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A new, giant ricinuleid (Arachnida, Ricinulei), from the Pennsylvanian of Illinois, and the identification of a new, ontogenetically stable, diagnostic character

Published online by Cambridge University Press:  23 December 2020

Niall Whalen  and
Paul Selden Open the ORCID record for Paul Selden [Opens in a new window]
Niall Whalen
Affiliation:
Department of Geology, University of Kansas, Lawrence, Kansas, USA Present address: Department of Biological Science, Florida State University, Tallahassee, FL32306, USA
Paul Selden*
Affiliation:
Department of Geology, University of Kansas, Lawrence, Kansas, USA Natural History Museum, London, LondonSW7 5BD, UK
*
*Corresponding author
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Abstract

A new fossil ricinuleid, Curculioides bohemondi n. sp., from the Pennsylvanian Energy Shale of Illinois is described from a single specimen. It is the largest ricinuleid species yet described, living or extinct. The Energy Shale represents a new geographic locale for fossil ricinuleids, a sparsely distributed group. The species is distinguished from other members within the genus by the possession of very large (0.09 mm) carapace tubercles at a very low (30 mm-2) density. Statistical analyses are performed on extant and fossil ricinuleids to determine how their tubercles change throughout ontogeny, culminating in the recovery of a new ontogenetically stable diagnostic character: the tubercle coefficient (a measure of the size of the tubercles relative to body size).

UUID: http://zoobank.org/aa9f2de5-c49d-4f70-bba5-db12fdee406f.

Type
Articles
Information
Journal of Paleontology , Volume 95 , Issue 3 , May 2021 , pp. 601 - 612
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Copyright
Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Paleontological Society

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