Caridina loehae Woltereck, 1937

Cai, Yixiong, Wowor, Daisy & Choy, Satish, 2009, Partial revision of freshwater shrimps from Central Sulawesi, Indonesia, with descriptions of two new species (Crustacea: Decapoda: Atyidae), Zootaxa 2045, pp. 15-32 : 27-29

Caridina loehae Woltereck, 1937

( Figure 7 )

Caridina loehae Woltereck, 1937a: 222 , figs. I, 5a–d; pls.3,6 [type locality: Danau Matano and Danau Towuti, Sulawesi (Celebes), Indonesia]

Caridina loehae - Woltereck, 1937b: 304, fig.; Chace, 1997:13.

Material examined. Neotype: ovigerous female, cl 2.6 mm, ZRC, Lake Towuti, about 3 km south of Timampu, estuary of Sungei Batuopa, Sulawesi, Indonesia, coll. M. Kottelat, 22 Jun 1988. 1 ovigerous female, cl 3.1 mm, ZRC, Lake Matano, southern coast, about midway between Matano and Soroako, coll. M. Kottelat, 3 Jan 1991; 1 female, cl 3.8 mm, 1 ovigerous female, cl 4.1 mm, ZRC, Lake Towuti, about 3 km south of Timampu, Tandjung Posombuwang, coll. M. Kottelat, 29 Jun 1988; 2 males, cl 1.7–1.9 mm, 10 females, cl 2.2–2.6 mm, 9 ovigerous females, cl 2.4–2.6 mm, ZRC, Lake Towuti, about 3 km south of Timampu, estuary of Sungei Batuopa, Sulawesi, Indonesia, coll. M. Kottelat, 22 Jun 1988; 1 female, cl 3.3 mm, ZRC, Lake Matano at Mengonuwai, Sulawesi, Indonesia, coll. M. Kottelat & Werner, 19 Mar 1989.

Description. Rostrum slender, reaching to or slightly beyond end of antennular peduncle, posterior 2/3 sloping down while anterior end upturned slightly; rostral formula: 1-3+10-14/4-7, unarmed on anterior third of dorsal margin. Antennal spine placed slightly below inferior orbital angle. Pterygostomian angle broadly rounded.

Sixth abdominal somite 0.77 times of carapace, 1.8 times as long as fifth somite, as long as telson. Telson 3.4 times as long as wide, not terminating in a projection, with 3–4 pairs of dorsal spinules and one pair of dorsolateral spinules; distal end with about three pairs of spines, lateral pair distinctly longer than intermediates. Preanal carina low, without spine.

Eyes well developed, anterior end reaching to 0.8 times length of basal segment of antennular peduncle. Antennular peduncle 0.92–0.94 times as long as carapace; basal segment of antennular peduncle longer than sum of second and third segment lengths, anterolateral angle reaching 0.25 times length of the second segment, second segment distinctly longer than third segment. Stylocerite reaching 0.8 times length of basal segment of antennular peduncle. Scaphocerite 4.1 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 elongated, scaphognathite tapering posteriorly with numerous long, curved setae at posterior end. Palp of first maxilliped rounded, ending in a finger-like projection. Podobranch of second maxilliped reduced to a lamina. Third maxilliped reaching to end of antennular peduncle, with ultimate segment slightly longer than penultimate segment.

Epipods present on first 2 pereiopods. First pereiopod reaching to distal end of basal segment of antennular peduncle; merus 2.5 times as long as broad, shorter than carpus; carpus excavated anteriorly, shorter than chela, 2.1 times as long as high; chela 2.0 times as long as broad; fingers slightly longer than palm. Second pereiopod reaching to end of second segment of antennular peduncle; merus distinctly shorter than carpus, 4.6 times as long as broad; carpus 1.3 times as long as chela, 5.9 times as long as high; chela 2.7 times as long as broad; fingers slightly longer than palm. Third pereiopod reaching to end of scaphocerite, propodus 12 times as long as broad, 3.2 times as long as dactylus; dactylus 4.0 times as long as wide (spines included), terminating in 1 claw, with 8 accessory spines on flexor margin. Fifth pereiopod reaching beyond end of basal segment of antennular peduncle, propodus 13 times as long as broad, 2.7 times as long as dactylus, dactylus 4.3 times as long as wide (spinules included), terminating in 1 claw, with 36 spinules on flexor margin. Endopod of male first pleopod subtriangular, with no appendix interna, 0.2 times length of exopod. Appendix masculina of male second pleopod slender, about 0.4 times length of endopod.

Uropodal diaeresis with 6–10 movable spinules.

Eggs 0.90x 0.58 mm in diameter.

Habitat. Lakes.

Remarks. With regard to the form of the rostrum and the proportions of the various segments of the pereiopods, Caridina loehae closely resembles C. opaensis Roux, 1904 . However, it can be separated from C. opaensis by the longer antennular peduncle (0.92–0.94 times as long as carapace vs. 0.79–0.82 times in C. opaensis ), smaller number of spinules on the uropodal diaeresis (6–10 vs. 15–17 in C. opaensis ) and the lack of a preanal carina spine.

Distribution. Found only from Lake Towuti and Lake Matano in Central Sulawesi, Indonesia.

Figures

FIGURE 7. Caridina loehae, A. cephalothorax and cephalic appendages, B. cephalothorax and cephalic appendages, C. telson, D. distal portion of telson, E. scaphocerite, F. mandible, G. maxillula, H. maxilla, I. first maxilliped, J. second maxilliped, K. third maxilliped, L. first pereiopod, M. second pereiopod, N. third pereiopod, O. dactylus of third pereiopod, P. fifth pereiopod, Q. dactylus of fifth pereiopod, R. preanal carina, S. diaeresis. Scales: A – C, E, H = 1 mm; D, O, Q, S = 0.2 mm; F, G, I – N, P, R = 0.5 mm. (A, female, cl 2.6 mm, B – S, ovigerous female, cl 2.6 mm, egg sized 0.90 x 0.58 mm, ZRC, estuary of Sungei Batuopa, Lake Towuti, Sulawesi)