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First report of acrotretoid brachiopod shell beds in the lower Cambrian (Stage 4) Guanshan Biota of eastern Yunnan, South China

Published online by Cambridge University Press:  09 September 2020

Xiaolin Duan ,
Yue Liang ,
Lars E. Holmer  and
Zhifei Zhang Open the ORCID record for Zhifei Zhang [Opens in a new window]
Xiaolin Duan
Affiliation:
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, and Department of Geology, Northwest University, Xi'an, 710069, China ,
Yue Liang
Affiliation:
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, and Department of Geology, Northwest University, Xi'an, 710069, China , Department of Earth Sciences, Paleobiology, Uppsala University, Villavägen 16, 752 36Uppsala, Sweden
Lars E. Holmer
Affiliation:
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, and Department of Geology, Northwest University, Xi'an, 710069, China , Department of Earth Sciences, Paleobiology, Uppsala University, Villavägen 16, 752 36Uppsala, Sweden
Zhifei Zhang*
Affiliation:
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, and Department of Geology, Northwest University, Xi'an, 710069, China ,
*
*corresponding author
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Abstract

Brachiopod shell accumulations are abundant and diverse in the lower Cambrian strata of Yunnan Province, South China, but most commonly they are composed of linguloid and acrotheloid brachiopods. Here, we describe the first record of shell beds with high-density accumulations of microscopic acrotretoid brachiopods (usually <2 mm in width) in the muddy deposits of the Wulongqing Formation (Guanshan Biota, Cambrian Stage 4) in the Wuding area of Yunnan Province. The acrotretoid shell beds from the Wulongqing Formation vary from thin mm-thick pavements to more well-developed beds, several centimeters thick. The occurrence of remarkably rich acrotretoid shell beds indicates that microscopic lingulates began to exert an important role in hardening and paving the soft-substrate seafloor during the early Cambrian evolution of Phanerozoic “mixgrounds.” The new Guanshan material is referred to a new species, Linnarssonia sapushanensis n. sp., which differs from other species of Linnarssonia mainly in having a well-developed internal pedicle tube, as well as a relatively longer dorsal median septum. The occurrence of Linnarssonia sapushanensis n. sp. in the Wulongqing Formation in eastern Yunnan extend the oldest record of the genus on the Yangtze Platform of South China back to at least Cambrian Stage 4.

UUID: http://zoobank.org/3e0c3878-6ce2-4eed-87bf-e39647c310c4

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Journal of Paleontology , Volume 95 , Issue 1 , January 2021 , pp. 40 - 55
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Copyright © The Author(s), 2020. Published by Cambridge University Press on behalf of The Paleontological Society

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