrus vulpes. Restorations are presented of Aglaspis barrandei, Aglaspis spinifer, and Glypharthrus thomasi. Aglaspis spinifer probably had a total of four head appendages. Well-preserved aglaspidid specimens often evince tergal processes that are apparently unique to this taxon and these may have acted as apodemes.

Type
Research Article
Information
Journal of Paleontology , Volume 66 , Issue 6 , November 1992 , pp. 885 - 923
Copyright
Copyright © The Paleontological Society 

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