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A three-dimensionally preserved aglaspidid euarthropod with a calcitic cuticle from the Ordovician of China

Published online by Cambridge University Press:  24 April 2017

DEREK J. SIVETER ,
RICHARD A. FORTEY ,
XUEJIAN ZHU  and
ZHIYI ZHOU
DEREK J. SIVETER*
Affiliation:
Earth Collections, Oxford University Museum of Natural History, Parks Road, Oxford OX1 3PW, UK Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, UK
RICHARD A. FORTEY
Affiliation:
Department of Earth Sciences, The Natural History Museum, Cromwell Road, South Kensington, London SW7 5BD, UK
XUEJIAN ZHU
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China
ZHIYI ZHOU
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, People's Republic of China
*
†Author for correspondence: derek.siveter@oum.ox.ac.uk
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Abstract

Aglaspidid euarthropods are usually preserved as flattened carapaces. We here describe a new species and genus, Gogglops ensifer, from the Ordovician Shaanxi Province, China, which shows the best three-dimensional (3D) preservation yet discovered. We show that the cuticle was originally composed of calcium carbonate, except for the visual surfaces of the eyes which were probably originally organic but have been selectively phosphatized. A review is given of the problems pertaining to the original nature of the aglaspidid cuticle. Gogglops is probably closely related to certain poorly known aglaspidid genera from Ordovician deposits of the Siberian Platform. Phylogenetic analysis indicates that the new genus is closely related to Aglaspis itself, and securely nested within the clade Aglaspidida.

Keywords

AglaspididacuticleOrdovicianChina
Type
Original Article
Information
Geological Magazine , Volume 155 , Issue 7 , October 2018 , pp. 1427 - 1441
Copyright
Copyright © Cambridge University Press 2017 

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