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New well-preserved scleritomes of Chancelloriida from early Cambrian Guanshan Biota, eastern Yunnan, China

Published online by Cambridge University Press:  26 June 2018

Jun Zhao ,
Guo-Biao Li  and
Paul A. Selden
Jun Zhao
Affiliation:
State Key Laboratory of Environmental Geology and Biogeology, China University of Geosciences, Beijing, 100083, China 〈zhaojunpaleo@126.com〉, 〈liguobiao@cugb.edu.cn〉 School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China
Guo-Biao Li*
Affiliation:
State Key Laboratory of Environmental Geology and Biogeology, China University of Geosciences, Beijing, 100083, China 〈zhaojunpaleo@126.com〉, 〈liguobiao@cugb.edu.cn〉 School of Earth Sciences and Resources, China University of Geosciences, Beijing, 100083, China
Paul A. Selden
Affiliation:
Department of Geology, University of Kansas, 1457 Jayhawk Boulevard, Lawrence, KS 66045, USA 〈selden@ku.edu〉 Natural History Museum, Cromwell Road, London SW7 5BD, UK
*
*corresponding author
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Abstract

A large number of well-preserved chancelloriid scleritomes from the Guanshan biota, early Cambrian of Yunnan, China, are described as a new species, Allonnia tenuis n. sp., and provide solid evidence for the original appearance of these enigmatic animals, based on specimens compacted laterally and top-down. With the assistance of a flexible integument, chancelloriids, especially Allonnia from early and middle Cambrian, may have had the ability to partially or completely expand and contract the body, which might have played an important role in feeding. A new metazoan with single-element spines, Nidelric gaoloufangensis n. sp., is also described. Preservation and affinity are discussed. Detailed comparison of the morphology of the body and spines of this metazoan indicate that it shares many similarities with chancelloriids, of which it may be an unusual form.

UUID: http://zoobank.org/2708d95a-1fae-46fc-afea-9707ae97a4d7

Type
Articles
Information
Journal of Paleontology , Volume 92 , Issue 6 , November 2018 , pp. 955 - 971
Copyright
Copyright © 2018, The Paleontological Society 

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