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A new tetraradial olivooid (Medusozoa) from the lower Cambrian (Stage 2) Yanjiahe Formation, South China

Published online by Cambridge University Press:  27 December 2019

Junfeng Guo
Affiliation:
School of Earth Science and Resources, Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an 710054, P.R. China , <757542074@qq.com>, <2695489023@qq.com>, <512718116@qq.com>
Jian Han*
Affiliation:
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, Department of Geology, Northwest University, 229 Taibai Road, Xi'an 710069, P.R. China , , <531626765@qq.com>, <55718471@qq.com>
Heyo Van Iten*
Affiliation:
Department of Geology, Hanover College, Hanover, Indiana47243, USA Department of Invertebrate Paleontology, Cincinnati Museum Center, 1301 Western Avenue, Cincinnati, Ohio45203, USA
Zuchen Song
Affiliation:
School of Earth Science and Resources, Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an 710054, P.R. China , <757542074@qq.com>, <2695489023@qq.com>, <512718116@qq.com>
Yaqin Qiang
Affiliation:
School of Earth Science and Resources, Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an 710054, P.R. China , <757542074@qq.com>, <2695489023@qq.com>, <512718116@qq.com>
Wenzhe Wang
Affiliation:
School of Earth Science and Resources, Key Laboratory of Western China's Mineral Resources and Geological Engineering, Ministry of Education, Chang'an University, Xi'an 710054, P.R. China , <757542074@qq.com>, <2695489023@qq.com>, <512718116@qq.com>
Zhifei Zhang
Affiliation:
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, Department of Geology, Northwest University, 229 Taibai Road, Xi'an 710069, P.R. China , , <531626765@qq.com>, <55718471@qq.com>
Guoxiang Li
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy and Center for Excellence in Life and Paleoenvironment, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing210008, P.R. China
Yifei Sun
Affiliation:
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, Department of Geology, Northwest University, 229 Taibai Road, Xi'an 710069, P.R. China , , <531626765@qq.com>, <55718471@qq.com>
Jie Sun
Affiliation:
State Key Laboratory of Continental Dynamics, Shaanxi Key Laboratory of Early Life and Environments, Department of Geology, Northwest University, 229 Taibai Road, Xi'an 710069, P.R. China , , <531626765@qq.com>, <55718471@qq.com>
*Corresponding
*Corresponding author.
*Corresponding author.

Abstract

Octapyrgites elongatus n. gen. n. sp., a relatively rare, tetraradial olivooid (Cnidaria, Medusozoa), is described from Bed 5 of the Yanjiahe Formation (Cambrian Stage 2) near Yichang, China. Although similar to Olivooides and Quadrapyrgites from the Fortunian Stage in consisting of a partially corrugated (longitudinal) periderm with a quadrate (transverse) apical portion and V-shaped apertural lobes, O. elongatus is substantially larger than other olivooids. The elongate apical region of O. elongatus is similar to four-sided Anaconularia anomala (Barrande, 1867), though with a flat tip that may have been an adaption for a sessile mode of life. As in other olivooids, embryonic development in O. elongatus may have been direct. Last, the paucity of olivooids and the absence of pentaradial cnidarians and carinachitids in Cambrian Stage 2 indicate a marked decline in the disparity of cnidarians near the Fortunian–Cambrian Age 2 boundary, when by contrast bilaterians underwent rapid diversification.

UUID: http://zoobank.org/60acc2f9-44f8-4a97-9449-960ad76f8fff

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Copyright © 2019, The Paleontological Society

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A new tetraradial olivooid (Medusozoa) from the lower Cambrian (Stage 2) Yanjiahe Formation, South China
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