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Journal of Paleontology 91(4):815–828
and assistance with specimens in museum collections; S. Sheffield for assistance coding Eumorphocystis; and S. Edie for kindly providing lodging while I visited the Field Museum collections. This study and an early draft of the manuscript were greatly improved by innumerable discussions with W. Ausich and D. Wright. I thank T. Kammer and an anonymous reviewer for thoughtful reviews of the manuscript and S. Zamora for helpful comments. This research was supported in part by graduate research grants from the Paleontological Society, Sigma Xi, The Ohio State University Friends of Orton Hall fund, and the Palaeontological Association, in addition to the National Science Foundation Assembling the Echinoderm Tree of Life grant (W. Ausich, DEB 1036416).
Accessibility of supplemental data
Data available from the Dryad Digital Repository: https://doi. org/10.5061/dryad.js3ph.
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