A Review and Evaluation of Homology Hypotheses in Echinoderm Paleobiology

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Colin D. Sumrall (University of Tennessee) Sarah L. Sheffield (University of South Florida)

A Review and Evaluation of Homology Hypotheses in Echinoderm Paleobiology

Colin D. Sumrall (University of Tennessee), Sarah L. Sheffield (University of South Florida), Jennifer E. Bauer (Michigan State University) , Jeffrey R. Thompson (University of Southampton)

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English

Cambridge University Press
13 April 2023

Evolution; Zoology: Invertebrates; Palaeontology

Series: Elements of Paleontology

Summary
Details

The extraxial-axial theory (EAT) and universal elemental homology (UEH) are often portrayed as mutually exclusive hypotheses of homology within pentaradiate Echinodermata. EAT describes homology upon the echinoderm bauplan, interpreted through early post-metamorphic growth and growth zones, dividing it into axial regions generally associated with elements of the ambulacral system and extraxial regions that are not. UEH describes the detailed construction of the axial skeleton, dividing it into homologous plates and plate series based on symmetry, early growth, and function. These hypotheses are not in conflict; the latter is rooted in refinement of the former. Some interpretive differences arise because many of the morphologies described from eleutherozoan development are difficult to reconcile with Paleozoic forms. Conversely, many elements described for Paleozoic taxa by UEH, such as the peristomial border plates, are absent in eleutherozoans. This Element recommends these two hypotheses be used together to generate a better understanding of homology across Echinodermata.

By: Colin D. Sumrall (University of Tennessee), Sarah L. Sheffield (University of South Florida), Jennifer E. Bauer (Michigan State University), Jeffrey R. Thompson (University of Southampton), Johnny A. Waters (Appalachian State University, North Carolina)
Imprint: Cambridge University Press
Country of Publication: United Kingdom
Dimensions: Height: 229mm, Width: 152mm, Spine: 3mm
Weight: 103g
ISBN: 9781009397179
ISBN 10: 1009397176
Series: Elements of Paleontology
Pages: 75
Publication Date: 13 April 2023
Audience: College/higher education , Further / Higher Education
Format: Paperback
Publisher's Status: Active