Caridina dianchiensis Liang and Yan, 1985

Ng, Y. Cai and P. K. L. & Ng, Cai P. K. L., 2010, revision of Caridina yunnanensis and its allied species (Crustacea: Decapoda: Caridea: Atyidae) from Yunnan, southern China, with description of one new species, Journal of Natural History 35, pp. 213-227 : 219-221

Caridina dianchiensis Liang and Yan, 1985

(®gure 6) Caridina dianchiensis Liang and Yan, 1985: 196 , ®gures 1±10 (type locality: Panshui river, connected to Songhuaba reservoir near Kunming city, Yunnan) .

Material examined

PARATYPE: One m (ovigerous), cl. 6.8 mm, Panshui river, connected to Songhuaba reservoir near Kunming city, Yunnan, 9 May 1983 .

Other material. Two ll, cl. 4.5±5.3 mm, two mm, cl. 4.1±4.7 mm ( ZRC.1998.905), Bailongtan (White Dragon Pond), west of Dianchi Lake near Kunming city, Yunnan, leg. M. Kottelat et al., 24 November 1996 .

Diagnosis

Rostrum bent slightly downwards or sigmoid, reaching to or beyond end of antennular peduncle. Rostral formula 6±10 1 7±8/4±7 (mode 6), distal one-third to one-half of dorsal margin unarmed. Antennular peduncle 0.7±0.8 times as long as carapace. Carpus of ®rst pereiopod 1.6±2.0 times as long as high, chela 2.3±2.4 times as long as broad. Carpus of second pereiopod 5.0±5.3 times as long as high, chela 2.7±2.9 times as long as broad. Propodus of third pereiopod 3.5±3.7 times as long as dactylus, dactylus with six to seven spinules. Propodus of ®fth pereiopod 3.5±4.2 times as long as dactylus, dactylus with 34±37 spinules. Endopod of male ®rst pleopod sub-elliptical, with inner margin straight, reaching middle of exopod, 2.3±2.7 times as long as wide, appendix interna reaching to or slightly beyond distal end of endopod, appendix interna of male second pleopod short, less than 0.3 times as long as appendix masculina. Uropodal diaeresis with 10±12 teeth. Egg sizes 0.99± 1.16 Ö 0.66±0.77 mm in diameter.

Habitat

Found in rivers, streams and ponds ( Liang and Yan, 1985; M. Kottelat, personal communication).

Distribution Kunming, central Yunnan (®gure 1).

Remarks

The holotype for this species could not be located when the ®rst author visited SFU in February 1997. A paratype female, however, was examined. We also obtained additional specimens collected from near the type locality which agree well with the main diagnostic features of this species. The rostrum of C. dianchiensis , however, is more variable than was reported by Liang and Yan (1985) who stated that it was bent downwards in the male but turned upwards in the female. In our present series, male and female specimens with both kinds of rostrum were examined.