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Bradoriida (Arthropoda) from the early Cambrian of North Greenland

Published online by Cambridge University Press:  03 November 2011

David J. Siveter
Affiliation:
Department of Geology, University of Leicester, Leicester, LE17RH, UK
Mark Williams
Affiliation:
Department of Geology, University of Leicester, Leicester, LE17RH, UK
John S. Peel
Affiliation:
Institute of Earth Sciences, Department of Historical Geology and Palaeontology, University of Uppsala, Norbyvägen 22, S-752 36 Uppsala, Sweden
Derek J. Siveter
Affiliation:
The University Museum, Parks Road, Oxford, OX1 3PW, UK

Abstract

Marine shelf siliciclastics of the early Cambrian Buen Formation of North Greenland have yielded the earliest abundant, well localised Bradoriida (Arthropoda) from the Laurentian part of North America: the shelf-dwelling Petrianna gen. nov. Petrianna apparently has a fairly rigid, phosphatic shell. Its assignment to the Cambriidae, a family markedly dissimilar morphologically from the phosphatocopines (the only Bradoriida hitherto regarded as having a primary phosphatic shell), implies rejection of the criterion of carapace composition in the ordinal/subordinal classification of Bradoriida.

Petrianna confirms the Bradoriida as a consistent component of the earliest arthropod faunas. Cambriids are currently known only from the early Cambrian of Greenland, Siberia and China and offer potential for correlation. Cambriid occurrences span parts of the Redlichiid, Olenellid and Bigotinid trilobite faunal realms but are known only from tropical/subtropical regions, thus indicating possible palaeolatitudinal controls on their distribution.

Type
Research Article
Copyright
Copyright © Royal Society of Edinburgh 1995

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