Caridina sumatrensis 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 : 289

Caridina sumatrensis De Man, 1892

( Fig. 7 )

Caridina weberi var. sumatrensis De Man, 1892: 375 , pl. 22, Fig. 23g [type locality: Deli , Sumatra, Indonesia].

Caridina weberi sumatrensis – Bouvier, 1925: 247, Fig. 567; Johnson, 1963: 26.

Caridina sumatrensis – Wowor et al., 2004: 343, Fig. 6P, Q ; Cai & Shokita, 2006a: 246.

Material examined. – Peninsular Malaysia: 1 male, cl 3.7 mm, ZRC, Sungai Telor , Malaysia, coll. Ng et al., 7 Sep.1998 ; 2 males, cl 3.1–3.3 mm, 6 ovigerous females, cl 4.2–5.3 mm, ZRC 2007.0379 , Sungai Mupor, Kota Tinggi, Malaysia, 21 Aug.1994 ; 1 male, cl 3.2 mm, 10 females, cl 2.8–3.1 mm, ZRC 2007.0380 , Maxwell Hill , Malaysia, coll. H. H. Tan, 1995; 2 ovigerous females, cl 5.4–6.7 mm, ZRC 2007.0381 , Sekayu Waterfall, Malaysia, coll. H. H. Tan, 17 Jun.1995 ; 1 male, cl 3.8 mm, 2 females, cl 4.8–5.0 mm, ZRC 2007.0382 , stream outside Kota Tinggi Waterfall, coll N. K. Ng et al., 20 Sep.1998 ; 3 females, cl 5.2–5.7 mm, ZRC 2007.0383 , Sungai Dohol , Malaysia, coll. H. H. Tan, 24 Feb.1995 ; 10 males, cl 3.2–3.4 mm, 2 females, cl 3.7–4.8 mm, ZRC 2007.0384 , Mersing , Malaysia, coll. H. H. Tan, 9 May 1995 ; 3 males, cl 2.7–4.0 mm, 8 females, cl 2.2–4.7 mm, ZRC 2007.0385 , Malaysia , stream outside Sekayu Waterfall, pH 5.3, coll. P. K. L. Ng, 18 Mar.1992 ; 5 males, cl 3.6–3.7 mm, 5 ovigerous females, cl 5.3–5.5 mm, ZRC 2007.0386 , Malaysia: Gunung Panti, Kota Tinggi, coll. P. K. L. Ng, 1991 . Singapore: 1 male, cl 2.3 mm , 4 females, cl 2.2–2.4 mm, ZRC 2007.0387 , Lombong Stream, Singapore, 31 Aug.1990 ; 2 females, cl 5.8–6.3 mm, RMNH D 16621, Jurong , Singapore, coll. E. R. Alfred, 22 Mar.1958 .

Habitat. – Rivers and streams.

Remarks. – With 4–6 postorbital teeth, C. sumatrensis is easily separated from other subspecies of C. weberi and is recognized as a distinct species. It was recently reported from the Philippines by Cai & Shokita (2006a).

Distribution. – Sumatra, Malay Peninsula and the Philippines (present study; Cai & Shokita, 2006a).

Figures

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. 6. Caridina propinqua: A, cephalothorax and cephalic appendages; B, scaphocerite; C, mandible; D, maxillula; E, maxilla; F, first maxilliped; G, second maxilliped; H, third maxilliped; I, first pereiopod; J, second pereiopod; K, third pereiopod; L, fifth pereiopod; M, endopod of male first pleopod; N, appendix masculina and appendix interna of male second pleopod. Scale bars: A, B = 1 mm; C–L = 0.5 mm; M, N = 0.2 mm. (male, cl 2.9 mm, Sungai Sedili, Johor, Peninsular Malaysia, ZRC).