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The ontogeny of Failleana and the origin of the Bumastinae (Trilobita)

Published online by Cambridge University Press:  01 May 2009

R. Ludvigsen  and
B. D. E. Chatterton
R. Ludvigsen
Affiliation:
Department of Geology, University of Toronto, Toronto, Ontario M5S 1A1
B. D. E. Chatterton
Affiliation:
Department of Geology, University of Alberta, Edmonton, Alberta T6G 2E1
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Summary

The metaprotaspid of the bumastine Failleana calva is similar to protaspids of scutelluids, whilst late meraspids and early holaspids of F. calva are similar to fully mature styginids. This suggests that the bumastines were derived from the styginids in the Early Ordovician and that the bumastines later gave rise to the scutelluids. Bumastus and similar Silurian trilobites are phyletic derivatives of Ordovician bumastines and not effaced scutelluids as claimed recently by Lane & Thomas. Revised diagnoses of Illaeninae and Bumastinae are presented.

Type
Articles
Information
Geological Magazine , Volume 117 , Issue 5 , September 1980 , pp. 471 - 478
Copyright
Copyright © Cambridge University Press 1980

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