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Cited by 238

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Morphological disparity in Ordovician-Devonian crinoids and the early saturation of morphological space

Foote, Mike·1994·Paleobiology
DOI 10.1017/s009483730001280x
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Abstract

It has been argued that many clades originating in the early Paleozoic filled their design space rapidly while still at low taxonomic diversity. Standardization of morphology for analytical purposes facilitates testing of this claim. Here I document evolutionary patterns of morphological disparity in Ordovician-Devonian crinoids, using a set of 75 discrete characters covering the principal features of the crinoid stem, cup, tegmen, and arms. Disparity is measured as the average dissimilarity among species, the range of morphospace occupied, and the number of realized character-state combinations. Comparison with generic richness reveals that the full range of form was essentially attained by the early part of the Caradocian, long before the time of maximal taxonomic diversity. Despite subsequent taxonomic diversification, the variety of crinoid form did not expand appreciably; increased diversity was accommodated by the evolution of variations upon the spectrum of designs established earlier. The data discussed here do not definitively imply specific sources of constraint, but the effective stasis in disparity supports previous arguments that some morphological limits were reached early in crinoid history.

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Metadata

Authors
Foote, M.
Venue
Paleobiology
Publisher
Cambridge University Press (CUP)
Published
1994
Volume
20
Issue
3
Pages
320-344
ISSN
  • 0094-8373 (ISSN-L)
  • 1938-5331
DOI
10.1017/s009483730001280x
OpenAlex
W2346847095
Cited by
238
References
8
FWCI
8.69
Type
journal article
Language
en
Open access
closed
Licence
www.cambridge.org/core/terms (unspecified, 8073 d)

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