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Biodiversity, systematics, and new taxa of cladid crinoids from the Ordovician Brechin Lagerstätte

Published online by Cambridge University Press:  29 November 2019

David F. Wright Open the ORCID record for David F. Wright [Opens in a new window] ,
Selina R. Cole  and
William I. Ausich Open the ORCID record for William I. Ausich [Opens in a new window]
David F. Wright
Affiliation:
Division of Paleontology, American Museum of Natural History, Central Park West at 79th St., New York, NY10024, USA , Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA
Selina R. Cole
Affiliation:
Division of Paleontology, American Museum of Natural History, Central Park West at 79th St., New York, NY10024, USA , Department of Paleobiology, National Museum of Natural History, Smithsonian Institution, Washington, D.C., USA
William I. Ausich
Affiliation:
School of Earth Sciences, 125 South Oval Mall, Columbus, OH43210, USA
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Abstract

Upper Ordovician (Katian) strata of the Lake Simcoe region of Ontario record a spectacularly diverse and abundant echinoderm fauna known as the Brechin Lagerstätte. Despite recognition as the most taxonomically diverse Katian crinoid paleocommunity, the Brechin Lagerstätte has received relatively little taxonomic study since Frank Springer published his classic monograph on the “Kirkfield fauna” in 1911.

Using a new collection of exceptionally preserved material, we evaluate all dicyclic inadunate crinoids occurring in the Brechin Lagerstätte, which is predominantly comprised of cladids (Eucladida and Flexibilia). We document 15 species across 11 genera, including descriptions of two new genera and four new species. New taxa include Konieckicrinus brechinensis n. gen. n. sp., K. josephi n. gen. n. sp., Simcoecrinus mahalaki n. gen. n. sp., and Dendrocrinus simcoensis n. sp.

Although cladids are not commonly considered major components of the Early Paleozoic Crinoid Macroevolutionary Fauna, which is traditionally conceived as dominated by disparids and diplobathrid camerates, they are the most diverse major lineage of crinoids occurring in the Brechin Lagerstätte. This unexpected result highlights the important roles of specimen-based taxonomy and systematic revisions in the study of large-scale diversity patterns.

UUID: http://zoobank.org/09dda7c2-f2c5-4411-93be-3587ab1652ab

Type
Articles
Information
Journal of Paleontology , Volume 94 , Issue 2 , March 2020 , pp. 334 - 357
Copyright
Copyright © 2019, The Paleontological Society

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