Latest Permian deep-water ostracods from southwestern Guangxi, South China

Aihua Yuan,Qinglai Feng,Sylvie Crasquin-Soleau,Songzhu Gu

doi:10.1144/jm.26.2.169

Abstract

Abstract. A very diverse ostracod fauna was discovered in the latest Permian strata of the Dongpan section, southwestern Guangxi, South China. Fifty-one species belonging to twenty-eight genera were identified and described, including two new species (Bairdia dongpanensis n. sp. and Spinomicrocheilinella anterocompressa n. sp). This type of assemblage, with nineteen palaeopsychrospheric species and four pelagic species, is the first world-wide deep-water ostracod fauna reported from the latest Permian strata and the first one recorded in the Permian of China. The palaeoenvironmental analysis allows one to propose an evaluation of the bathymetry variation along the Dongpan section.

Highlights

Knowledge of Late Permian shallow-water ostracods of South China is increasing following the studies of Wang (1978), Chen & Shi (1982), Shi & Chen (1987, 2002), Yi (1992, 1993, 2004), Hao (1992, 1993, 1994) and Crasquin-Soleau & Kershaw (2005)
The ostracods were retrieved after dilute hydrofluoric acid (HF) (2% to 5%) processing, which is a special method for extracting radiolarians from cherts (Pessagno & Newport, 1972)
This paper shows that an eastwards direction of migration is possible from Indonesia to South China

Summary

INTRODUCTION

Knowledge of Late Permian shallow-water ostracods of South China is increasing following the studies of Wang (1978), Chen & Shi (1982), Shi & Chen (1987, 2002), Yi (1992, 1993, 2004), Hao (1992, 1993, 1994) and Crasquin-Soleau & Kershaw (2005). This specimen is attributed to Microcheilinella aculeata Buschmina, 1975 from the Early Carboniferous of Russia (Buschmina, 1975), South China (Wang, 1988) and Poland (Olempska, 1981, 1997) by the elongate carapace, posterior spine and the valve overlap type. Our specimens strongly resemble the juveniles of the shallow-water species Spinomicrocheilinella praespinosa Kozur, 1985 from the Abadehian (Late Permian) of Hungary in outline, but differ by a slightly compressed AB and in having a spine only in the right valve. Our specimen resembles Absina ventrorostrata Gründel, 1962 through the anterior swing and elongate valve, but differs from the latter by the posterior C-shaped ridge, the arched DB and the flattening of dorsal part of the carapace.

Palaeopsychrospheric species

Living pattern

Timor and Sicily

Findings

CONCLUSIONS