The Cambrian trilobite 'Rhyssometopus', with taxonomic revision of Guzhangian species from Queensland, Australia

Title
The Cambrian trilobite 'Rhyssometopus', with taxonomic revision of Guzhangian species from Queensland, Australia
Publication Date
2011
Author(s)
Hally, Lee Ann
Type of document
Journal Article
Language
en
Entity Type
Publication
Publisher
Geological Society of Australia Inc
Place of publication
Australia
UNE publication id
une:13203
Abstract
A morphometric (bivariate) analysis of middle Cambrian (Series 3; Guzhangian) species of the trilobite 'Rhyssometopus' from north-western Queensland is conducted. Results show that the species 'Rhyssometopus rhyssometopus' Öpik, 1967, 'R. princeps' Öpik, 1967, 'R. rugiceps' Öpik, 1967, and 'R. neuter' Öpik, 1967 cannot be differentiated on the basis of linear dimensions previously used by Öpik (1967) as diagnostic characters. Nonlinear characters are found to be more reliable for differentiating the species of 'Rhyssometopus'. The type species, 'R. rhyssometopus', is herein considered a senior subjective synonym of 'R. princeps' and 'R. rugiceps'. The erection of the subgenus 'Rostrifinis' is also found to be unwarranted. The occurrence of all 'Rhyssometopus' species from Australia, Antarctica and China is reviewed, and a taxonomic revision provides emended diagnoses for the following valid species: 'R. rhyssometopus' Öpik, 1967, 'R. neuter' Öpik, 1967, 'R. nitidus' Duan, 2004, 'R. rostrifinis' Öpik, 1967, 'R. thielei' (Chapman, 1911), and 'R. zhongguoensis' Zhou, 1977. The family Rhyssometopidae is also discussed, with membership consisting of the following genera: 'Rhyssometopus', 'Plectrifer', 'Qiandongaspis' and 'Tasmana'.
Link
Citation
Memoirs of the Association of Australasian Palaeontologists, v.42, p. 175-191
ISSN
0810-8889
2205-8877
Start page
175
End page
191

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