Caridina lanceolata 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 : 15-19

Caridina lanceolata Woltereck, 1937

( Figures 1 , 2 )

Caridina lanceolata Woltereck, 1937a: 224 , figs. I, 7a–c; pls.3, 6 [type locality: lakes in central Sulawesi (Celebes), Indonesia]

Caridina lanceolata - Woltereck, 1937b: 307, fig. 11; Chace, 1997: 12.

Material examined. Neotype: male, cl 3.0 mm, ZRC, Lake Matano, Mengonuwai, Sulawesi, coll. M. Kottelat & A. Werner, 12 Mar 1989. Others: 4 females, 2.7–3.0 mm, 2 ovigerous females, cl 3.4–3.6 mm, ZRC, Lake Matano, at about 2 km SE of Matano, coll. M. Kottelat & A. Werner, 18 Mar 1989; 1 male, cl 2.1 mm, 1 ovigerous female, cl 3.3 mm, ZRC, Lake, Mahalona , second station, Sulawesi, coll. C. Schubart et al., 27 Jan 2000; 7 males, cl 1.9–3.0 mm, 8 females, cl 2.1–3.2 mm, 15 ovigerous females, cl 3.1–3.8 mm, ZRC, Lake Mahalona , opposite of south Mahalona outlet, Central Sulawesi, Indonesia, coll. C. Schubart et al., 27 Jan 2000; 25 males, cl 2.2–3.2 mm, 19 females, cl 2.4–3.1 mm, 22 ovigerous females, cl 3.2–4.2 mm, MZB Cru 2261, Nuha Langkai, an island in Lake Matano at west of Lengko Laro Bay, Sulawesi, Indonesia, coll. C. Schubart et al., 26 Jan 2000; 12 males, cl 2.0– 3.1 mm, 10 females, cl 1.9–2.8 mm, 8 ovigerous females, cl 2.6–3.7 mm, MZB Cru 2262, Timbala Bay, south of Cape Bakara, Lake Towuti, Sulawesi, Indonesia, coll. C. Schubart et al., 25 Jan 2000; 3 females, cl 3.0– 3.3 mm, 1 ovigerous female, cl 4.0 mm, ZRC, Lake Matano, Mengonuwai, Sulawesi, coll. M. Kottelat & A. Werner, 12 Mar 1989; 6 males, cl 2.2–3.2 mm, 1 female, cl 2.9 mm, 12 ovigerous females, cl 3.5–4.0 mm, ZRC, Lake Towuti, Telok Balaote, about 8 km south of Timampu, Sulawesi, coll. M. Kottelat & A. Werner, 14 Mar 1989; 1 male, cl 2.3 mm, 1 ovigerous female, cl 3.6 mm, ZRC, Lake Matano, south coast, west of Soroako, Sulawesi, coll. M. Kottelat, 18 Jun 1988; 1 ovigerous female, cl 3.2 mm, ZRC, Lake Mahalona , southwest coast, Sulawesi, coll. M. Kottelat & A. Werner, Mar 1989; 2 males, cl 2.2–2.6 mm, 4 females, cl 2.3–2.7 mm, ZRC, Lake Matano at southern coast, about 2 km southeast of Matano, Sulawesi, coll. M. Kottelat, 29 Jan 1991; 1 ovigerous female, cl. 3.6 mm, 1 male, cl 2.7 mm, 4 females, cl. 2.2–3.0mm, ZRC, Southern coast of Lake Matano, central Sulawesi, coll. M. Kottelat, 31 Jan 1991.

Description. Rostrum slender, reaching far beyond end of scaphocerite, more than 1.5 times as long as carapace, sigmoid, anterior 1/3 strongly upturned; rostral formula: 1-4+10-15+1-2/4-10, unarmed gape on dorsal margin 0.33–0.5 times length of carapace. Antennal spine placed below inferior orbital angle. Pterygostomian angle broadly rounded.

Sixth abdominal somite 0.9–1.0 times of carapace, 2.1 times as long as fifth somite, 1.2 times as long as telson. Telson 3.9 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 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 slightly longer than 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, 5.9 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 projection. Podobranch of second maxilliped reduced to a small lamina. Third maxilliped reaching beyond end of basal segment of antennular peduncle, with ultimate segment distinctly shorter than penultimate segment.

Epipods present on first two pereiopods. First pereiopod reaching to distal end of eye stalk; merus 3.5 times as long as broad, shorter than carpus; carpus slightly excavated anteriorly, longer than chela, 2.0–4.7 times as long as high; chela 2.9 times as long as broad; fingers 1.4 times longer than palm. Second pereiopod reaching beyond end of basal segment of antennular peduncle; merus distinctly shorter than carpus, 6.6 times as long as broad; carpus 1.9 times as long as chela, 11 times as long as high; chela 3.6 times as long as broad; fingers 1.7 times as long as palm. Third pereiopod reaching to end of antennular peduncle, propodus 18 times as long as broad, 4.8 times as long as dactylus; dactylus 4.2 times as long as wide (spines included), terminating in 1 claw, with 5 accessory spines on flexor margin. Fifth pereiopod reaching slightly beyond end of basal segment of antennular peduncle, propodus 20 times as long as broad, 4.2 times as long as dactylus, dactylus 5.2 times as long as wide (spinules included), terminating in 1 claw, with 40 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 about 0.33 times length of endopod, appendix interna reaching to end of appendix masculina.

Uropodal diaeresis with 6–9 movable spinules.

Eggs 0.70–0.75x 0.40–0.48 mm in diameter.

Color. transluction grey.

Habitat. Lakes. It is commonly found clinging to fallen branches, cobbles and boulders.

Remarks. With regard to the rostrum, Caridina lanceolata is similar to C. lingkonae (cf. Woltereck, 1937), but can be differentiated by its longer sixth somite segment which is 0.9 to 1.0 times as long as carapace (vs. 0.7 times in C. lingkonae ); the less elongated carpus of the second pereiopod (6.6 times as long as high vs. 8.0 times in C. lingkonae ), and the presence of epipods on the first two pereiopods (vs. on first pereiopod only in C. lingkonae ).

Specimens of Woltereck (1937a, b) are no longer extant (M. Tuerkay, O. Coleman, & K. von Rintelen, pers. com). As all new species described by Woltereck are morphologically close to each other and to stabilize the taxonomic status of those species, neotypes are designated if specimens are available from the recent collections. A neotype for C. lanceolata is designated here (1 male, cl 2.9 mm, ZRC, Lake Matano, south coast).

Distribution. Known only from Lake Towuti, Lake Mahalona and Lake Matano, Central Sulawesi, Indonesia.

Figures

FIGURE 1. Caridina lanceolata, A. cephalothorax and cephalic appendages, B. telson, C. distal portion of telson, D. scaphocerite, E. mandible, F. first maxilliped, G. second maxilliped, H. third maxilliped, I. preanal carina. Scales: A = 1 mm; B, D – I = 0.5 mm; C = 0.2 mm. (male, cl 3.0 mm, ZRC)

FIGURE 2. Caridina lanceolata, A. first pereiopod, B. second pereiopod, C. third pereiopod, D. fifth pereiopod, E. dactylus of third pereiopod, F. dactylus of fifth pereiopod, G. endopod of male first pleopod, H. appendix masculina and appendix interna of male second pleopod, I. uropodal diaeresis. Scales: A – D = 0.5 mm; E, F = 0.1 mm; G, H = 0.2 mm. (male, cl 3.0 mm, ZRC)