Caridina spinata 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 : 25

Caridina spinata Woltereck, 1937

( Figure 6 )

Caridina spinata Woltereck, 1937a: 221 , figs.I, 3; PLS. 3,6 [type locality: Danau Towuti and Danau Matana, Sulawesi (Celebes), Indonesia].

Caridina spinata - Woltereck, 1937b:302, fig.8; Chace, 1997:20.

Material examined. Neotypes: 1 ovigerous female, cl 4.3 mm, ZRC, Lake Towuti, estuary of Sungei Batuopa, about 2 km south of Timampu, Sulawesi, Indonesia, coll. M. Kottelat & A. Werner, 14 Mar 1989. Others: 2 females, cl 3.5–3.8 mm, 3 ovigerous females, ZRC, Lake Towuti, Watidi, 4 km east of Timampu, Sulawesi, Indonesia, coll. M. Kottelat & A. Werner, 15 Mar 1989; 2 females, cl 2.8–4.0 mm, ZRC, Lake Towuti, estuary of Sungei Batuopa, about 2 km south of Timampu, Sulawesi, Indonesia, coll. M. Kottelat & A. Werner, 14 Mar 1989;

Description. Rostrum reaching slightly beyond end of scaphocerite, anterior half upturned; rostral formula: 3-4+14-20/5-10, dorsal teeth on anterior half widely placed except 1–2 subepical teeth. Antennal spine placed below inferior orbital angle. Pterygostomian angle sub-rectangular.

Sixth abdominal somite 0.65 times length of carapace, 1.8 times as long as fifth somite, as long as telson. Telson 3.6 times as long as wide, not terminating in a projection, with 3 pairs of dorsal spinules and one pair of dorsolateral spinules; distal end with about 4–5 pairs of spines, lateral pair distinctly longer than intermediate pairs, median pair shortest. Preanal carina with a spine.

Eyes well developed, anterior end reaching to 0.7 times length of basal segment of antennular peduncle. Antennular peduncle 0.9 times as long as carapace; basal segment of antennular peduncle longer than sum of second and third segment lengths, anterolateral angle reaching to 0.25 times length of the second segment, second segment twice as long as third segment. Stylocerite reaching 0.8 times length of basal segment of antennular peduncle. Scaphocerite slender, 4.4 times as long as wide.

Epipod absent from all pereiopods. First pereiopod with merus 3.9 times as long as broad, slightly shorter than carpus; carpus slightly excavated anteriorly, shorter than chela, 4.3 times as long as high; chela 3.5 times as long as broad; fingers 1.4 times as long as palm. Second pereiopod with merus distinctly shorter than carpus, 6.4 times as long as broad; carpus 1.4 times as long as chela, 8.5 times as long as high; chela 5.6 times as long as broad; fingers 1.3 times as long as palm. Third pereiopod with propodus 14 times as long as broad, 3.2 times as long as dactylus; dactylus 6.3 times as long as wide (spines included), terminating in 1 claw, with 8 accessory spines on flexor margin. Fifth pereiopod reaching to middle of second segment of antennular peduncle, propodus 16 times as long as broad, 2.6 times as long as dactylus, dactylus 5.5 times as long as wide (spinules included), terminating in 1 claw, with 30–51 spinules on flexor margin.

Uropodal diaeresis with 12 movable spinules.

Eggs 0.60x 0.45 mm in diameter.

Habitat. Lakes.

Remarks. With regards to the form of the rostrum, C. spinata shows superficially similarity to C. lanceolata . It however, can easily be separated from C. lanceolata by the shorter sixth somite segment which is 0.65 times as long as carapace (vs. 0.9–1.0 times in C. lanceolata ); the shorter antennular peduncle which is shorter than the carapace (vs. longer in C. lanceolata ); the more slender carpus on the second pereiopod (8.5 times as long as high vs. 6.6 times in C. lanceolata ); the longer and more slender dactylus on the third and fifth pereiopods (propodus 3.7 times as long as dactylus in thrid pereiopod and 2.6 times in fifth pereiopod vs. 4.8 times in third pereiopod and 4.2 times in fifth pereiopod in C. lanceolata ) and the absence of an epipod on all pereiopods (vs. present on first two pereiopods.).

Distribution. C. spinata is so far only found from Lake Towuti, Central Sulawesi, Indonesia.

Figures

FIGURE 6. Caridina spinata, A. cephalothorax and cephalic appendages, lateral view, B. distal portion of telson, C. preanal carina, D. telson, E. scaphocerite, F. first pereiopod, G. second pereiopod, H. third pereiopod, I. Fifth pereiopod, J. dactylus of third pereiopod, K. dactylus of fifth pereiopod, L. diaeresis. Scales: A, D, E = 1 mm; B, L = 0.2 mm; C, F, G, I, H = 0.5 mm; J, K = 0.1 mm. (ovigerous female, cl 4.3 mm, egg sized 0.6 x 0.45 mm, ZRC, Lake Towuti at estuary of Sungei Batuopa, Sulawesi)