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Gastropod radulae and the assessment of form in evolutionary paleontology

Published online by Cambridge University Press:  08 February 2016

Carole S. Hickman
Carole S. Hickman*
Affiliation:
Department of Paleontology, University of California, Berkeley, CA 94720
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Abstract

Evolutionary paleontologists seek explanations of form and pattern in a diversity of contexts. A review of this diversity is presented to underscore the difficulty of producing a general model of the factors controlling the morphology of real organisms. A model specific to the marine prosobranch gastropod radula identifies seven factors contributing to form and pattern: (1) phylogenetic, (2) mechanical, (3) ecological, (4) programmatic, (5) maturational, (6) degenerative, and (7) constructional. Aspects of radular morphology attributable to each factor are illustrated in scanning electron micrographs of radulae of marine prosobranch gastropods. Applications of and extrapolations from the radular model are made to promote recognition of a broader range of interacting factors in other systems. Some aspects of form and pattern convey important information about non-evolutionary processes and phenomena and are best examined outside of the evolutionary framework.

Type
Articles
Information
Paleobiology , Volume 6 , Issue 3 , Summer 1980 , pp. 276 - 294
Copyright
Copyright © The Paleontological Society 

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