Caridina sulawesi, Cai & Ng, 2009

Cai, Y. & Ng, P. K. L., 2009, The freshwater shrimps of the genera Caridina and Parisia from karst caves of Sulawesi Selatan, Indonesia, with descriptions of three new species (Crustacea: Decapoda: Caridea: Atyidae), Journal of Natural History 43 (17 - 18), pp. 1093-1114 : 1103-1108

Caridina sulawesi sp. nov.

( Figures 6–8 )

Material examined

Holotype: female, cl 4.6 mm, MZB, Sungai Beru, Kappang, Maros, Sulawesi Selatan, coll. P. Leclerc, 12 August 1990 . Paratypes: 7 males, cl 2.4–3.8 mm, 4 females, cl 2.9–4.8 mm, 1 juvenile, ZRC, same data as holotype ; 1 male, cl 2.8 mm, 1 female, cl 3.2 mm, ZRC, Sungai Balambang, about 500 m above Balambang, road from Malili to Soroako, Sulawesi, M. Kottelat, 19 June 1989 ; 2 males, cl 3.7–3.8 mm, 2 females, cl 3.9–4.6 mm, 1 ovigerous females, cl 3.9 mm, eggs 1.0 × 0.7 mm, 1 ovigerous female, cl 4.3 mm, ZRC, southern Sulawesi, coll. M. Kottelat, 1995 ; 121 males, cl 2.4–3.4 mm, 41 females, cl 2.4–4.1 mm, 4 ovigerous females, cl 3.1–3.6 mm, eggs 0.90–0.92 × 0.60–0.65 mm, 25 juveniles, ZMB Apr 02-01, Grote (cave) de la piscine, Maros , Sulawesi, coll. Y. Suhardjono and C. Rahmadi, 27 April 2002 ; 20 males, cl 2.2–3.2 mm, 3 females, cl 2.3–3.1 mm, 4 juveniles, ZMB Apr 02-02, Grote (cave) de la piscine, Maros , Sulawesi, coll. Y. Suhardjono and C. Rahmadi, 27 April 2002 ; 9 males, cl 2.7–3.2 mm, 1 female, cl 3.7 mm, 1 ovigerous female, cl 3.4 mm, eggs 0.97 × 0.63 mm, 1 juvenile, ZMB Apr 02-03, Grote (cave) de la piscine, Maros , Sulawesi, coll. Y. Suhardjono and C. Rahmadi, 27 April 2002 ; 21 males, cl 2.0– 3.0 mm, 10 females, cl 1.8–3.2 mm, 1 ovigerous female, cl 3.3 mm, eggs 1.0 × 0.60 mm, ZMB Apr 02-04, Grote (cave) de la piscine, Maros , Sulawesi, coll. Y. Suhardjono and C. Rahmadi, 27 April 2002 ; 34 males, cl 2.5–3.5 mm, 16 females, cl 2.5–4.0 mm, 4 ovigerous females, cl 3.4–3.7 mm, eggs 0.90–0.96 × 0.55–0.60 mm, ZRC, River flowing out from the entrance of the Gua Batunung , Maros, Sulawesi, coll. Y. Cai, 29 December 2004 .

Description

Rostrum straight, short and sharp, mostly unarmed, rarely armed with 023+126/ 023 very small teeth, reaching near to end of basal segment of antennular peduncle. Antennal spine fused with inferior orbital angle; pterygostomian margin rounded.

Sixth abdominal somite 0.4 times length of carapace, 2.0 times as long as fifth somite, shorter than telson. Telson 2.5 times as long as wide, not terminating in a projection, with four pairs of dorsal spinules and one pair of dorsolateral spinules; distal end with five pairs of spines, lateral pair distinctly longer than intermediate pairs. Preanal carina high, without spine.

Eyes well developed, anterior end reaching to 0.7 times length of basal segment of antennular peduncle. Antennular peduncle 0.4 times as long as carapace; basal segment of antennular peduncle longer than second and third segment lengths, anterolateral angle reaching 0.3 times length of second segment, second segment distinctly longer than third segment. Stylocerite reaching 0.7 times length of basal segment of antennular peduncle. Scaphocerite 3.0 times as long as wide.

Incisor process of mandible ending in irregular teeth, molar process truncated. Lower lacinia of maxillula broadly rounded, upper lacinia elongated, with a number of distinct teeth on inner margin, palp slender. Upper endites of maxilla subdivided, palp short, scaphognathite tapering posteriorly, with numerous long, curved setae at posterior end. Palp of first maxilliped ending in a triangular projection. Podobranch of second maxilliped incompletely reduced. Third maxilliped reaching to end of antennular peduncle, with ultimate segment as long as penultimate segment.

Epipod present on first two pereiopods, lacking on last three pereiopods. First pereiopod reaching beyond end of basal segment of antennular peduncle; merus 1.7 times as long as broad, shorter than carpus; carpus excavated anteriorly, shorter than chela, 1.7 times as long as high; chela 2.2 times as long as broad; fingers slightly shorter than palm. Second pereiopod reaching to end of antennular peduncle; merus distinctly shorter than carpus, 3.4 times as long as broad; carpus 1.4 times as long as chela, 5.7 times as long as high; chela 3.0 times as long as broad; fingers 1.3 times as long as palm. Third pereiopod reaching beyond end of scaphocerite by its dactylus, propodus 11 times as long as broad, 4.6 times as long as dactylus; dactylus 2.8 times as long as wide (spines included), terminating in one claw, with five accessory spines on flexor margin. Fifth pereiopod reaching to end of second segment of antennular peduncle, propodus 12 times as long as broad, 3.2 times as long as dactylus, dactylus 3.2 times as long as wide (spinules included), terminating in one claw, with 53–55 spinules on flexor margin.

Endopod of male first pleopod subrectangular, no appendix interna, 3.1 times as long as wide, 0.7 times length of exopod. Appendix masculina of male second pleopod 0.9 times length of endopod, with appendix interna 0.25 times length of appendix masculina.

Uropodal diaeresis with 16–21 movable spinules.

Habitat

Rivers.

Etymology

The species is named after the type locality, Sulawesi Selatan. The species name is used in apposition .

Remarks

With regards to the rostrum, C. sulawesi sp. nov., is most similar to C. typus H. Milne Ewards, 1837 (cf. Cai et al. 2006). It can, however, easily be differentiated by the absence of ventral teeth on the rostrum, the absence of an epipod on the last three legs, and the absence of an appendix interna on the endopod of the male first pleopod.

Distribution

Caridina sulawesi has been found in several locations in Maros, Sulawesi Selatan, in both surface water and subterranean habitats.

Figures

Figure 6. Caridina sulawesi new species. (A) Cephalothorax and cephalic appendages, (B) telson, (C) distal portion of telson, (D) scaphocerite, (E) first maxilliped, (F) second maxilliped, (G) third maxilliped, (H) preanal carina, (I) diaeresis. Scale bars: A, 1mm; B, D–H, 0.5mm; C, I, 0.2 mm. (Holotype, female, cl 4.6 mm, ZMB, Beru, Kappang, Maros, Sulawesi.)

Figure 7. Caridina sulawesi new species. (A) First pereiopod, (B) Second pereiopod, (C) third pereiopod, (D) dactylus of third pereiopod, (E) fifth pereiopod, (F) dactylus of fifth pereiopod, (G) male first pleopod, (H) male second pleopod. Scale bars: A–C, E, 0.5 mm; D, F, 0.1 mm; G, H, 0.2 mm. (A–F, female, cl 4.6 mm, holotype, ZMB; G, H, male, cl 3.4 mm, paratype, ZRC, Filtrage, Beru, Kappang, Maros, Sulawesi.)

Figure 8. Caridina sulawesi sp. nov. (A, B) Cephalothorax and cephalic appendages, (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) male first pleopod, (K) male second pereiopod. Scale bars: A–C, 1 mm; D–F, H, 0.5 mm; G, I–K, 0.2 mm. (A–I, ovigerous female, cl 4.2 mm, J, K, cl 3.9 mm, Sulawesi, MK95-3, ZRC.)