A latest Permian non-reef calcisponge fauna from Laibin, Guangxi, southern China and its significance

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Abstract A calcisponge fauna occurs in latest Permian Conodont Clarkina meishanensis yini zone of the sequence exposed in the vicinity of Laibin, Guangxi Province, southern China. The fauna is dominated by one thalamid species, Amblysiphonella vesiculosa de Koninck, 1863, and one new sclerosponge 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., Polycystocoelia 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 assemblage is interpreted as not a reefal fauna. The water depth at which they dwelled was less than 105 m, and more probably less than 40 m. Its occurrence indicates a significant sea-level drop at the close of Late Permian Changhsingian Stage.

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Key words: Upper Permian Calcisponge Laibin Palaeoecology Sclerosponge Thalamid sponge

Received: 18 November 2015

Corresponding Authors: E-mail address: geonag@gamil.com.

Cite this article:

. A latest Permian non-reef calcisponge fauna from Laibin, Guangxi, southern China and its significance[J]. Journal of Palaeogeography, 2017, 6(1): 60-68.

URL:

http://www.journalofpalaeogeography.org/EN/ OR http://www.journalofpalaeogeography.org/EN/Y2017/V6/I1/60


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