Caridina parvidentata J. Roux, 1904

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 : 1099-1103

Caridina parvidentata J. Roux, 1904

( Figures 3–5 )

Caridina pareparensis parvidentata J. Roux, 1904, p. 553 [type locality: Malawa , Celebes (Sulawesi), Indonesia].

Material examined

Lectotype: ovigerous female, cl 4.0 mm, eggs 1.00 × 0.65 mm, Malawa Quelle , Celebes (5 Sulawesi), BNHM 8 Ia, coll. G. D. Sarasin. Paralectotype: 1 male, cl 2.5 mm, 3 females, cl 2.8–3.7 mm, 1 ovigerous females, cl 4.0 mm, eggs 1.00– 0.65 mm, Malawa Quelle , Celebes (5 Sulawesi), BNHM 8 Ia, coll. G. D. Sarasin. Others : 6 males, cl 2.5–3.1 mm, 19 females, cl 3.0–4.0 mm, 7 ovigerous females, cl 3.5–4.7 mm, eggs 0.9 × 0.6 mm, RMNH, Makale, Sulawesi Selatan, 24 January 1948 ; 1 male, cl 3.1 mm, 4 females, cl 2.4–3.4 mm, Palanro , Sulawesi Selatan, 24 January 1948 ; 1 female, cl 2.7 mm, ZRC SULA-054 , Gua (cave) Cumpareng Hae near Malawa , Northeast of Makassar , Sulawesi Selatan, 4 ° 509 S, 119 ° 529 E, coll. L. Deharveng, 12 July 1988 ; 1 male, cl 3.2 mm, 1 female, cl 2.3 mm, Gua Londron, Tonasa, Pangkajene , Sulawesi Selatan, coll. P. Leclerc, 28 July 1989 . 1 male, cl 3.9 mm, ZRC, Gua Tanette, Kappang, Maros , Sulawesi Selatan, coll. P. Leclere, 15 August 1990 ; 5 females, cl 3.1–3.8 mm, ZMB Ag-01-03, Gua Salomatie, Batuputih, Maros , Sulawesi, coll. C. Rahmadi et al., 14 August 2001 ; 1 female, cl 3.6 mm, ZMB Crus 036, Gua Samanggi, Maros , Sulawesi, coll. Brehier et al., 31 July 2001 .

Description

Rostrum reaching near to or slightly beyond end of basal segment of antennular peduncle, dorsal margin nearly horizontal, or slightly sigmoid, rostral formula: 021+4212/024, Antennal spine fused with inferior orbital angle; pterygostomian margin subrectangular.

Sixth abdominal somite 0.40–0.45 times length of carapace, 1.6 times as long as fifth somite, as long as telson. Telson 3.0 times as long as wide, not terminating in a projection, with three or four pairs of dorsal spinules and one pair of dorsolateral spinules; distal end with three pairs of spines, lateral pair slightly longer than intermediate pairs. Preanal carina low, without spine.

Eyes well developed, or moderately developed, anterior end reaching to 0.7 times length of basal segment of antennular peduncle. Antennular peduncle 0.63 times as long as carapace; basal segment of antennular peduncle longer than second and third segment lengths, anterolateral angle reaching 0.20 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 3.8 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 reduced to a lamina. Third maxilliped reaching to end of second segment of antennular peduncle, with ultimate segment as long as penultimate segment.

Epipods present on first three pereiopods. First pereiopod reaching to distal end of basal segment of antennular peduncle; merus 2.0 times as long as broad, shorter than carpus; carpus excavated anteriorly, shorter than chela, 1.8 times as long as high; chela 2.3 times as long as broad; fingers slightly longer than palm. Second pereiopod reaching to end of basal segment of antennular peduncle; merus distinctly shorter than carpus, 4.1 times as long as broad; carpus 1.3 times as long as chela, 6.0 times as long as high; chela 3.8 times as long as broad; fingers 1.3 times as long as palm. Third pereiopod reaching beyond end of scaphocerite by entire dactylus, propodus 11 times as long as broad, 4.2 times as long as dactylus; dactylus 3.1 times as long as wide (spines included), terminating in one claw, with five or six accessory spines on flexor margin. Fifth pereiopod reaching to end of scaphocerite, propodus 14 times as long as broad, 2.9 times as long as dactylus, dactylus 4.1 times as long as wide (spinules included), terminating in one claw, with 61 spinules on flexor margin.

Endopod of male first pleopod subrectangular, no appendix interna, 2.9 times as long as wide, 0.4 times length of exopod. Appendix masculina of male second pleopod very slender, 0.8 times length of endopod, with appendix interna 0.3 times length of appendix masculina.

Uropodal diaeresis with 14–21 movable spinules.

Eggs 0.90 × 0.60 mm in diameter.

Habitat

Rivers, cave streams.

Remarks

Caridina parvidentata J. Roux, 1904 , differs from C. pareparensis De Man, 1892 (fig. 1) by the rostral formula (021+4212/024 versus 324+9219/023), the stouter merus of the first pereiopod (2.0 times as long as wide versus 2.5 times in C. pareparensis ), the more slender carpus of the first pereiopod (1.8 times as long as high versus 1.4 times in C. pareparensis ), the more slender merus of the second pereiopod (4.1 times as long wide versus 1.4 times in C. pareparensis ), the more slender carpus of the second pereiopod (6.0 times as long as wide versus 4.3 times in C. pareparensis ), and the relatively longer dactylus of the fifth pereiopod (propodus 2.9 times as long as dactylus versus 3.3 times in C. pareparensis ). Caridina parvidentata was originally described as a subspecies of C. pareparensis but as the above-mentioned differences are so substantial, it is here treated as a full species.

Distribution

Caridina parvidentata has been found from several locations in southern Sulawesi, mostly from cave systems.

Figures

Figure 3. Caridina parvidentata. (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) preanal carina, (L) diaeresis. Scale bars: A, D, 1 mm; B, E–K, 0.5 mm; C, L, 0.2 mm. (Male, cl 4.2 mm, egg size 0.95×0.62 mm, RMNH, Makale, South Sulawesi.)

Figure 4. Caridina parvidentata. (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; F, D, 0.1 mm; G, H, 0.2 mm. (Male, cl 4.2 mm, egg sized 0.95×0.62 mm, RMNH, Makale, South Sulawesi.)

Figure 5. Caridina parvidentata. (A) Cephalothorax and cephalic appendages, (B) telson, (C) distal portion of telson, (D) first pereiopod, (E) second pereiopod, (F) endopod of male first pleopod, (G) appendix masculina and appendix interna of male second pleopod, (H) diaeresis. Scale bars: A, 1 mm; B, D, E, 0.5 mm; C, F–H, 0.2 mm. (One male, cl 3.9 mm, ZRC, Gua Tanette, Kappang, Maros, Sulawesi Selatan, Indonesia.)