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Protaspid ontogeny of Bolaspidella housensis (Order Ptychopariida, Class Trilobita), and other similar Cambrian protaspides

Published online by Cambridge University Press:  26 July 2007

Dong-Chan Lee  and
Brian D. E. Chatterton
Dong-Chan Lee
Affiliation:
Department of Museum, Daejeon Health Sciences College, 77-3, Gayang2-dong, Dong-Gu, Daejeon, 300-711 South Korea, and Gyeryongsan Natural History Museum, 511-1 Hakbong-Ri, Banpo-Myeon, Gongju, Chungnam, 314-924 South Korea.
Brian D. E. Chatterton
Affiliation:
Department of Earth & Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada.
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Abstract

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The protaspid ontogeny of Bolaspidella housensis (Walcott, 1886) is re-described. This species is known from the Marjum Formation (Lower Marjuman Stage) of western Utah, USA. Three protaspid stages are recognised, with the instars discriminated most readily by different spacing between the postero-lateral ends of the fixigena. Protaspides of B. housensis are shown to be similar to those of Glaphyraspis parva, from several Upper Cambrian localities in the USA, and Ptychopariide sp. E from the Upper Cambrian of the Wasatch Mountains in Utah, USA.

Keywords

ProtaspidesMarjum Formation
Type
Research Article
Information
Earth and Environmental Science Transactions of The Royal Society of Edinburgh , Volume 96 , Issue 1 , March 2005 , pp. 21 - 41
Copyright
Royal Society of Edinburgh 2005