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Akademische und professionelle Bücher  Palaeontology  Palaeozoology & Extinctions

A Review and Evaluation of Homology Hypotheses in Echinoderm Paleobiology

By: Colin D Sumrall(Author), Sarah L Sheffield(Author), Jennifer E Bauer(Author), Jeffrey R Thompson(Author), Johnny A Waters(Author)
75 pages
A Review and Evaluation of Homology Hypotheses in Echinoderm Paleobiology
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  • A Review and Evaluation of Homology Hypotheses in Echinoderm Paleobiology ISBN: 9781009397179 Paperback Apr 2023 Not in stock: Usually dispatched within 1-2 weeks
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About this book

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.

Contents

1. Introduction
2. Homology Hypotheses for Echinodermata
3. The Application of These Homology Hypotheses
4. Reconciling EAT and UEH
5. Future Areas of Study

References

Customer Reviews

By: Colin D Sumrall(Author), Sarah L Sheffield(Author), Jennifer E Bauer(Author), Jeffrey R Thompson(Author), Johnny A Waters(Author)
75 pages
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