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BOOK EXCERPT:
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.
Product Details :
Genre |
: Science |
Author |
: Colin D. Sumrall |
Publisher |
: Cambridge University Press |
Release |
: 2023-04-13 |
File |
: 91 Pages |
ISBN-13 |
: 9781009397162 |
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BOOK EXCERPT:
This Element reviews the ecologies of skeletal trace-producing interactions on echinoids in Modern ecosystems and the recognition of those biogenic traces in the fossil record. This title is also available as Open Access on Cambridge Core.
Product Details :
Genre |
: Reference |
Author |
: Elizabeth Petsios |
Publisher |
: Cambridge University Press |
Release |
: 2023-10-31 |
File |
: 88 Pages |
ISBN-13 |
: 9781108899840 |
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BOOK EXCERPT:
This text discusses whether the origin of radically new kinds of organisms - new higher taxa - are the result of normal Darwinian evolution proceeding, or whether unusual genetic processes and/or special environmental circumstances are necessary.
Product Details :
Genre |
: Science |
Author |
: T. S. Kemp |
Publisher |
: University of Chicago Press |
Release |
: 2016 |
File |
: 215 Pages |
ISBN-13 |
: 9780226335957 |
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BOOK EXCERPT:
Product Details :
Genre |
: Evolution |
Author |
: |
Publisher |
: |
Release |
: |
File |
: 426 Pages |
ISBN-13 |
: UCSD:31822006505341 |