Early phylogeny of crinoids within the pelmatozoan clade

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  • William I. Ausich
    School of Earth Sciences The Ohio State University 155 South Oval Mall Columbus OH 43210 USA
  • Thomas W. Kammer
    Department of Geology and Geography West Virginia University Morgantown WV 26506 USA
  • Elizabeth C. Rhenberg
    Department of Geology Earlham College 801 National Road West Richmond IN 47374‐4095 USA
  • David F. Wright
    School of Earth Sciences The Ohio State University 155 South Oval Mall Columbus OH 43210 USA
  • Andrew Smith
    editor

書誌事項

公開日
2015-10-05
権利情報
  • http://onlinelibrary.wiley.com/termsAndConditions#vor
DOI
  • 10.1111/pala.12204
公開者
Wiley

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説明

<jats:title>Abstract</jats:title><jats:p>Phylogenetic relationships among early crinoids are evaluated by maximizing parsimonious‐informative characters that are unordered and unweighted. Primarily <jats:styled-content style="fixed-case">T</jats:styled-content>remadocian–<jats:styled-content style="fixed-case">D</jats:styled-content>arriwilian (<jats:styled-content style="fixed-case">E</jats:styled-content>arly–<jats:styled-content style="fixed-case">M</jats:styled-content>iddle <jats:styled-content style="fixed-case">O</jats:styled-content>rdovician) taxa are analysed. Stratigraphic congruence metrics support the best phylogenetic hypothesis derived using parsimony methods. This study confirms the traditionally recognized lineages of <jats:styled-content style="fixed-case">P</jats:styled-content>alaeozoic crinoids and provides new information on the branching order of evolving lineages. Camerates are basal crinoids with progressively more tipward groups (from an <jats:styled-content style="fixed-case">O</jats:styled-content>rdovician perspective) being protocrinoids, cladids (paraphyletic), hybocrinids and disparids. The <jats:styled-content style="fixed-case">P</jats:styled-content>rotocrinoida should be maintained, but the <jats:styled-content style="fixed-case">A</jats:styled-content>ethocrinida should be placed within the <jats:styled-content style="fixed-case">C</jats:styled-content>ladida. The results of this study identify phylogenetic structure amongst the major early crinoid lineages and delineate the relative positions of crinoid higher taxa along a tree. Each valid higher taxon discussed herein requires a comprehensive treatment to delimit within‐lineage phylogenetic relationships.</jats:p>

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