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A ten-faced hexangulaconulariid from Cambrian Stage 2 of South China

Published online by Cambridge University Press:  29 March 2021

Junfeng Guo Open the ORCID record for Junfeng Guo [Opens in a new window] ,
Jian Han Open the ORCID record for Jian Han [Opens in a new window] ,
Heyo Van Iten Open the ORCID record for Heyo Van Iten [Opens in a new window] ,
Zuchen Song ,
Yaqin Qiang ,
Wenzhe Wang ,
Zhifei Zhang Open the ORCID record for Zhifei Zhang [Opens in a new window]  and
Guoxiang Li
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> Shaanxi Key Laboratory of Early Life and Environment, State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, P.R. China , State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing210008, P.R. China
Jian Han*
Affiliation:
Shaanxi Key Laboratory of Early Life and Environment, State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, P.R. China ,
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:
Shaanxi Key Laboratory of Early Life and Environment, State Key Laboratory of Continental Dynamics, Department of Geology, Northwest University, Xi'an 710069, P.R. China ,
Guoxiang Li
Affiliation:
State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology and Center for Excellence in Life and Paleoenvironment, Chinese Academy of Sciences, Nanjing210008, P.R. China
*
*Corresponding Author.
*Corresponding Author.
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Abstract

Hexangulaconulariids (Cambrian stages 1–2) are an extinct group of medusozoan polyps having a biradially symmetrical, fan-shaped periderm that is distinct from those of medusozoan polyps showing three-, four-, five-, or six-fold radial symmetry. Hexangulaconulariids exhibit substantial variation in gross morphology, including variation in the number of faces on each of the two major sides of the periderm. An intermediate taxon of hexangulaconulariids with ten faces (five on each major side) was expected. Here we describe a new hexangulaconulariid, Decimoconularia isofacialis new genus new species from Bed 5 of the Yanjiahe Formation (Cambrian Stage 2) in the Three Gorges area of Hubei Province, China. The new taxon differs from other hexangulaconulariids (Arthrochites, Hexaconularia, and Septuconularia) mainly in possessing a total of ten faces. The two lateral margins are each marked by a ridge in about the apertural half of the periderm and by a collinear furrow in about the apical half, while the five faces on each major side are bounded by a furrow in about the apertural half and by a collinear ridge in about the apical half. Among hexangulaconulariids, Decimoconularia and Septuconularia may be more closely related to each other than either genus is to Arthrochites or Hexaconularia.

UUID: http://zoobank.org/ca270a3b-25ee-4d1f-bdeb-91a963370e70

Type
Articles
Information
Journal of Paleontology , Volume 95 , Issue 5 , September 2021 , pp. 957 - 964
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Copyright
Copyright © The Author(s), 2021. Published by Cambridge University Press on behalf of The Paleontological Society

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