The missisquoiid trilobite Parakoldinioidia Endo 1937 in the uppermost Cambrian of Oklahoma and Texas, and its biostratigraphic significance

Stephen R Westrop; Jonathan M Adrain

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Journal article

The missisquoiid trilobite Parakoldinioidia Endo 1937 in the uppermost Cambrian of Oklahoma and Texas, and its biostratigraphic significance

Stephen R Westrop and Jonathan M Adrain

Memoir ... of the Association of Australasian Palaeontologists, Vol.45, pp.117-152

2014

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Abstract

Missisquoiid trilobites are widespread in Laurentian North America but most occurrences have been reported under a single name, 'Missisquoia typicalis' Shaw 1951 (now = 'Parakoldinioidia stitti' Fortey 1983). The base of the 'Parakoldinioidia' Zone (= 'Missisquoia typicalis' Subzone of older publications) is usually defined by the first appearance of the eponymous genus. In central Texas, the type area of the zone, three species have been recorded, and only one species is reported from correlative strata in Oklahoma. Restudy of archival collections from southern Oklahoma made by J.H. Stitt, as well as type and figured material from Texas and western Canada, revealed unexpected diversity of missisquoiid species. Our revision shows that there are at minimum ten species of 'Parakoldinioidia' and three species of 'Lunacrania' recorded in the uppermost Furongian successions of the southern Midcontinent and the southern Canadian Rocky Mountains. This indicates that Missisquoiidae underwent a significant radiation following the extinction interval at the base of the 'Eurekia apopsis' Zone. It also demonstrates the potential for a high-resolution species based zonation of at least regional utility. New species are 'Parakoldinioidia akerfeldti', 'P. lindgreni', 'P. mendezi', 'P. lopezi' and 'P. akessoni'; three additional new species are placed in open nomenclature.

Arthropoda

biostratigraphy

biozones

Cambrian

Canada

Invertebrata

Invertebrate paleontology

Lunacrania

migration

Missisquoia

Missisquoia typicalis

Missisquoiidae

morphology

new taxa

Oklahoma

Paleozoic

Parakoldinioidia

Parakoldinioidia akerfeldti

Parakoldinioidia akessoni

Parakoldinioidia indgreni

Parakoldinioidia lopezi

Parakoldinioidia mendezi

Parakoldinioidia stitti

revision

species diversity

taxonomy

Texas

Trilobita

Trilobitomorpha

type localities

type specimens

United States

Upper Cambrian

Western Canada

Details

Title: Subtitle: The missisquoiid trilobite Parakoldinioidia Endo 1937 in the uppermost Cambrian of Oklahoma and Texas, and its biostratigraphic significance
Creators: Stephen R Westrop - Oklahoma Museum of Natural History Norman, OK USA United States
Jonathan M Adrain
Contributors: John R Laurie (Editor) - Geoscience Australia
John R Paterson (Editor)
Glenn A Brock (Editor)
Resource Type: Journal article
Publication Details: Memoir ... of the Association of Australasian Palaeontologists, Vol.45, pp.117-152
Publisher: Association of Australasian Palaeontologists
ISSN: 0810-8889
Alternative title: Cambro-Ordovician studies; V
Language: English
Date published: 2014
Academic Unit: Earth and Environmental Sciences
Record Identifier: 9984229175002771

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