Caridina bruneiana Choy, 1992

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

Caridina bruneiana Choy, 1992

Caridina bruneiana Choy, 1992: 49 , Figs.1–4 [type locality: Brunei]; Wowor et al., 2004:343, Fig. 7A–C .

Material examined. – Singapore: 2 males, cl 3.0– 3.1 mm , 1 female, cl 3.5 mm, 17 ovigerous females, cl 4.8–6.1 mm, RMNH D 16621, Jurong, Singapore, coll. E. R. Alfred , 22 Mar.1958 ; 3 males, cl 3.0– 3.5 mm, 3 females, cl 2.3–3.2 mm, ZRC 1979.4.18.13–18, Sungai Peng Siang , 12 miles from Chua Chu Kang Road, Singapore, 18 Aug.1961 .

Habitat. – Similar to C. peninsularis , i.e. in streams or rivers with seawater influence.

Remarks. – With regard to the form of the rostrum, Caridina bruneiana is very similar to C. peninsularis , with which it has been found to occur together. However, it can be separated from C. peninsularis by the relatively higher rostrum, higher number of postorbital rostral teeth (2–3 vs. 3–5) and spinules on the dactylus of fifth pereiopod (19–22 vs. 38–42); and the absence of a spine on the preanal carina. Its presence in Singapore suggests a wider distribution in the Peninsular Malaysia, although it is not formally known there at present.

Distribution. – Borneo, Singapore (Choy, 1992; present study).

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. 3. Caridina peninsularis: A, antennular peduncle; B, scaphocerite; C, first pereiopod; D, second pereiopod; E, third pereiopod; F, dactylus of third pereiopod; G, fifth pereiopod; H, dactylus of fifth pereiopod; I, third maxilliped; J, preanal carina; K, diaeresis. Scale bars: A, B = 1 mm; C–E, G, I = 0.5 mm; F, H = 0.1 mm; K = 0.2 mm. (female, cl 5.0 mm, Penang, Peninsular Malaysia, ZRC).

Fig. 4. Caridina propinqua:A, B, cephalothorax and cephalic appendages; C, distal portion of telson; D, pre-anal carina; E, scaphocerite; F, first pereiopod; G, second pereiopod; H, third pereiopod; I, dactylus of third pereiopod; J, fifth pereiopod; K, dactylus of fifth pereiopod; L, diaeresis Scale bars: A, B, E = 1 mm; C, I, K, L = 0.2 mm; D, F–H, J = 0.5 mm. (A, female, cl 4.2 mm; B–K, female, cl 4.1 mm; all material from Sungei Buloh, Singapore, 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).