Caridina boholensis, 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 : 75-78

Caridina boholensis , new species

( Figs. 7 , 8 )

Material examined. – Holotype: Male cl 3.9 mm, USC, Quila Cave , Nueva Vida Norte, Batuan, coll. B. Sket, Feb.1995.

Paratypes: 87 males, cl 3.0– 4.2 mm, 115 females, cl 2.7–4.7 mm, 1 ovigerous females, 3.8 mm, eggs 0.75 x 0.50 mm, UOL, data same as holotype ; 10 males, cl 3.0– 4.2 mm, 10 females, cl 2.7–4.7 mm, 1 ovigerous females, 4.6 mm, eggs 0.75 × 0.50 mm, ZRC 2007.0285 , data same as holotype .

Others: Nine males, cl 2.8–3.8 mm, 5 females, cl 37– 3.8 mm, 11 juveniles, ZRC 2007.0286 , Cave Bones , Canla-As village, Antequrra, coll. Y. Cai et al., 16 Dec.2000 ; 41 males, cl 2.6–3.5 mm, 38 females, cl 2.9–4.1 mm, ZRC 2007.0287 , Cave Bongkawi , Canla-As village, Antequrra, coll. Y. Cai. et al., 16 Dec.2000 ; 3 males, cl 3.0– 3.8 mm, 11 females, cl 2.3–3.8 mm, ZRC 2007.0288 , spring outside cave Bones , Canla-As village, Antequrra, coll. P. K. L. Ng & L. Liao, 16 Dec.2000 ; 6 males, cl 2.8–3.4 mm, ZRC 2007.0289 , spring outside Cave Inabacan , Antequrra, coll. Y. Cai et al., 18 Dec.2000 ; 22 males, cl 3.0–4.0 mm, 37 females, cl 2.2–3.3 mm, 15 juveniles, ZRC 2007.0290 , Cave Serpia , Ginguyuran, Dimiao, coll. B. Sket, Feb.1995 ; 1 juvenile, ZRC 2007.0291 , Cave Camulaon , lower part, Cugon, Jagna, coll. B. Sket, Feb.1995 ; 7 juveniles, ZRC2007.0292 , spring no.1, Roxas Park , Garcia-Hernandez, coll. B. Sket, Feb.1995 ; 4 juveniles, ZRC 2007.0293 , spring no. 2, Roxas Park , Garcia-Hernandez, coll. B. Sket, Feb.1995 ; 6 juveniles, ZRC 2007.0294 , spring Anislaq , outside, Valencia, coll. B. Sket, Feb.1995 ; 2 juveniles, ZRC 2007.0295 , spring below Cave Serpia , Ginguyuran, Dimiao, B. Sket, Feb.1995 ; 23 juveniles, ZRC 2007.0296 , spring Anislaq , outside, Velencia, coll. B. Sket, Feb.1995 .

Description. – Rostrum ( Figs. 7A , 8A ) very short, reaching near end of basal segment of antennular peduncle; unarmed dorsally or armed dorsally with indistinct small teeth, unarmed ventrally. Antennal spine indistinct, fused with inferior orbital angle. Pterygostomian margin broadly rounded.

Sixth abdominal somite 0.45 times of carapace, 1.8 times as long as fifth somite, as long as telson. Telson ( Figs. 7B, C ) 2.8 times as long as wide, not terminating in a projection, with 3 or 4 pairs of dorsal spinules and 1 pair of dorsolateral spinules; lateral pair of spines distinctly longer than intermediate pairs. Preanal carina high, sub-triangular, lacking spine.

Eyes reduced, anterior end reaching to 0.3–0.4 times length of basal segment of antennular peduncle. Antennular peduncle 0.64 times as long as carapace; basal segment of antennular peduncle shorter 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 0.8 times length of basal segment of antennular peduncle. Scaphocerite ( Fig. 7D ) 3.5 times as long as wide.

Incisor process of mandible ( Fig. 7E ) ending in irregular teeth, molar process truncated. Lower lacinia of maxillula ( Fig. 7F ) broadly rounded, upper lacinia elongated, with a number of distinct teeth on inner margin, palp slender. Upper endites of maxilla ( Fig. 7G ) subdivided, palp short, scaphognathite tapering posteriorly with some long, curved setae at posterior end. Palp of first maxilliped ( Fig. 7H ) broadly triangular. Second maxilliped ( Fig. 7I ) typical of genus. Third maxilliped ( Fig. 7J ) reaching to end of antennular peduncle, with ultimate segment slightly shorter than penultimate segment.

Epipods on first four pereiopods. First pereiopod ( Figs. 7K , 8B ) reaching beyond end of basal segment of antennular peduncle; merus 2.3 times as long as broad, shorter than carpus; carpus excavated anteriorly, shorter than chela, 2.0 times as long as high; chela 2.3 times as long as broad; fingers slightly longer than palm. Second pereiopod ( Figs. 7L , 8C ) reaching to end of scaphocerite; merus distinctly shorter than carpus, 4.4 times as long as broad; carpus 1.2 times as long as chela, 6.9 times as long as high; chela 3.7 times as long as broad; fingers 1.6 times as long as palm. Third pereiopod ( Figs. 8D, E , 9E, F ) reaching beyond end of scaphocerite by length of dactylus, propodus 10 times as long as broad, 3.7 times as long as dactylus; dactylus 3.0 times as long as wide (spines included), with 4 or 5 accessory spines on flexor margin. Fifth pereiopod ( Figs. 8F, G , 9G, H ) reaching to end of scaphocerite, propodus 15 times as long as broad, 3.6 times as long as dactylus, dactylus 3.4 times as long as wide (spinules included), terminating in 1 large claw, with 62 spinules on flexor margin.

Endopod of male first pleopod ( Fig. 8H ) sub-triangular, a quarter length of exopod, no appendix interna. Appendix masculina of male second pleopod ( Fig. 8I ) half length of endopod, with appendix interna 0.4 times length of appendix masculina.

Uropodal diaeresis ( Fig. 8J ) with 17 movable spinules.

Ovigerous females with eggs sized 0.75–0.85 × 0.50–0.60 mm.

Habitat. – Caridina boholensis , new species, was collected from several locations of subterranean water in Bohol, either from cave streams or spring water near caves.

Etymology. – The new species is named after its type locality-Bohol Island, the Philippines.

Remarks. – Caridina boholensis , new species, is most similar to C. cebuensis Cai & Shokita, 2006 , from Cebu Island, central Philippines. However, it could be differentiated by the much reduced eyes, the slender carpus of first pereiopods (2.0 times as long as high vs. 1.6 times in C. cebuensis ) and the slender carpus of second pereiopod (6.9 times as long as high vs. 4.4 times). Caridina boholensis is the most common subterreanean Caridina species in Bohol Island.

Figures

Fig. 7. Caridina boholensis, new species: A, cephalothorax and cephalic appendages, lateral view; 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. Scale bars: A, B, D = 1 mm, E–L = 0.5 mm, C = 0.1 mm (male, cl 3.7 mm, paratype, ZRC, Cave Bongkawi, Antequrra).

Fig. 8. Caridina boholensis, new species: A, cephalothorax and cephalic appendages, lateral view; B, first pereiopod; C, second pereiopod; D, third pereiopod; E, dactylus of third pereiopod; F, fifth pereiopod; G, dactylus of fifth pereiopod; H, male first pleopod; I, appendix masculina and appendix interna of male second pleopod; J, uropodal diaeresis. Scale bars: A = 1 mm; B–D, F = 0.5 mm; E, G = 0.1 mm; H–J = 0.2 mm (A–C, ovig. females, cl 3.8 mm, paratype, ZRC; D–J, male, cl 3.7 mm, paratype, ZRC, Cave Bongkawi, Antequrra).

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).