31 species and subspecies of atyid shrimps belonging to four genera Caridina,Neocaridina Paracaridina and Mancicaris are found in Hunan Province,China of which 20 species and the gnus Mancicaris appear to be endemic to Hunan Province. This paper deals with the morphological character, distribution and some ecological information of 21 species of gnus Caridina . I...