STUDY ON NEW ATYID SHRIMPS (DECAPODA, CARIDEA) FROM GUANGXI, CHINA

A large number of freshwater atyid shrimps were collected from Guangxi Zhuang Autonomous Region by the authors during the past years. The shrimps belong to two genus, Four are described as new, three of which live in the limestone cave. The type specimens of the new speeies are kept in Shanghai Fisheries University. The diagnosis of the new species is given below. Typtdocaridina liui sp. nov. The rostrum is very short and reaches to the extremity of the eyes. The dorsal border bears 6 teeth, five of which are placed on the carapace behind the orbit; the lower border is without tooth. The eyes are egg-shaped and largely degenerated, bear only a few small round dark pigments, which are separated from each other on the outer antero-lateral corner. Unfortunately, the male of this new species is unknown. This new species is named in honour of Prof. R. Y. Liu,Type locality: Paobingyan Cave. Lingui County. Caridina caverrdcola sp. nov. The rostrum is rather wide, and reaches beyond the antennular peduncle; its tip turned upwards. The dorsal border bears 28—36 teeth, 7—10 of which are placed on the carapace behind the orbit. The ventral border bears 20—24 teeth; its distal 1/5 is devoid of teeth. The eyes are well developed, with a globular, well-pigmented cornea. Remarks: The rostral shape and teeth distribution of the new species closely resemble those of Caridina rubella Fujino et Shokita, but the carpus of the 1st and 2nd ehelipeds of the new species is shorter and coarser. This clearly distinguishes the former from the latter. Type locality: Lenggu Cave, Duan County. Caridina guangxiensis sp. nov. The rostrum is very long and slender, andreaches distinctly beyond the antennular peduncle by more than half of its length. The tip is curved upwards. The dorsal margin bears 9—14 teeth, 5—7 of which are placed on the carapace behind the orbit; the distal half is devoid of teeth. The lower margin is serrated, bearing 41—48 teeth. The eyes are well developed, with a globular, well-pigmented cornea. The endopod of the 1st pleopod in the male is kidney-like. The appendix maseulina of the 2nd pleopod is short rod-like. The appendix interna is large, reaching about distal part of the appendix maseulina. Remarks:The rostrum of the new species is very long and slender, the number of teeth on the upper margin is fewer, and there are more teeth on the lower margin. These characters closely resemble those of Caridina gracilirostris de Man, but the new species has no subapical tooth, and more teeth are situated on the carapace behind orbit. These characters differ from those in the latter. Type locality :Dawangshan Cave, Guilin City. Caridina sphyrapoda sp. nov. The rostrum is long, reaching beyond the extremity of the antennular peduncle, its dorsal border bears 16—17 teeth, and the ventral border bears 8—10 teeth. The stylocerite is long and reaches beyond the end of the basal segment of the antennular peduncle. The 2nd segment of the antennular peduncle is about twice as long as the 3rd segment. The endopod of the 1st male pleopod is kidney—like, the inner border is deeply concave and the basal portion bears a tongue—like protrusion,with many long spinules at the extreme portion. Remarks: The rostrum of the new species is long and the teeth are more in number, the stylocerite is long and closely resembles those of Caridina heterodactyla Liang et Yan, but differs from the latter in the following feature: 1. the 2nd segment of the antennular peduncle is about twice as long as the 3rd segment; 2. the dactylus of the 5th peraeopod is longer, and the comb—like spinules are more in number;3, the shape and structure of the endopod of the 1st male pleopod and the appendix masculina are different. Type locality:Longdonghe,Laibin County.