Project 2182: W. I. Ausich, T. W. Kammer, E. C. Rhenberg, D. F. Wright, A. Smith. 2015. Early phylogeny of crinoids within the pelmatozoan clade. Palaeontology. 58 (6):937-952.
Specimen: † Echinosphaerites (unvouchered)
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Phylogenetic relationships among early crinoids are evaluated by maximizing parsimonious‐informative characters that are unordered and unweighted. Primarily Tremadocian–Darriwilian (Early–Middle Ordovician) taxa are analysed. Stratigraphic congruence metrics support the best phylogenetic hypothesis derived using parsimony methods. This study confirms the traditionally recognized lineages of Palaeozoic crinoids and provides new information on the branching order of evolving lineages. Camerates are basal crinoids with progressively more tipward groups (from an Ordovician perspective) being protocrinoids, cladids (paraphyletic), hybocrinids and disparids. The Protocrinoida should be maintained, but the Aethocrinida should be placed within the Cladida. 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.

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Article DOI: 10.1111/pala.12204

Project DOI: 10.7934/P2182,
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MorphoBank Project 2182
  • Creation Date:
    26 May 2015
  • Publication Date:
    22 January 2020
  • Project views: 3931

    This research
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    Authors' Institutions

    • Ohio State University

    • West Virginia University

    • Earlham College


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    MorphoBank Curator
    Project Administrator
    Maureen Admin
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    William Ausich
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