Hexangulaconulariids,an extinct family of medusozoan small shelly fossils(SSFs),were a conspicuous component of early Cambrian,shallow marine platform communities in South China.Described herein is Septuconularia crassiformis sp.nov.from Bed 5 of the Yanjiahe Formation(Cambrian Stage 2)in the Three Gorges area of Hubei Province.The new species differs from the type and only other known species,S.yanjiaheensis,in the shape of the abapical portion and in the degree of curvature of the adapertural margin.The anatomy of the apical portion of the new species is unknown.The diagnosis of the genus Septuconularia is emended and the spatio-temporal distribution of hexangulaconulariids in South China is summarized.Finally,S.yanjiaheensis,with its slit-like aperture and very narrow transverse cross-section,may have been better adapted to the shallow platform environment than the broader S.crassiformis,which appears to have been less common than the type species.

SONG Zuchen;GUO Junfeng;HAN Jian;Heyo VAN ITEN;QIANG Yaqin;PENG Jiaxin;SUN Jie;ZHANG Zhifei

Key Laboratory of Western Mineral Resources and Geological Engineering,Ministry of Education,School of Earth Science and Resources,Chang'an University,Xi'an 710054,China;Shaanxi Key Laboratory of Early Life and Environments,Department of Geology,Northwest University,Xi'an 710069,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,Nanjing 210008,China;Department of Geology,Hanover College,Hanover,Indiana 47243,USA;Department of Invertebrate Paleontology,Cincinnati Museum Center,1301 Western Avenue,Cincinnati,Ohio 45203,USA

地质学报（英文版）

[1]SONG Zuchen;GUO Junfeng;HAN Jian;Heyo VAN ITEN;QIANG Yaqin;PENG Jiaxin;SUN Jie;ZHANG Zhifei-.A New Species of Septuconularia(Hexangulaconulariidae,Cnidaria)from Cambrian Stage 2,South China)[J].地质学报（英文版）,2022(03):757-765

Septuconularia,Hexangulaconulariidae,Cnidaria,Hexangulaconulariids,medusozoan,shelly,SSFs,crassiformis,Yanjiahe,yanjiaheensis,abapical,adapertural,emended,hexangulaconulariids

New,Species,from,Cambrian,Stage,South,China,extinct,family,small,fossils,were,conspicuous,component,early,shallow,marine,platform,communities,Described,herein,nov,Bed,Formation,Three,Gorges,area,Hubei,Province,new,species,differs,type,only,other,shape,portion,degree,curvature,margin,anatomy,unknown,diagnosis,genus,spatio,temporal,distribution,summarized,Finally,its,slit,like,aperture,very,narrow,transverse,cross,section,may,have,been,better,adapted,environment,than,broader,which,appears,less,common

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