THREE NEW SPECIES OF ATYID SHRIMPS (DECAPODA, CARIDEA) FROM CAVES OF GUIZHOU, CHINA

The present paper describes three new species of atyid shrimps. The specimens were collected from many caves of Libo County (25°41′N, 107°83′E) of Maolan Nature Sanctuary of Guizhou. Specimens are deposited in the Shanghai Fisheries University.Caridina caverna sp. nov. (Figs. 1-14)Rostrum reaches to the middle of 3rd segment of the antennular peduncle. The dorsal border bears 21 teeth, 7-8 of which are situated on the carapace behind the orbit. The ventral border bears 6 teeth. The eyes are degenerated, and the cornea have no pigments.The carpus of 1st pereopod is about 1.9 times as long as wide, and that of 2nd pereopod is about 4.4 times. The dactylus of 3rd pereopod bears 5-6 spinules. The propodus of 5th pereopod is about 14 times as long as wide at the extremity.Holotype ♂(03-14-1),paratype 1♀, 7 May 2002, by CHEN Hui-Min.Remarks. The present new species is closely allied to Caridina ablepsia,but differs from latter in follo- wing features: the antennal spines are smaller and pointed. The telson bears a short posteromedian tooth; the outer intermediate spinules are shorter than all other intermediate spinules; the median intermediate spinules are about as long as the inner intermediate spinules. The 3rd segment of the antennular peduncle is shorter than 2nd segment. The stylocerite is longer. The scaphocerite is narrower. The endopod of 1st maxilliped is with a projecting corner-shaped at the distally outer border. The ultimate segment of 3rd maxilliped is shorter than the penultimate segment. The carpus of 2nd pereopod is longer than the merus. The carpus of 3rd pereopod is longer. The shape and structure of the endopod of 1st male pleopod and the appendix masculina are different. Caridina acuta sp. nov. (Figs.15-29)Rostrum is shorter, and it reaches to the extremity of 1st segment to the middle of 2nd segment of the antennular peduncle. The dorsal border bears 0-2 teeth, and the ventral border is no teeth. The eyes are degenerated, the talk is shorter, and the cornea have rather developed pigments.The carpus of 1st pereopod is about 1.7 times as long as wide, and that of 2nd pereopod is about 4 times. The dactylus of 3rd pereopod bears 4 spinules. The propodus of 5th pereopod is about 13.8 times as long as wide at the extremity.Holotype ♂(03-21-1),paratypes: 1♂, 4♀♀, 8 Apr. 2003, by CHEN Hui-Min. Remarks. The present new species is closely allied to Caridina demenica,but differs from latter in following features: the rostrum is longer. The antennal spines are developed, and it is longer and pointed. The cornea have rather developed pigments.The stylocerite reaches to the extremity of 1st segment of the antennular peduncle. The merus of 3rd pereopod is about 1.7 times as long as the carpus. The propodus of 5th pereopod is about 13.8 times as long as wide at the extremity. The endopod of 1st male pleopod is expansive at the base of the inner border. The teeth of the diaeresis are more in number. Neocaridina brevidactyla sp. nov. (Figs.30-43)Rostrum reaches to the extremity of 3rd segment of the antennular peduncle. The dorsal border bears 14-18 teeth, 3-5 of which are situated on the carapace behind the orbit. The ventral border bears 3-5 teeth.The dactylus of 1st pereopod is shorter than the palm; the chela is about 1.9 times as long as wide; the carpus is about 1.2 times as long as wide. The propodus of 5th pereopod is about 3.2 times as long as the dactylus, which is about 5.3 times as long as wide. The endopod of 1st male pleopod is long oval, and about 2.3 times as long as wide; the base of the inner border bears with a arc of shorter process. The appendix masculina of 2nd pleopod is smaller and shor- ter, and the spines are less in number. The appendix interna is longer, and it reaches beyond the end of the appendix mesculina. Holotype ♀(03-16-1),paratypes: 2♀♀, 1♂, 7 May 2002, by CHEN Hui-Min.Remarks. The shape and structure of the endopod of 1st male pleopod and the appendix masculina of 2nd pleopod of the present new species are closely allied to Neocaridina gracilipoda, but differs from latter in following features: the dactylus 1st pereopod is shorter than the palm. The chela is wider, and it is about 1.9 times as long as wide. The carpus is very short and wide; it is triangular, and about 1.2 times as long as wide. The propodus of 5th pereopod is about 3.2 times as long as the dactylus; the dactylus is narrower, and it is about 5.3 times as long as wide.