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Skeletal homologies of echinoderms

Published online by Cambridge University Press:  21 July 2017

Rich Mooi
Affiliation:
California Academy of Sciences, Golden Gate Park San Francisco, California 94118-4599 USA Paléontologie Analytique, UMR 5561, Centre des Sciences de la Terre 6, Bd. Gabriel, F-21000, Dijon, France
Bruno David
Affiliation:
California Academy of Sciences, Golden Gate Park San Francisco, California 94118-4599 USA Paléontologie Analytique, UMR 5561, Centre des Sciences de la Terre 6, Bd. Gabriel, F-21000, Dijon, France
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Abstract

The impressive array of disparity within the Echinodermata can be explained by the interplay of components (particularly skeletal elements) making up two major body wall regions: axial and extraxial. Axial skeleton comprises paired plate columns of the ambulacra, formed according to the Ocular Plate Rule (OPR) and in association with the water vascular system. Extraxial skeleton (subdivided into two subtypes: perforate and imperforate) is not formed according to the OPR, and new elements can be added anywhere and at any time within extraxial body wall. Recent work on early development of echinoderms reveals that axial skeleton is formed as an integral part of the rudiment, but that extraxial skeleton is derived from the non-rudiment part of the larval body. In addition to displaying such fundamental embryological and ontogenetic differences, the body wall regions have distinctive distributions and topologies that can be used to formulate criteria for their identification in any echinoderm regardless of how esoteric their morphology might be. Like the system of homologies that has long been established for vertebrates, the model of axial and extraxial skeletal types can be used to explore relationships among Recent and fossil taxa alike. Application of the model also leads to reassessment of previously published morphological characters and phylogenies.

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Research Article
Copyright
Copyright © 1997 by The Paleontological Society 

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