Skip to main content
Dryad logo

Data from: Disparid and hybocrinid crinoids (Echinodermata) from the Upper Ordovician (lower Katian) Brechin Lagerstätte of Ontario

Citation

Ausich, William I.; Wright, David F.; Cole, Selina R.; Koniecki, Joseph M. (2017), Data from: Disparid and hybocrinid crinoids (Echinodermata) from the Upper Ordovician (lower Katian) Brechin Lagerstätte of Ontario, Dryad, Dataset, https://doi.org/10.5061/dryad.dm67f

Abstract

The Brechin Lagerstätte (Katian, Ordovician) from the Lake Simcoe region of Ontario, Canada, contains a diverse array of echinoderms. Here, we describe seven disparid and two hybocrinid crinoids (Subclass Pentacrinoidea, Infraclass Inadunata), including a new disparid species belonging to the Anomalocrinidae (Order Homocrinida). In total, the disparids include Anomalocrinus astrictus n. sp.; Cremacrinus guttenbergensis Kolata, 1975; Cremacrinus inaequalis Billings, E., 1859; Daedalocrinus bellevillensis Billings, W.R., 1883; Eustenocrinus springeri Ulrich, 1925; Iocrinus trentonensis Walcott, 1883; and Isotomocrinus tenuis Billings, E., 1857b; and the hybocrinids include Hybocrinus tumidus Billings, E., 1857a and Hybocystites problematicus Wetherby, 1880. Previously known from only the holotype, three additional specimens of E. springeri expand our understanding of this unusual crinoid. Nomenclatural acts include the following: the recommendation of Warn and Strimple (1977), who designated Daedalocrinus kirki as a junior synonym of Daedalocrinus bellevillensis is followed; Hybocrinus pristinus Billings, E., 1858 is designated a junior synonym of Hybocrinus tumidus; and previous decisions are followed herein to retain Hybocystites eldonensis (Parks, 1908) as a junior synonym of Hybocystites problematicus. Although probably assignable to Anomalocrinus, the aberrant crinoid Glaucocrinus falconeri is designated a nomen dubium. Iocrinus similis (Billings, E., 1857a) is also designated a nomen dubium.

Usage Notes

Location

Ontario