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Article: Redescription of Macurdablastus and redefinition of Eublastoidea as a clade of Blastoidea (Echinodermata)

Palaeontology - Vol. 62 Part 6 - Cover Image
Publication: Palaeontology
Volume: 62
Part: 6
Publication Date: November 2019
Page(s): 1003 1013
Author(s): Jennifer E. Bauer, Johnny A. Waters, and Colin D. Sumrall
Addition Information

How to Cite

BAUER, J.E., WATERS, J.A., SUMRALL, C.D. 2019. . Palaeontology, 62, 6, 1003-1013. DOI: /doi/10.1111/pala.12439

Author Information

  • Jennifer E. Bauer - Florida Museum of Natural History University of Florida Gainesville FL 32611 USA
  • Johnny A. Waters - Department of Geological & Environmental Sciences Appalachian State University Boone NC 28608 USA
  • Colin D. Sumrall - Department of Earth & Planetary Sciences The University of Tennessee Knoxville TN 37996 USA

Publication History

  • Issue published online: 18 October 2019
  • Manuscript Accepted: 02 May 2019
  • Manuscript Received: 27 September 2018

Funded By

Division of Environmental Biology. Grant Number: 1036260
Appalachian State University Foundation
University of Tennessee Discretionary Funds

Online Version Hosted By

Wiley Online Library
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Eublastoids are a large clade of blastoids; stemmed blastozoan echinoderms diagnosed by their conservative body plan (three basals, four deltoid plates and five radial plates), lancet plate supporting the ambulacra, and hydrospire respiratory structures. Although Eublastoidea was a highly successful clade in the middle and late Palaeozoic it is absent from early echinoderm radiations seen in the Cambrian and Ordovician record. Here we provide a re‐evaluation of Macurdablastus uniplicatus Broadhead from the Ordovician, using detailed morphological assessment based on advanced synchrotron tomography and phylogenetic analysis. Macurdablastus uniplicatus falls outside Eublastoidea because of the morphological differences in lancet plate and respiratory structures. The oldest recorded eublastoid is thus middle Silurian in age. The re‐evaluation of the morphology of Macurdablastus provides a basis for revising blastoid phylogeny and classification.

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