AUTHOR=Song Zuchen , Guo Junfeng , Han Jian , Van Iten Heyo , Qiang Yaqin , Peng Jiaxin , Sun Jie , Zheng Yajuan , Huang Xinyao , Zhang Zhifei 

TITLE=A new species of Decimoconularia (Cnidaria, Medusozoa) from the Lower Cambrian of South China

JOURNAL=Frontiers in Earth Science

VOLUME=10

YEAR=2023

URL=https://www.frontiersin.org/journals/earth-science/articles/10.3389/feart.2022.1048800

DOI=10.3389/feart.2022.1048800

ISSN=2296-6463

ABSTRACT=<p>Hexangulaconulariids, a family of biradially symmetrical medusozoan cnidarians, have been widely reported from the Lower Cambrian of South China. The four currently recognized genera of hexangulaconulariids differ from each other mainly in the number of faces in the abapical region of the periderm. However, previously published illustrations of the monospecific type genus, <italic>Hexangulaconularia</italic>, clearly show two distinct morphotypes, one with six faces and the other with 10. Specimens with 10 faces are herein reassigned to the genus <italic>Decimoconularia</italic>. In addition, the new species <italic>D. anisfacialis</italic> is described from the Kuanchuanpu Formation (Cambrian Fortunian Stage) in the Kuanchuanpu and Shizhonggou sections in Ningqiang County, southern Shaanxi Province, China. Also described are additional specimens of <italic>H. formosa</italic> from the same formation in the Zhangjiagou section in Xixiang County, southern Shaanxi Province, and from Member 2 of the Yanjiahe Formation (Cambrian Fortunian Stage) in western Hubei Province. The discovery of <italic>D</italic>. <italic>anisfacialis</italic> extends the known stratigraphical range of <italic>Decimoconularia</italic>, now composed of two species, downward from Cambrian Stage 2 into the Fortunian Stage. Additionally, certain specimens previously assigned to <italic>H</italic>. <italic>formosa</italic> are reassigned to <italic>D. anisfacialis</italic>. The diagnoses of <italic>Hexangulaconularia</italic>, <italic>Decimoconularia</italic>, and Hexangulaconulariidae are emended accordingly. In accordance with the rule of time priority, the previously designated type genus and species, <italic>Hexaconularia</italic> He and Yang, 1986 and <italic>Hexaconularia sichuanensis</italic> He and Yang, 1986, are replaced herein by <italic>Hexangulaconularia</italic> He, in Xing et al., 1983.</p>