Caridina gracilirostris De Man, 1892

Cai, Yixiong, Ng, Peter K. L. & Choy, Satish, 2007, Freshwater Shrimps Of The Family Atyidae (Crustacea: Decapoda: Caridea) From Peninsular Malaysia And Singapore, Raffles Bulletin of Zoology 55 (2), pp. 277-309 : 284-285

Caridina gracilirostris De Man, 1892

Caridina gracilirostris De Man, 1892: 399 (part), Pl. 25, Fig.31a–c [type locality: river near Maros, Sulawesi (Celebes), Indonesia]; Kemp, 1918: 282; Johnson, 1961a: 124, Figs. 1 , 2 ; 1965: 8; Richard & Chandran, 1994: 242; Chace, 1997:10 (part); Jalihal & Shenoy, 1998: 128; Cai & Ng, 2001: 674, Fig.7 ; 2007 (in press); Wowor et al., 2004: 341, Fig. 5Q ; Shokita, 2003: 249, Fig. 18A; Cai & Shokita, 2006a: 250.

Caridina gracilirostris gracilirostris: Johnson, 1963: 20 .

Material examined. – Peninsular Malaysia:1 ovigerous female, cl 5.5 mm, ZRC 2007.0368 , slow, small, tidal stream, draining into Sungai Skudai at mile 7 Johor Bahru, Skudai Road , Malaysia, coll. D. S. Johnson, 10 May 1960 ; Singapore: 7 females, cl 3.5–3.9 mm, ZRC 2007.0369 , S. Simpungkii at Sembawang Road, Singapore, coll. 11 Jul.1961 ; 2 ovigerous females, cl 5.0– 5.1 mm, ZRC 1979.4.12.146–147, Sungei Seletar at Nee Soon, Singapore, 25 Sep.1959 ; 2 males, 4.0– 4.3 mm, 6 ovigerous females, cl 5.2–5.5 mm, ZRC 2007.0370 , Sungei Seletar , station 3, Singapore, coll. P. Yeo Kwai Ho, 23 Sep.1959 .

Remarks. – All the specimens examined in the present study have no appendix interna on the endopod of male first pleopod and thus should be referred to the typical form of Caridina gracilirostris . Cai & Ng (2007) recently revised the C. gracilirostris species group, referring the form with no appendix interna on the endopod of the male first pleopod to C. gracilirostris and the other form, with a distinct appendix interna on the endopod of male first pleopod to either C. appendiculata Jalihal & Shenoy, 1998 , or a new species.

Distribution.– Indonesia, Singapore, Malaysia, Thailand, Cambodia, Taiwan, Japan, Palau, the Philippines, Fiji, India and Madagascar (Cai & Ng, 2007)

Figures

Fig. 1. Map of Peninsular Malaysia and Singapore.

Fig. 2. Caridina peninsularis: A–E, cephalothorax and cephalic appendages; F, distal portion of telson; G, endopod of male first pleopod; H, appendix masculina and appendix interna of male second pleopod. Scale bars: A–F = 1 mm; G–H = 0.1 mm. (A, female, cl 4.6 mm; B, F, female, cl 5.0 mm; C, female, cl 4.3 mm; D, female, cl 3.6 mm; E, female, cl 4.0 mm; G, H, male, cl 2.9 mm; all material from Penang, Peninsular Malaysia, ZRC).

Fig. 7. Caridina sumatrensis: A, cephalothorax and cephalic appendages; B, distal portion of telson; C, first pereiopod; D, second pereiopod; E, third pereiopod; F, dactylus of third pereiopod; G, fifth pereiopod; H, dactylus of fifth pereiopod; I, male first pleopod; J, male second pleopod. Scale bars: A = 1 mm; C–E, G = 0.5 mm; B, F, H, I, J = 0.2 mm. (male, cl 3.7 mm, Sungai Telor, Peninsular Malaysia, ZRC).

Fig. 5. Caridina propinqua: A, cephalothorax and cephalic appendages; B, pre-anal carina; C, scaphocerite; D, first pereiopod; E, second pereiopod; F, third pereiopod; G, dactylus of third pereiopod; H, fifth pereiopod; I, dactylus of fifth pereiopod; J, diaeresis. Scale bars: A, C = 1 mm; B, D–F, H = 0.5 mm; G, I, J = 0.2 mm. (female, cl. 3.7 mm, Sungei Mandai, Singapore, ZRC).