Caridina valencia, 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 : 78-80

Caridina valencia , new species

( Fig. 9 )

Material examined. – Holotype: Male, cl 3.5 mm, USC, spring Anislaq, outside, Valencia, coll. B. Sket, Feb.1995.

Paratypes: 5 males, cl 2.5–3.6 m, 92 juveniles, UOL, data same as holotype .

Others: 1 juvenile, UOL, spring Badyang , cave, Valencia, coll. B. Sket, Feb.1995 ; 1 male, cl 3.1 mm, 1 female, cl 2.8 mm, 1 female (damaged), 1 juvenile, UOL, Cave Castigio , Batuan, coll. B. Sket, Feb.1995 ; 4 males, cl 2.2–2.4 mm, 15 females, cl 2.0– 3.1 mm, 2 ovigerous females, cl 2.8–3.1 mm, ZRC 2007.0297 , spring below Cave Serpia , Ginguyuran, Dimiao, coll. B. Sket, Feb.1995 ; 1 male, cl 3.6 mm, 8 juveniles, ZRC 2007.0298 , spring Anislaq , cave, Valencia, coll. B. Sket, Feb.1995 .

Description. – Rostrum ( Fig. 9A ) short, reaching near end of basal segment of antennular pedunlcle; unarmed. Antennal spine fused with inferior orbital angle. Pterygostomian margin sub-rectangular.

Sixth abdominal somite 0.43 times of carapace, 1.8 times as long as fifth somite, slightly shorter than telson. Telson ( Fig. 9B ) 2.7 times as long as wide, not terminating in a projection, with 4 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 0.63 times as long as carapace; basal segment of antennular peduncle distinctly longer than 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. Endopod of second maxilliped slender. Third maxilliped reaching beyond end of scaphocerite, with ultimate segment slightly longer than penultimate segment.

Epipods on first 4 pereiopods. First pereiopod ( Fig. 9C ) stout, reaching to end of second segment of antennular peduncle; merus 1.6 times as long as broad, slightly shorter than carpus; carpus excavated anteriorly, shorter than chela, 1.3 times as long as high; chela 1.6 times as long as broad; fingers slightly shorter than palm. Second pereiopod ( Fig. 9D ) reaching beyond end of scaphocerite; merus distinctly shorter than carpus, 3.3 times as long as broad; carpus 1.2 times as long as chela, 4.5 times as long as high; chela 2.5 times as long as broad; fingers 1.5 times as long as palm. Third pereiopod ( Figs. 9E, F ) reaching beyond end of scaphocerite by length of dactylus, propodus 10 times as long as broad, 4.3 times as long as dactylus; dactylus 3.0 times as long as wide (spines included), with 5 or 6 accessory spines on flexor margin. Fifth pereiopod ( Figs. 9G, H ) reaching beyond end of scaphocerite, propodus 15 times as long as broad, 3.0 times as long as dactylus, dactylus 3.5 times as long as wide (spinules included), terminating in 1 claw, with 56 spinules on flexor margin.

Endopod of male first pleopod ( Fig. 9I ) triangular, one-third length of exopod, no appendix interna. Appendix masculina of male second pleopod ( Fig. 9J ) half length of endopod, with appendix interna half length of appendix masculina, reaching near end of appendix masculina.

Uropodal diaeresis ( Fig. 9K ) with 17 movable spinules. Ovigerous females with egg sized 0.90 × 0.65 mm.

Habitat. – Caridina valencia , new species, was collected from several caves in the southern part of Bohol Island, central Philippines.

Etymology. – The new species is named after its type locality- Valencia Town, Bohol Island, Philippines. The name is used as a noun in apposition.

Remarks. – Caridina valencia , new species, morphologically resembles C. cebuensis Cai & Shokita, 2006a , from Cebu Island, central Philippines. But it could be easily differentiated from C. cebuensis by the much stouter carpus of the first pereiopod (1.3 times as long as high vs. 1.6 times); the slender scaphocerite (3.6 times as long as broad vs. 3.1 times); and more spinules on the dactylus (56 vs. 39) ( Fig. 9 ; cf. Cai & Shokita, 2006a: Figs. 1 , 2 ).

Figures

Fig. 9. Caridina valencia, new species: A, cephalothorax and cephalic appendages, lateral view; B, distal portion of telson; C, first pereiopod; D, second pereiopod; E, third pereiopod; F, dactylus of third pereiopod; G, fifth pereiopod; H, dactylus of fifth pereiopod; I, endopod of male first pleopod; J, appendix masculina and appendix interna of male second pleopod; K, uropodal diaeresis. Scale bars: A = 1 mm; B, F, H = 0.1 mm; C–E, G = 0.5 mm; I–K = 0.2 mm. (males, cl 3.4 mm, paratype, ZRC, spring Anislaq, outside Cave Anislaq, Valencia).

Fig. 1. Map of the Bohol Island, Philippines, showing the collection sites.

Fig. 2. Caridina lobocensis, new species: A, cephalothorax and cephalic appendages, lateral view; B, scaphocerite; C, mandible; D, maxillula; E, maxilla; F, first maxilliped; G, second maxilliped; H, third maxilliped. Scale bars: A = 2 mm, B–H = 1 mm (female, cl 6.9 mm, Paratype, ZRC, Philippines).