Abstract:

The late Permian reefs are distributed in Chengxian, Guiyang and Chenxi Counties in southern Hunan province. Reefs in Bangxian and Guiyang are patch reefs developed along Chengru shallow sea. Reefs in Chenxi are bioherms, undeveloped patch reefs. The reefs in both sites occur in the late Permian Changxing Formation. A lot of samples of fossils and rocks have been collected while surveying 8 reef composite sections in southern Hunan. We find that the most important frame-building organisms are calcisponges, just as other Permian reefs in southern China. By systematically researching Inozoans, one of the important frame-building calcisponges, it is thought that the water system and fibres might be important evidence in classification. Twelve species and 8 genera of Inozoans including one new species, one comparative species and one undefined species are found, and some species are newly classified.

Key words: reefs, Inozoan, new species, comparative species, Hunan