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Testing the plateau: a reexamination of disparity and morphologic constraints in early Paleozoic crinoids

Published online by Cambridge University Press:  08 April 2016

Bradley Deline  and
William I. Ausich
Bradley Deline
Affiliation:
Department of Geosciences, University of West Georgia, Carrollton, Georgia 30118. E-mail: [email protected]
William I. Ausich
Affiliation:
School of Earth Sciences, 125 South Oval, Ohio State University, Columbus, Ohio 43210. E-mail: [email protected]
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Abstract

Studies of crinoid morphology have been pivotal in understanding the constraints on the range of morphology within a clade as well as the patterns of disparity throughout the Phanerozoic. Newly discovered and described faunas and recent study of early Paleozoic crinoid diversity provide an ideal opportunity to reanalyze Ordovician through Early Silurian crinoid disparity with more complete taxonomic coverage and finer stratigraphic resolution. Using the coarse stratigraphic binning of Foote (1999), the updated morphologic data set has a similar disparity pattern to those previously reported for the early Paleozoic. However, with the more resolved stratigraphic binning used by Peters and Ausich (2008), a significant difference exists between the original and current data sets. Both data sets have a pronounced disparity high during the late Middle Ordovician. However, the updated disparity curve has a much higher initial disparity during the Early Ordovician and a pronounced rise in disparity during the Silurian recovery. Examination of differential sampling, proportions of the crinoid orders through time, and methods of coding characters indicate these factors have little effect on the pattern of crinoid disparity. The Silurian morphospace expansion occurs primarily within disparids and coincides with the origination of the myelodactylids. These findings corroborate the rapid expansion of morphospace during the Ordovician. However, crinoid disparity did not remain static and, although less frequent than during the initial radiation, new body plans evolved following the Ordovician Extinction (e.g., the myelodactylids). These results are consistent with the hypothesis of ecology constraining the limits on morphologic disparity at the class level.

Type
Articles
Information
Paleobiology , Volume 37 , Issue 2 , Spring 2011 , pp. 214 - 236
Copyright
Copyright © The Paleontological Society 

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References

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