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‘Aristocystites? subcylindricus var. de bohemicus Barrande, 1887’ is a valid species of Aristocystites (Echinodermata, Diploporita): description and taxonomic consequences

Published online by Cambridge University Press:  17 April 2019

Christopher R.C. Paul  and
Ronald L. Parsley
Christopher R.C. Paul
Affiliation:
School of Earth Sciences, University of Bristol, Bristol, UK
Ronald L. Parsley
Affiliation:
Department of Earth and Environmental Sciences, Tulane University, New Orleans, Louisiana 70118, USA, and Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
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Abstract

Barrande erected the genus Aristocystites, type A. bohemicus Barrande, in 1887. He listed other questionable species, including “A.? subcylindricus var. de bohemicus.” Aristocystites subcylindricus has not been accepted apart from Bather who in 1919 designated a type specimen and made it the type species of the new genus Hippocystis. No specimens available to Barrande or Bather preserved the oral area necessary to characterize Hippocystis or A. subcylindricus. Specimen 436969A, in the United States National Museum of Natural History is a more complete specimen of A. subcylindricus and preserves the oral area. This shows that A. subcylindricus is a valid species, but has two ambulacral facets, a character unique to the genus Aristocystites. Aristocystites subcylindricus has tumid plates with obvious sutures, a rounded thecal base, and a gonopore surrounded by three plates. Aristocystites bohemicus has smooth plates, an obvious attachment scar aborally and a gonopore within a single plate. Both species have occasional horseshoe-shaped diplopores.

UUID: http://zoobank.org/946c28a2-5783-4a6b-9111-416857bf9363

Type
Taxonomic note
Information
Journal of Paleontology , Volume 93 , Issue 4 , July 2019 , pp. 822 - 826
Copyright
Copyright © 2019, The Paleontological Society 

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