A calcisponge fauna occurs in uppermost Permian Conodont Clarkina meishanensis yini zone of the sequence exposed in the vicinity of Laibin, Guangxi Zhuang Autonomous Region, southern China. The fauna is dominated by o...A calcisponge fauna occurs in uppermost Permian Conodont Clarkina meishanensis yini zone of the sequence exposed in the vicinity of Laibin, Guangxi Zhuang Autonomous Region, southern China. The fauna is dominated by one thalamid species, Arnblysiphonella vesiculosa de Koninck, 1863, and one new scterosponge genus and species, Radiofibrosclera laibinensis gen. et sp. nov. They are associated with a few other accessory species, including the thalamid sponges Amblysiphonella laibinensis Deng, 1981, Colospongia sp., Polvcystocoelia sp., and the inozoan sponge Acoelia discontinua sp. nov. Though the individuals are abundant, the species diversity is very low. Without common calcisponge components of Changhsingian reefal faunas, the assembtage is interpreted as not a reefal fauna. The water depth at which they dwelled was less than 105 m, and more probably tess than 40 m. Its occurrence indicates a significant sea-level drop at the end of Late Permian Changhsingian Age.展开更多
基金supported by the National Natural Scientific Foundation of China(No.40172007,40472015,40802001,and 41372121)the key project from Chinese Academy of Sciences(No.KZ951B1-409)
文摘A calcisponge fauna occurs in uppermost Permian Conodont Clarkina meishanensis yini zone of the sequence exposed in the vicinity of Laibin, Guangxi Zhuang Autonomous Region, southern China. The fauna is dominated by one thalamid species, Arnblysiphonella vesiculosa de Koninck, 1863, and one new scterosponge genus and species, Radiofibrosclera laibinensis gen. et sp. nov. They are associated with a few other accessory species, including the thalamid sponges Amblysiphonella laibinensis Deng, 1981, Colospongia sp., Polvcystocoelia sp., and the inozoan sponge Acoelia discontinua sp. nov. Though the individuals are abundant, the species diversity is very low. Without common calcisponge components of Changhsingian reefal faunas, the assembtage is interpreted as not a reefal fauna. The water depth at which they dwelled was less than 105 m, and more probably tess than 40 m. Its occurrence indicates a significant sea-level drop at the end of Late Permian Changhsingian Age.
