A New Crinoid Genus from the Middle Devonian of Iowa, USA (Camerata, Melocrinitidae)

David R. Cordie; Brian J. Witzke

doi:10.2517/2016PR014

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David R. Cordiehttps://orcid.org/0000-0003-1675-8206,¹ Brian J. Witzke²

¹Department of Geosciences, University of Wisconsin-Milwaukee, 3209 N. Maryland Ave., Milwaukee, WI 53211, U.S.A. (e-mail: ) drcordie@uwm.edu
²Department of Earth and Environmental Sciences, University of Iowa, 123 North Capitol St., Iowa City, IA 52242, U.S.A.

Abstract

This study describes a new genus of melocrinitid crinoid from the Middle Devonian, Givetian Stage, of Iowa (subclass Camerata, family Melocrinitidae). The specimen described is assigned to Ronsocrinus gen. nov. within the family Melocrinitidae. Ronsocrinus rabia gen. et sp. nov. possesses a long heteromorphic column, small calyx plates with raised stellate patterns and a well-developed, long anal tube. Species within the family Melocrinitidae do not commonly possess a long anal tube or a spherical cup shape and the family diagnosis is expanded to include species with these characteristics.

Citation Download Citation

David R. Cordie and Brian J. Witzke "A New Crinoid Genus from the Middle Devonian of Iowa, USA (Camerata, Melocrinitidae)," Paleontological Research 21(1), 7-13, (1 January 2017). https://doi.org/10.2517/2016PR014

Received: 19 December 2015; Accepted: 1 March 2016; Published: 1 January 2017

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