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Ontogeny in the fossil record: diversification of body plans and the evolution of "aberrant" symmetry in Paleozoic echinoderms
From:
Paleobiology
| Date:
January 1, 2007| Author:
Sumrall, Colin D; Wray, Gregory A
| Copyright Paleontological Society Winter 2007. Provided by ProQuest LLC.Copyright information
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Abstract.-
Echinoderms have long been characterized by the presence of ambulacra that exhibit pentaradiate symmetry and define five primary body axes. In reality, truly pentaradial ambulacral symmetry is a condition derived only once in the evolutionary history of echinoderms and is restricted to eleutherozoans, the clade that contains most living echinoderm species. In contrast, early echinoderms have a bilaterally symmetrical 2-1-2 arrangement, with three ambulacra radiating from the...
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