Caridina acutirostris Schenkel, 1902

Cai, Yixiong & Wowor, Daisy, 2007, Atyid Shrimps From Lake Poso, Central Sulawesi, Indonesia With Description Of A New Species (Crustacea: Decapoda: Caridea), Raffles Bulletin of Zoology 55 (2), pp. 311-320 : 314-315

Caridina acutirostris Schenkel, 1902

Caridina acutirostris Schenkel, 1902: 496 , Pl. 8: Figs. 3a–c , 4b [type locality: south of Danau Poso, Sulawesi (Celebes), Indonesia]; Bouvier, 1925: 166, Figs. 353–355; Chace, 1997: 6.

Material examined. – Holotype: female, cl 5.2 mm, NHMB 3 a, south of Lake Poso , central Sulawesi, Indonesia, coll. Sarasin, no date indicated.

Diagnosis. – Rostrum not reaching end of antennular peduncle, slightly upturned anteriorly, armed dorsally with 10 teeth in posterior 1/2, including 3 on carapace posterior to orbital margin, armed ventrally with 6 teeth. Antennal spine placed slightly below inferior orbital angle; pterygostomian margin rounded. Lateral pair of posterior telson spines longer than intermedian pairs. Stylocerite reaching near end of basal segment of antennular peduncle. Carpus of first pereiopod slightly excavated. Epipods well developed on first 4 pereiopods (after Chace, 1997).

Remarks. – No fresh material was available for the present study. Chace (1997) has provided a diagnosis based on the original description. Although the first author has examined the single type specimen, the poor condition of the specimen prevents us from re-describing the species in detail. With its complete, well developed epipods (well developed in first 4 vs. at most, developed only in first 2), C. acutirostris can easily be separated from other Cairidina species of Lake Poso, Sulawesi. Although several collection trips have been made to the Lake Poso, specimens of C. acutirostris have not been collected. As all these trips did not sample all the possible habitats along the lake as well as the rivers connected the lake thoroughly, it is too early for us to state any possible causes.

Distribution. – Known only from Lake Poso in central Sulawesi, Indonesia.

Figures

Fig. 3. Caridina sarasinorum: 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, endopod of male first pleopod; J, appendix masculina and appendix interna of male second pleopod; K, preanal carina; L, diaeresis. Scale bars: A = 1 mm; B, F, H, I, J, L = 0.2 mm; C–E, G, K = 0.5 mm. (lectotype, BNHM).

Fig. 4. Caridina longidigita, new species: A, cephalothorax and cephalic appendages; 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 preanal carina; L, diaeresis. Scale bars: A, D = 1 mm; B, E–K = 0.5 mm; C, L = 0.2 mm. (paratype, ZRC 2007.0748).