Caridina gracilirostris De Man, 1892

Cai, Yixiong, Choy, Satish & Ng, Peter K. L., 2009, Epigean And Hypogean Freshwater Shrimps Of Bohol Island, Central Philippines (Crustacea: Decapoda: Caridea), Raffles Bulletin of Zoology 57 (1), pp. 65-89 : 68

Caridina gracilirostris De Man, 1892

Caridina gracilirostris De Man, 1892: 399 , Pl. 25 Fig. 31–31d [type locality: Balangnipa, Sulawesi (Celebes) Indonesia]; Bouvier, 1925: 142, Figs. 305–307; Holthuis, 1965: 23, Fig. 7 ; Tiwari & Pillai, 1971: 83, Fig. 2a, b ; Chace, 1997: 10, Fig. 4 ; Wowor et al., 2004, Fig. 5Q ; Cai & Shokita, 2006a: 250; Cai & Shokita, 2006b: 2135; Cai & Ng, 2007: 1586.

Material examined. – Two males, cl 2.5–2.6 mm, 3 females, cl 2.0– 3.3 mm, 1 ovigerous female, cl 3.7 mm, ZRC 2007.0282 , tributary of Loboc River , Loboc, coll. Y. Cai, 19 Dec.2000 .

Remarks. – Cai & Ng (2007) recently reviewed the taxonomy of the Caridina gracilirostris species group in detail, referring the form with no appendix interna in endopod of male first pleopod as C. gracilirostris sensu stricto and the other, with a distinct appendix interna in the endopod of male first pleopod, as C. appendiculata Jalihal & Shenoy, 1998 . The specimens from Bohol have no appendix interna on the endopod of the male first pleopod, and are here referred to C. gracilirostris . It is an insular or coastal freshwater species commonly distributed in Indo-West Pacific region.

Figures

Fig. 7. Caridina boholensis, new species: A, cephalothorax and cephalic appendages, lateral view; B, telson; C, distal portion of telson; D, scaphocerite; E, mandible; F, maxillula; G, maxilla; H, first maxilliped; I, second maxilliped; J, third maxilliped; K, first pereiopod; L, second pereiopod. Scale bars: A, B, D = 1 mm, E–L = 0.5 mm, C = 0.1 mm (male, cl 3.7 mm, paratype, ZRC, Cave Bongkawi, Antequrra).

Fig. 2. Caridina lobocensis, new species: A, cephalothorax and cephalic appendages, lateral view; B, scaphocerite; C, mandible; D, maxillula; E, maxilla; F, first maxilliped; G, second maxilliped; H, third maxilliped. Scale bars: A = 2 mm, B–H = 1 mm (female, cl 6.9 mm, Paratype, ZRC, Philippines).

Fig. 4. Caridina lobocensis, new species: A, telson; B, endopod of male first pleopod; C, appendix masculina and appendix interna of male second pleopod; D, first pereiopod; E, second pereiopod; F, third pereiopod; G, dactylus of third pereiopod; H, fifth pereiopod; I, dactylus of fifth pereiopod. Scale bars: A, D–F, H = 1 mm; B, C, G, I = 0.2 mm (A–C, male, cl 5.7 mm, paratype, ZRC, Bohol Island, Philippines; D–I, female, cl 6.9 mm, paratype, ZRC, Bohol Island, Philippines).

Fig. 5. Caridina liaoi, new species. A: cephalothorax and cephalic appendages, lateral view; B, first pereiopod; C, second pereiopod; D, third pereiopod; E, dactylus of third pereiopod; F, fifth pereiopod; G, dactylus of fifth pereiopod; H, endopod of male first pleopod; I, appendix masculina and appendix interna of male second pleopod. Scale bars: A–D, F = 1 mm; E, G = 0.1 mm; H, I = 0.2 mm (male, cl 4.0 mm, paratype, ZRC, Bilar river).