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Article: Early phylogeny of crinoids within the pelmatozoan clade

Palaeontology - Vol. 58 Part 6 - Cover Image
Publication: Palaeontology
Volume: 58
Part: 6
Publication Date: November 2015
Page(s): 937 952
Author(s): William I. Ausich, Thomas W. Kammer, Elizabeth C. Rhenberg, and David F. Wright
Addition Information

How to Cite

AUSICH, W.I., KAMMER, T.W., RHENBERG, E.C., WRIGHT, D.F. 2015. Early phylogeny of crinoids within the pelmatozoan clade. Palaeontology, 58, 6, 937-952. DOI: 10.1111/pala.12204

Author Information

  • William I. Ausich - The Ohio State University School of Earth Sciences Columbus OH USA (Email:
  • Thomas W. Kammer - West Virginia University Department of Geology and Geography Morgantown WV USA (Email:
  • Elizabeth C. Rhenberg - Earlham College Department of Geology Richmond IN USA (Email:
  • David F. Wright - The Ohio State University School of Earth Sciences Columbus OH USA (Email:

Publication History

  • Issue published online: 27 October 2015
  • Article first published online: 01 January 1970
  • Manuscript Accepted: 24 August 2015
  • Manuscript Received: 02 June 2015

Funded By

National Science Foundation. Grant Numbers: DEB 1036416, DEB 1036356

Online Version Hosted By

Wiley Online Library (Free Access)
Get Article: Wiley Online Library [Free Access]


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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