Caridina woltereckae, Cai, Yixiong, Wowor, Daisy & Choy, Satish, 2009

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 : 19-21

Caridina woltereckae , new species

( Figure 3 )

Material examined. Holotype: male, cl 2.4 mm, MZB Cru 2263, Cape Larona, near Sungai Larona outlet, Lake Towuti, Sulawesi, Indonesia, rocky coast with white sand substrate, caught by diving, coll. C. Schubart et al., 25 Jan 2000. Paratypes: 3 males, cl 2.1–2.4 mm, 1 female, cl 3.1 mm, 4 ovigerous females, cl 2.8–3.1 mm, eggs 0.90x 0.58 mm, ZRC, data same as holotype. Others: 1 female, cl 2.8 mm, ZRC, Tanjung Bakara, south of Desa Timampu, Lake Towuti, Sulawesi, big rocky coast, caught by diving, coll. C. Schubart et al., 25 Jan 2000; 5 males, cl 2.1–2.4 mm, 5 females, cl 2.3–2.4 mm, 5 ovigerous females, cl 2.3–3.1 mm, eggs 0.9x 0.55 mm, 8 juveniles, ZRC, Lake Mahalona , Sulawesi, rocky bottom, caught by diving, Sulawesi, Indonesia, coll C. Schubart et al., 27 Jan 2000; 2 males, cl 2.7–3.3 mm, 6 females, cl 2.1–2.7 mm, 5 ovigerous females, cl 2.5–3.6 mm, egg 0.9x 0.5 mm, MZB Cru 2264, Lake Mahalona , second station, Sulawesi, coll. C. Schubart et al., 27 Jan 2000.

Description. Rostrum slender, reaching slightly beyond end of scaphocerite, slightly longer than carapace to twice as long as carapace, anterior half slightly upturned; rostral formula: 3-4+13-19/9-18, anterior teeth widely placed than posterior ones. Antennal spine placed below inferior orbital angle. Pterygostomian angle broadly rounded.

Sixth abdominal somite 0.54 times of carapace, 1.8 times as long as fifth somite, distinctly shorter than telson. Telson 3.4 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 rounded, without spine.

Eyes well developed, anterior end reaching to 0.8 times length of basal segment of antennular peduncle. Antennular peduncle as long as carapace; basal segment of antennular peduncle slightly longer than sum of second and third segment lengths, anterolateral angle reaching to 0.3 times length of the second segment, second segment twice as long as third segment. Stylocerite reaching 0.9 times length of basal segment of antennular peduncle. Scaphocerite slender, 5.0 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 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 small lamina. Third maxilliped reaching to end of antennular peduncle, with ultimate segment slightly shorter than penultimate segment.

Epipods present on first pereiopod, lacking from last four pereiopods. First pereiopod reaching to distal end of eye stalk; merus 2.9 times as long as broad, shorter than carpus; carpus shorter than chela, 2.3 times as long as high; chela 2.0 times as long as broad, fingers 1.3 times longer than palm. Second pereiopod reaching to middle of second segment of antennular peduncle; merus distinctly shorter than carpus, 4.0 times as long as broad; carpus 1.2 times as long as chela, 4.7 times as long as high; chela 2.4 times as long as broad; fingers 1.2 times as long as palm. Third pereiopod reaching to end of antennular peduncle, propodus 14 times as long as broad, 5.6 times as long as dactylus; dactylus 3.5–4.2 times as long as wide (spines included), terminating in 1 claw, with 1–2 accessory spines on flexor margin. Fifth pereiopod reaching to middle of second segment of antennular peduncle, propodus 16 times as long as broad, 3.4 times as long as dactylus, dactylus 4.4 times as long as wide (spinules included), terminating in 1 claw, with 29–31 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 distinctly reaching beyond end of appendix masculina.

Uropodal diaeresis with 7–13 movable spinules.

Eggs 0.90x 0.50–0.55 mm in diameter.

Color. Similar to C. spongicola which has been described by Zitzler & Cai (2006), but more prominent in color and better defined in colour pattern.

Habitat. Lakes. It is only found in rocky area, a solitary species on rocky substractum.

Etymology. The species is named after Eva Woltereck, who contributed much of our knowledge on the atyid shrimps of Sulawesi.

Remarks. With regard to the form of the rostrum, Caridina woltereckae resembles C. lanceolata , and C. spinata . It, however, can be separated form these species by the absence of a preanal carina. It differs from C. lanceolata by the much shorter sixth abdominal somite which is only 0.54 times as long as carapace (vs. 0.90–1.0 times in C. lanceolata ). It can be differentiated from C. spinata by the much stouter carpus on the first two pereiopods (2.3 times as long as high in first pereiopod and 4.0 times as long as high in second pereiopod vs. 4.3 times and 8.5 times in C. spinata ). With regards to the color pattern and the proportions of various joints on pereipods, Caridina woltereckae is very similar to C. spongicola . It could be separated from C. spongicola by a longer rostrum (various from slightly longer than carapace to twice the length of carapace vs. 0.9 to 1.0 times length of carapace on C. spongicola ), which generally has more ventral teeth (9–18 vs. 4–10 in C. spongicola ), and a longer appendix interna in male second pleopod (distinctly reach beyond end of appendix masculina vs. does not reach the end of appendix masculina in C. spongicola )

Figures

FIGURE 3. Caridina woltereckae, 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. first pereiopod, L. second pereiopod, M. third pereiopod, N, O. dactylus of third pereiopod, P. fifth pereiopod, Q. dactylus of fifth pereiopod, R. endopod of male first pleopod, S. appendix masculina and appendix interna of male second pleopod, T. preanal carina, U. diaeresis. Scales: A = 1 mm; B, D – M, P, T = 0.5 mm; C, N, O, Q, R, S, U = 0.2 mm. (A – N, P, Q, T, U, paratype, ovigerous female, cl 2.8 mm, egg sized 0.9 x 0.5 mm, O, R, S, paratype, male, cl 2.6 mm, DW 2000 - 24)