Caridina anislaq, Cai & Choy & Ng, 2009

Cai, Yixiong, Choy, Satish & Ng, Peter K. L., 2009, Epigean And Hypogean Freshwater Shrimps Of Bohol Island, Central Philippines (Crustacea: Decapoda: Caridea), Raffles Bulletin of Zoology 57 (1), pp. 65-89 : 82

Caridina anislaq , new species

( Fig. 11 )

Material examined. – Holotype: Male, cl 3.4 mm, USC. Spring Anislaq, outside Cave Valencia, Valencia, coll. B. Sket, Feb.1995.

Paratypes: 10 males, cl 2.2–3.4 mm, 9 females, cl 2.2–5.4 mm, ZRC 2007.0301 , data same as holotype ; 1 male, cl 2.4 mm, ZRC 2007.0302 , Spring Anislaq, Cave Valencia , Valencia, coll. B. Sket, Feb.1995 .

Description. – Rostrum ( Fig. 11A ) short, reaching slightly beyond end of basal segment of antennular pedunlcle; rostral formula: 3–6+6–11/1–6. Antennal spine fused with inferior orbital angle. Pterygostomian margin broadly rounded.

Sixth abdominal somite 0.48 times of carapace, 1.9 times as long as fifth somite, slightly shorter than telson. Telson ( Fig. 11B, C ) 3.2 times as long as wide, not terminating in a projection, with 3 pairs of dorsal spinules and 1 pair of dorsolateral spinules; lateral pair of distal spines distinctly longer than intermediate pairs. Preanal carina low, subtriangular, lacking spine.

Eyes well developed, anterior end reaching to 0.7 times length of basal segment of antennular peduncle. Antennular peduncle 0.70 times as long as carapace; basal segment of antennular peduncle as long as both second and third segment lengths, anterolateral angle reaching 0.20 times length of second segment, second segment distinctly longer than third segment. Stylocerite reaching to 0.7 times length of basal segment of antennular peduncle. Scaphocerite 3.6 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 some long, curved setae at posterior end. Palp of first maxilliped rounded, exopod with short flagellum. Podobranch of second maxilliped reduced to a lamina. Third maxilliped reaching beyond end of scaphocerite, with ultimate segment slightly longer than penultimate segment.

Epipods on first 4 pereiopods. First pereiopod ( Fig. 11D ) stout, reaching to middle of second segment of antennular peduncle; merus 1.2 times as long as broad, slightly shorter than carpus; carpus strongly excavated anteriorly, much shorter than chela, as long as high; chela 2.1 times as long as broad; fingers shorter than palm. Second pereiopod ( Fig. 11E ) reaching to end of scaphocerite; merus distinctly shorter than carpus, 3.3 times as long as broad; carpus slightly shorter or as long as chela, 3.9 times as long as high; chela 2.4 times as long as broad; fingers 1.5 times as long as palm. Third pereiopod ( Figs. 11F, G ) reaching beyond end of scaphocerite by length of 1/3 of propodus, propodus 12 times as long as broad, 4.9 times as long as dactylus; dactylus 2.5 times as long as wide (spines included), with 4 accessory spines on flexor margin. Fifth pereiopod ( Figs. 11H, I ) reaching to end of antennular peduncle, propodus 12 times as long as broad, 3.3 times as long as dactylus, dactylus 3.5 times as long as wide (spinules included), terminating in 1 claw, with 51 spinules on flexor margin.

Endopod of male first pleopod ( Fig. 11J ) triangular, one-third length of exopod, no appendix interna. Appendix masculina ( Fig. 11K ) of male second pleopod half length of endopod, with appendix interna half length of appendix masculina, reaching near end of appendix masculina.

Uropodal diaeresis ( Fig. 11L ) with 17 movable spinules.

Habitat. – Caridina anislaq , new species, was collected from Spring Anislaq, near Cave Valencia, Valencia, Bohol Island, central Philippines.

Etymology. – The new species is named after its type locality-Spring Anislaq, Bohol Island, the Philippines, used as a noun in apposition.

Remarks. – Caridina anislaq , new species, is morphologically similar to C. batuan , new species, in the form of rostrum. However, it could be easily separated from C. batuan by the larger number of the post orbital rostral teeth (3–6 vs. 0–2), the stouter merus (1.2 times as long as broad vs. 2.1 times) and the carpus of the first pereiopod (as long as high vs. 1.6 times as long as high) and the shorter flagellum of exopod of the first maxilliped ( Figs. 10 , 11 ).

Figures

Fig. 11. Caridina anislaq, new species: A, cephalothorax and cephalic appendages, lateral view; B, telson; C, distal portion of telson; D, first pereiopod; E, second pereiopod; F, third pereiopod; G, dactylus of third pereiopod; H, fifth pereiopod; I, dactylus of fifth pereiopod; J, endopod of male first pleopod; K, appendix masculina and appendix interna of male second pleopod; L, uropodal diaeresis. Scale bars: A, B = 1 mm; C = 0.2 mm, G, I = 0.1 mm; D–F, H, L = 0.5 mm (males, cl 3.4 mm, paratype, ZRC, spring Anislaq, outside Cave Anislaq, Valencia).

Fig. 10. Caridina batuan, new species: A, cephalothorax and cephalic appendages, lateral view; B, telson; C, distal portion of telson; D, first pereiopod; E, second pereiopod; F, third pereiopod; G, dactylus of third pereiopod; H, fifth pereiopod; I, dactylus of fifth pereiopod; J, uropodal diaeresis. Scale bars: A, B = 1 mm; C = 0.2 mm, D–F, H = 0.5 mm; G, I, J = 0.1 mm (female, cl 3.0 mm, holotype, USC, Cave Kalumpan, Batuan).