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Notes on the Cheiruracea and Phacopacea

Published online by Cambridge University Press:  01 May 2009

J. T. Temple
J. T. Temple
Affiliation:
Department of Geology, Birkbeck College, London.
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Abstract

The cephalic characters which the post-Cambrian trilobite families Encrinuridae, Pliomeridae, Cheiruridae, and Phacopidae have in common are discussed, together with others which illustrate the distinctness of the Phacopidae. The importance of growth-rate studies is emphasized, particularly with reference to the frontal lobe of the glabella. The Calymenidae share most of the features common to the Cheiruracea and Phacopacea, and are considered to be closely related to them, and the Odontppleuridae also share certain features. The possibly neotenous origin of the Cheiruracea and Phacopacea is discussed.

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Type
Articles
Information
Geological Magazine , Volume 93 , Issue 5 , October 1956, pp. 418 - 430
Copyright
Copyright © Cambridge University Press 1956

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