Caridina camaro, 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 : 82-85

Caridina camaro , new species

( Fig. 12 )

Material examined. – Holotype: Female, cl 4.3 mm, USC, Cave Camaro, Batuan, coll. B. Sket, Feb.1995.

Paratypes: Six more or less damaged specimens, ZRC 2007.0303 , data same as holotype .

Description. – Rostrum ( Fig. 12A ) short, reaching slightly beyond end of basal segment of antennular pedunlcle; rostral formula: 2+10/5. Antennal spine fused with inferior orbital angle. Pterygostomian margin broadly rounded.

Sixth abdominal somite 0.48 times of carapace, 1.8 times as long as fifth somite, slightly shorter than telson. Telson ( Figs. 12B, C ) 2.7 times as long as wide, not terminating in a projection, with 4 or 5 pairs of dorsal spinules and 1 pair of dorsolateral spinules; lateral pair of distal spines distinctly longer than intermediate pairs. Preanal carina low, sub-triangular, lacking spine.

Eyes reduced, anterior end reaching to 0.4 times length of basal segment of antennular peduncle. Antennular peduncle 0.60 times as long as carapace; basal segment of antennular peduncle distinctly as long as both second and third segment lengths, anterolateral angle reaching 0.20 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 3.2 times as long as wide.

Incisor process of mandible ending in irregular teeth, molar process truncated. Lower lacinia of maxillula broadly rounded, upper lacinia elongate, 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 slender, with ultimate segment as long as penultimate segment.

Epipods on first 4 pereiopods. First pereiopod ( Fig. 12D ) slender, merus 2.4 times as long as broad, shorter than carpus; carpus excavated anteriorly, shorter than chela, 1.8 to 3.0 times as long as high; chela 2.7 times as long as broad; fingers 1.4 times as long as palm. Second pereiopod ( Fig. 12E ) elongated and slender, merus distinctly shorter than carpus, 6.0 times as long as broad; carpus 1.5 times as long as chela, 7.7 times as long as high; chela 3.7 times as long as broad; fingers 1.9 times as long as palm. Third pereiopod ( Figs. 12F, G ) with propodus 16 times as long as broad, 4.4 times as long as dactylus; dactylus 5.6 times as long as wide (spines included), with 6 accessory spines on flexor margin. Fifth pereiopod ( Figs. 12H, I ) with propodus 15 times as long as broad, 3.3 times as long as dactylus, dactylus 5 times as long as wide (spinules included), terminating in 1 claw, with 60 spinules on flexor margin.

Uropodal diaeresis ( Fig. 12J ) with 17 movable spinules.

Habitat. – Caridina camaro , new species, was collected from the subterranean stream in Cave Camaro, Bohol Island, central Philippines.

Etymology. – The new species is named after its type locality—Cave Camaro, Bohol Island, the Philippines. The name is used as a noun in apposition.

Remarks.- With regard to the slender pereiopods, Caridina camaro , new species, is morphologically similar to C. liaoi , new species. It can be easily differentiated from the latter species by the reduced eyes, and the much shorter rostrum. Compared with all the other cave species in Bohol, C. camaro has more elongated carpus of the first pereiopods, hence, could readily be distinguished from C. valencia , C. batuan and C. anislaq (1.8–3.0 times as long as high vs. 1.0–1.6 times in the latter three species). It can be separated from C. boholensis by the slender dactylus of third pereiopod (5.6 times as long as wide vs. 3.0 times)

Figures

Fig. 12. Caridina camaro, 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, K = 0.1 mm; B, F, H = 0.1 mm; C–E, G = 0.5 mm; I, J = 0.2 mm (females, cl 4.3 mm, holotype, USC, Cave Camaro, Batuan).