New pliomerid trilobite genus Lemureops from the Lower Ordovician (Ibexian; Tulean, Blackhillsian) of western Utah, USA

Neo E. B McAdams; Jonathan M Adrain

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New pliomerid trilobite genus Lemureops from the Lower Ordovician (Ibexian; Tulean, Blackhillsian) of western Utah, USA

Journal article

Peer reviewed

New pliomerid trilobite genus Lemureops from the Lower Ordovician (Ibexian; Tulean, Blackhillsian) of western Utah, USA

Neo E. B McAdams and Jonathan M Adrain

Memoir ... of the Association of Australasian Palaeontologists, Vol.37, pp.491-540

2009

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Abstract

Species of Lemureops gen. nov. (type species: L. kilbeyi sp. nov.) are common members of faunal assemblages from the Psalikilus pikum, Strigigenalis plicolabeona, Carolinites nevadensis and Presbynileus ibexensis trilobite zones in the upper Fillmore Formation of the Ibex area, western Utah. The genus is defined by several striking apomorphies, including a long, subtriangular anterior border; large subtriangular to reniform palpebro-ocular ridges; a wide, shallow, lacunate axial furrow along the glabella; an anteriorly prominent and posteriorly reduced eye socle; and a pygidium with a strongly tapered posterior outline. Lemureops is likely the sister taxon of Pseudocybele Ross, 1951a, but this hypothesis must be tested in a broader phylogenetic context once Pseudocybele is revised and related taxa presently assigned to Hintzeia Harrington, 1957, and Protopliomerella Harrington, 1957, are described and revised. New species in addition to the type are L. willsonpiperi, L. ploogi and L. koppesi; Pseudocybele lemurei Hintze, 1953, is reassigned to Lemureops. Two additional species are new, but insufficiently known for formal naming.

Arthropoda

biostratigraphy

Blackhillsian

description

Fillmore Formation

Ibex Utah

Ibexian

Invertebrata

Invertebrate paleontology

Lemureops

Lemureops kilbeyi

Lemureops koppesi

Lemureops ploogi

Lemureops willsonpiperi

Lower Ordovician

Millard County Utah

morphology

new taxa

Ordovician

Paleozoic

phylogeny

Pliomeridae

Pseudocybele

Pseudocybele lemurei

revision

taxonomy

Trilobita

Trilobitomorpha

Tulean

United States

Utah

western Utah

Details

Title: Subtitle: New pliomerid trilobite genus Lemureops from the Lower Ordovician (Ibexian; Tulean, Blackhillsian) of western Utah, USA
Creators: Neo E. B McAdams - University of Iowa
Jonathan M Adrain
Contributors: J. R Laurie (Editor)
G. A Brock (Editor)
John R Paterson (Editor)
Resource Type: Journal article
Publication Details: Memoir ... of the Association of Australasian Palaeontologists, Vol.37, pp.491-540
Publisher: Association of Australasian Palaeontologists
ISSN: 0810-8889
Alternative title: Cambro-Ordovician studies III
Language: English
Date published: 2009
Academic Unit: Earth and Environmental Sciences
Record Identifier: 9984240789602771

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