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Evolutionary significance of the blastozoan Eumorphocystis and its pseudo-arms

Published online by Cambridge University Press:  03 November 2020

Thomas E. Guensburg Open the ORCID record for Thomas E. Guensburg [Opens in a new window] ,
James Sprinkle ,
Rich Mooi  and
Bertrand Lefebvre
Thomas E. Guensburg
Affiliation:
IRC, The Field Museum, 1400 South Lake Shore Drive, Chicago, Illinois 60605
James Sprinkle
Affiliation:
Department of Geological Sciences, Jackson School of Geosciences, University of Texas, 1 University Station C1100, Austin, Texas 78712-0254
Rich Mooi
Affiliation:
Department of Invertebrate Zoology, California Academy of Sciences, 55 Music Concourse Drive, San Francisco, California 94118
Bertrand Lefebvre
Affiliation:
Univ Lyon, Univ Lyon 1, ENSL, CNRS, LGL-TPE, F-69622, Villeurbanne, France
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Abstract

Twelve specimens of Eumorphocystis Branson and Peck, 1940 provide the basis for new findings and a more informed assessment of whether this blastozoan (a group including eocrinoids, blastoids, diploporites, rhombiferans) constitutes the sister taxon to crinoids, as has been recently proposed. Both Eumorphocystis and earliest-known crinoid feeding appendages express longitudinal canals, a demonstrable trait exclusive to these taxa. However, the specimen series studied here shows that Eumorphocystis canals constrict proximally and travel within ambulacrals above the thecal cavity. This relationship is congruent with a documented blastozoan pattern but very unlike earliest crinoid topology. Earliest crinoid arm cavities lie fully beneath floor plates; these expand and merge directly with the main thecal coelomic cavity at thecal shoulders. Other associated anatomical features echo this contrasting comparison. Feeding appendages of Eumorphocystis lack two-tiered cover plates, podial basins/pores, and lateral arm plating, all features of earliest crinoid ‘true arms.’ Eumorphocystis feeding appendages are buttressed by solid block-like plates added during ontogeny at a generative zone below floor plates, a pattern with no known parallel among crinoids. Eumorphocystis feeding appendages express brachioles, erect extensions of floor plates, also unknown among crinoids. These several distinctions point to nonhomology of most feeding appendage anatomy, including longitudinal canals, removing Eumorphocystis and other blastozoans from exclusive relationship with crinoids. Eumorphocystis further differs from crinoids in that thecal plates express diplopores, respiratory structures not present among crinoids, but ubiquitous among certain groups of blastozoans. Phylogenetic analysis places Eumorphocystis as a crownward blastozoan, far removed from crinoids.

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Journal of Paleontology , Volume 95 , Issue 2 , March 2021 , pp. 327 - 343
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Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Paleontological Society

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