A review and evaluation of homology hypotheses in echinoderm paleobiology
A review and evaluation of homology hypotheses in echinoderm paleobiology
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.
Cambridge University Press
Sumrall, Colin D.
98822fe8-5fbe-4289-931a-8cadfdf93282
Sheffield, Sarah L.
14bfffb5-10c5-4655-947e-f5ad1833ac60
Bauer, Jennifer E.
64c7c320-6ab0-4a97-9d1e-8c5084009cd2
Thompson, Jeffrey R.
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Waters, Johnny A.
5d54313b-271c-4538-a384-29d4b5d03c9b
13 April 2023
Sumrall, Colin D.
98822fe8-5fbe-4289-931a-8cadfdf93282
Sheffield, Sarah L.
14bfffb5-10c5-4655-947e-f5ad1833ac60
Bauer, Jennifer E.
64c7c320-6ab0-4a97-9d1e-8c5084009cd2
Thompson, Jeffrey R.
d2c9b7bb-3e33-4918-97c8-0c36e7af30a4
Waters, Johnny A.
5d54313b-271c-4538-a384-29d4b5d03c9b
Sumrall, Colin D., Sheffield, Sarah L., Bauer, Jennifer E., Thompson, Jeffrey R. and Waters, Johnny A.
(2023)
A review and evaluation of homology hypotheses in echinoderm paleobiology
(Elements of Paleontology),
Cambridge University Press, 77pp.
Abstract
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.
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e-pub ahead of print date: 24 March 2023
Published date: 13 April 2023
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For the purpose of open access, the author has applied a CC BY public copyright license to any Author Accepted Manuscript version arising from this submission.
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Local EPrints ID: 481052
URI: http://eprints.soton.ac.uk/id/eprint/481052
PURE UUID: 8d7878f5-6edc-4c39-a097-072a9bd26111
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Date deposited: 15 Aug 2023 16:43
Last modified: 17 Mar 2024 04:15
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Author:
Colin D. Sumrall
Author:
Sarah L. Sheffield
Author:
Jennifer E. Bauer
Author:
Jeffrey R. Thompson
Author:
Johnny A. Waters
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