Universal Elemental Homology in Glyptocystitoids, Hemicosmitoids, Coronoids and Blastoids: Steps Toward Echinoderm Phylogenetic Reconstruction in Derived Blastozoa

ASU Author/Contributor (non-ASU co-authors, if there are any, appear on document)
Johnny A. Waters Ph.D., Professor: Invertebrate Paleontology (Creator)
Appalachian State University (ASU )
Web Site: https://library.appstate.edu/

Abstract: Abstract- Universal elemental homology (UEH) is used to establish homology of thecal plates and elements of the ambulacral system among clades of stemmed echinoderms by placing these structures into a testable hypothesis of homology. Here UEH is used to explorehypotheses of homology in blastoids, coronoids, Lysocystites,hemicosmitoids, and glyptocystitoids. This new approach to analyzehomology is particularly powerful in understanding the nature of thethecal plates of blastoids and how they relate to other taxa in a common nomenclatural lexicon. In blastoids, deltoids are interpretedas oral plates that are homologues to oral plates of glyptocystitoids and hemicosmitoids whereas side plates are interpreted to beambulacral floor plates. Thecal plates are homologous among blastoids, coronoids and Lysocystites but these morphologies cannotbe reconciled with plate circlets of glyptocystitoids and hemicosmitoids. A phylogenetic analysis of these taxa presents the origin of blastoids as sister taxon of coronoids within a testable seriesof homologies.

Additional Information

Sumrall, Colin & Waters, Johnny(2012) Universal Elemental Homology in Glyptocystitoids, hemiscosmitoids, coronoids and blastoids: Steps Toward Echinoderm phylogenetic reconstruction in Derived Blastozoa. The Paleontological Society(volume 86(issue 6)) version of record available from (http://paleosoc.org/) [ DOI 0022-3360]
Language: English
Date: 2012
Glyptocystitoids, Hemicosmitoids, Coronoids

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