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Development of the early Cambrian oryctocephalid trilobite Oryctocarella duyunensis from western Hunan, China

Published online by Cambridge University Press:  17 March 2021

Tao Dai Open the ORCID record for Tao Dai [Opens in a new window] ,
Nigel C. Hughes Open the ORCID record for Nigel C. Hughes [Opens in a new window] ,
Xingliang Zhang Open the ORCID record for Xingliang Zhang [Opens in a new window]  and
Shanchi Peng
Tao Dai*
Affiliation:
State Key Laboratory for Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, Northwest University, Xian, 710069, P.R. China ,
Nigel C. Hughes
Affiliation:
Department of Earth and Planetary Sciences, University of California, Riverside, CA92521, USA, and Geological Studies Unit, Indian Statistical Institute, 203 B.T. Road, Kolkata, 700108, India
Xingliang Zhang
Affiliation:
State Key Laboratory for Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, Northwest University, Xian, 710069, P.R. China ,
Shanchi Peng
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy (Nanjing Institute of Geology and Palaeontology, CAS), Nanjing, Jiangsu, 210008, P.R. China
*
*Corresponding author
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Abstract

Abundant articulated specimens of the oryctocarine trilobite Oryctocarella duyunensis from the lower Cambrian (Stage 4, Series 2) Balang Formation at the Bulin section in western Hunan Province, South China, permit the description of all meraspid degrees. The maximum number of thoracic segments observed in this collection is 11. Meraspid growth was accompanied by progressive and gradual change in overall form, and this animal showed an homonymously segmented trunk with variation in the number of pygidial segments during ontogeny. Such variation permits a variety of plausible explanations, but a model of successive instars defined by the number of thoracic segments, and in suborder by the number of pygidial segments, is highly unlikely to explain the growth pattern because it would result in the loss of trunk segments between some instars. Degree-based ontogenetic staging is compatible with the variation observed.

Type
Articles
Information
Journal of Paleontology , Volume 95 , Issue 4 , July 2021 , pp. 777 - 792
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Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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