Revision of Irvingella tropica Opik 1963 from Australia and related species from North America; implications for correlation of the base of the Jiangshanian Stage (Cambrian, Furongian)

Stephen R Westrop; Jonathan M Adrain

Back

Revision of Irvingella tropica Opik 1963 from Australia and related species from North America; implications for correlation of the base of the Jiangshanian Stage (Cambrian, Furongian)

Journal article

Peer reviewed

Revision of Irvingella tropica Opik 1963 from Australia and related species from North America; implications for correlation of the base of the Jiangshanian Stage (Cambrian, Furongian)

Stephen R Westrop and Jonathan M Adrain

Australasian palaeontological memoirs, Vol.49, pp.395-432

2016

View Online

Abstract

'Irvingella angustilimbata' Kobayashi 1938 from Laurentian North America has been proposed as an auxiliary index species for the base of the Upper Cambrian global Jiangshanian Stage, and also has been recorded from North China, South China and Siberia. 'Irvingella tropica' Opik 1963 from Queensland, Australia has been treated as a junior synonym of I. angustilimbata. However, study of types and new material shows that 'I. angustilimbata' and 'I. tropica' are distinct species that are discriminated by both cranidial and pygidial characters; reports of 'I. angustilimbata' outside of Laurentia are at best doubtful. Restudy of poorly preserved, sandstone internal molds that constitute the type material of 'I. major' Ulrich and Resser leads us to consider the species to be a 'nomen dubium'; reports of this species outside of Laurentia are also doubtful. 'Irvingella' media Resser 1942 and 'I. deckeri' Resser 1942, formerly considered to be synonyms of I. major, are readily diagnosable, valid species. 'Irvingella orrensis' from the Orr Formation of Utah is new.

Arthropoda

Australasia

Australia

Cambrian

correlation

Furongian

Invertebrata

Invertebrate paleontology

Irvingella

Irvingella angustilimbata

Irvingella deckeri

Irvingella major

Irvingella media

Irvingella orrensis

Irvingella tropica

Jiangshanian

morphology

Nevada

new names

Orr Formation

Paleozoic

Queensland Australia

revision

synonymy

taxonomy

Trilobita

Trilobitomorpha

type specimens

United States

Upper Cambrian

Utah

Details

Title: Subtitle: Revision of Irvingella tropica Opik 1963 from Australia and related species from North America; implications for correlation of the base of the Jiangshanian Stage (Cambrian, Furongian)
Creators: Stephen R Westrop - University of Oklahoma
Jonathan M Adrain
Contributors: John R Laurie (Editor) - Geoscience Australia
Ian G Percival (Editor)
James B Jago (Editor)
John R Paterson (Editor)
Glenn A Brock (Editor)
Resource Type: Journal article
Publication Details: Australasian palaeontological memoirs, Vol.49, pp.395-432
Publisher: Australasian Palaeontologists
ISSN: 2205-8877
Alternative title: Cambro-Ordovician studies; VI
Language: English
Date published: 2016
Academic Unit: Earth and Environmental Sciences
Record Identifier: 9984240780002771

Metrics

8 Record Views