A review and evaluation of homology hypotheses in echinoderm paleobiology / Colin D. Sumrall [and four others].

Format:

Book

Author/Creator:

Sumrall, Colin Doyle, 1967- author.

Series:

Cambridge elements. Elements of paleontology, 2517-780X.

Cambridge elements. Elements of paleontology, 2517-780X

Language:

English

Subjects (All):

Echinodermata, Fossil.

Echinodermata--Evolution.

Echinodermata.

Evolutionary paleobiology.

Paleobiology--Methodology.

Paleobiology.

Physical Description:

1 online resource (44 pages) : digital, PDF file(s).

Edition:

First edition.

Place of Publication:

Cambridge ; New York, NY : Cambridge University Press, 2023.

Summary:

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.

Notes:

Title from publisher's bibliographic system (viewed on 24 Mar 2023).

Includes bibliographical references.

ISBN:

9781009397148

1009397141

9781009397162

1009397168

9781009397155

100939715X