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A new aglaspidid-like euarthropod from the lower Cambrian Emu Bay Shale of South Australia

Published online by Cambridge University Press:  15 January 2016

GREGORY D. EDGECOMBE ,
JOHN R. PATERSON  and
DIEGO C. GARCÍA-BELLIDO
GREGORY D. EDGECOMBE*
Affiliation:
Department of Earth Sciences, The Natural History Museum, Cromwell Road, London SW7 5BD, UK
JOHN R. PATERSON
Affiliation:
Palaeoscience Research Centre, School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia
DIEGO C. GARCÍA-BELLIDO
Affiliation:
School of Biological Sciences & Environment Institute, University of Adelaide, SA 5005, Australia Earth Sciences Section, South Australian Museum, North Terrace, Adelaide, SA 5000, Australia
*
†Author for correspondence: g.edgecombe@nhm.ac.uk
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Abstract

A new euarthropod from the Emu Bay Shale (Cambrian Series 2, Stage 4) on Kangaroo Island, South Australia, is a rare component of this Konservat-Lagerstätte. The two known specimens of Eozetetes gemmelli gen. et sp. nov., in combination, depict a non-biomineralized euarthropod with a relatively short cephalic shield lacking dorsal eyes and bearing a flagelliform antenna, 18 trunk segments with broad tergopleurae and paired axial nodes/carinae, and an elongate, styliform tailspine. The new species compares most closely with taxa in the putative clade Vicissicaudata, which groups Aglaspidida, Cheloniellida and Xenopoda. A ring-like terminal tergite in E. gemmelli corresponds to the caudal tergite in cheloniellids and xenopodans. Incorporating Eozetetes into recent character sets for Cambrian euarthropods supports close affinities to either Emeraldella or to aglaspidids, but several plesiomorphic character states are inconsistent with membership in Aglaspidida sensu stricto. Eozetetes is among the earliest of various Cambrian taxa informally referred to as ‘aglaspidid-like euarthropods’.

Keywords

EuarthropodaEozetetes gemmelliEmeraldellaAglaspididaVicissicaudata
Type
Original Articles
Information
Geological Magazine , Volume 154 , Issue 1 , January 2017 , pp. 87 - 95
Copyright
Copyright © Cambridge University Press 2016 

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