PROTASPIDES OF UPPER CAMBRIAN APHELASPIS (PTYCHOPARIIDA, TRILOBITA) AND RELATED SPECIES WITH THEIR TAXONOMIC IMPLICATIONS |
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| Authors: | DONG-CHAN LEE BRIAN D. E. CHATTERTON |
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| Affiliation: | Department of Earth and Atmospheric Sciences, University of Alberta, Edmonton, Alberta T6G 2E3, Canada;e-mails:;;;current address: Museum Department, Daejeon Health Sciences College, 77–3, Gayang 2-Dong, Dong-Gu, Daejeon, 300-711 South Korea |
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| Abstract: | Abstract: The ontogeny of Aphelaspis brachyphasis is illustrated and described on the basis of newly discovered silicified material from the McGill section, Nevada, USA. Protaspides of three other Aphelaspis species are redescribed. Of ptychopariide species for which protaspides have been documented, the protaspides of those previously considered to be closely related to Aphelaspis are illustrated herein. Protaspides of Aphelaspis are most similar to those of Olenus , supporting previous taxonomic suggestions that the Aphelaspidinae is closely related to the Olenidae and may be assigned to the Olenacea. The protaspides of Housia share few similarities with those of Aphelaspis , contradicting the hypothesis that these genera are placed together within the Pterocephaliidae. |
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| Keywords: | Aphelaspis ptychopariide protaspides taxonomic implications |
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