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Controlling factors in the evolution of the graptolites

Published online by Cambridge University Press:  01 May 2009

N. H. Kirk
N. H. Kirk
Affiliation:
Geology Department, University College of Wales, Penglais, Aberystwyth, SY24 5BG, U.K.
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Summary

Recent ideas on evolution in the graptolites have been based upon an assumption either of passive flotation and passive feeding, or of active and co-ordinated ciliary feeding resulting in automobility. These ideas are compared and a possible evolutionary consequence of automobility is suggested.

Type
Articles
Information
Geological Magazine , Volume 117 , Issue 3 , May 1980 , pp. 277 - 284
Copyright
Copyright © Cambridge University Press 1980

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