Re: antiquity of segmentation

["Peter D. Roopnarine" <proopnar@xxxxxxxxxxxxxxxx>]

>I haven't followed the work, but I would be surprised if they were or
>would be found in echinoderms, given the radial symmetry. Although I guess
>that one could argue for "radial segmentation".
>
Actually I would not be too surprised, since echinoderm larvae are
bilaterally symmetric, and several possess dipleura characteristics. Several
aspects of chordate, and in general deuterostome segmentation, specifically
coelomic division, is a larval phenomenon, with a tripartite division of the
larval coelom.
Peter Roopnarine


"We have no adequate framework for law in a historical science, and history
in a lawful science." Stuart Kauffman, At Home in The Universe.

Dr. Peter D. Roopnarine
Department of Biology
Southeast Missouri State University
Cape Girardeau MO 63701
Phone:(573)651-2365
email:proopnar@biology.semo.edu
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Dr. Kim Driver
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