Caridina gracilipes De Man, 1892

Shokita, Yixiong Cai Shigemitsu, 2006, Report On A Collection Of Freshwater Shrimps (Crustacea: Decapoda: Caridea) From The Philippines, With Descriptions Of Four New Species, Raffles Bulletin of Zoology 54 (2), pp. 245-270 : 250

Caridina gracilipes De Man, 1892

Caridina Wyckii var. gracilipes De Man, 1892: 387 , Pl. 24 Fig. 29-

29e [type localities: Sulawesi (Celebes), and Selajar, Indonesia]. Caridina wyckii var. gracilipes – Schenkel, 1902: 498. Caridina nilotica gracilipes – De Man, 1908b: 270, Figs.7a, b ; Ueno,

1935: 272, Fig. 2 ; Yu, 1974; 52, Figs. 2 , 3 . Caridina longirostris – Chace, 1997: 14 (part), Fig. 7 .

Material examined. – 1 male, cl 4.0 mm, 4 ovig. females, cl 4.1-6.3 mm, UR, San Francisco River , Surigao , Del Nork, Mindanao Philippines, 25 Jul.1985 .

Comparative material examined. – Lectotype: 1 ovig. female, cl 5.3 mm, syntypes of Caridina var. gracilipes De Man, 1892 , RMNH D 1317 , Maros River , Sulawesi, Indonesia, coll. Max Weber, Sep.- Oct.1888, present designation . Paralectotypes: 2 females, cl 4.2-4.4 mm, RMNH D 1317 , data same as lectotype. Others : 8 males, cl 3.4-3.8 mm, 10 ovig. females, cl 4.6-5.7 mm, USNM, Tilig , Lubang Island, Mindoro Occidental, Philippines, Albatross Philippine Expedition, 14 Jul.1908 ; 5 males, cl 2.6-3.9 mm, USNM 285324 , Calawagan River , River mouth, Mindoro , Philippines, Albatross Philippines Expedition, 11 Dec.1908 ; 1 male, cl 3.6 mm, 14 ovig. females, cl 4.2-5.5 mm, River mouth, Mindoro , Philippines, Albatross Philippines Expedition, 11 Dec.1908 ; 1 male, cl 3.6 mm, 14 ovig. females, cl 4.3-5.5 mm, USNM 285323 , Nato River , Camarines Sur, Luzon , Philippines, Albatross Philippines Expedition, 18 Jun.1909 ; 3 males, cl 4.0- 4.2 mm, 4 females, cl 4.4- 4.6 mm, USNM 285332 , Lake Ernestine , Cagayan Sulu Island , Palawan, Philippines, Albatross Philippines Expedition, 8 Jan.1909 ; 2 males, cl 3.0 mm, 1 female, cl 4.0 mm, 13 ovig. females, cl 4.5- 5.0 mm, USNM 285321 , Malaga River at Hinunangan Bay , Leyte, Philippines, Albatross Philippines Expedition, 30 Jul.1909 ; 2 females, cl 4.2-4.4 mm, 8 ovig. females, cl 4.2-6.0 mm, USNM 285333 , Passi , Panay Island , Philippines, Albatross Philippines Expedition, no date .

Diagnosis. – Rostrum long, upturn anteriorly, reaching beyond end of scaphocerite; rostral formula: 1-3+11-27+1- 3/8-18; with toothed dorsal margin proportion subequal to length of untoothed proportion. Antennal spine lower than inferior orbital angle. Pterygostomian angle broadly rounded. Sixth abdominal somite 0.59 times of carapace, 1.9 times as long as fifth somite, as long as telson. Telson 4.0 times as long as wide, terminating in a projection, with 4 pairs of dorsal spinules and 1 pair of dorsolateral spinules; distal margin with 3 pairs distal spines, lateral pair distinctly longer than intermediate pairs, sublateral pair shortest. Preanal carina with a spine. Antennular peduncle 0.8-1.05 times as long as carapace; scaphocerite 4.4 times as long as wide. Epipods on first 4 pereiopods. First pereiopod with carpus excavated anteriorly, shorter than chela, 2.0-2.5 times as long as high; chela 2.0-2.7 times as long as broad; fingers distinctly longer than palm. Second pereiopod with carpus 1.4 times as long as chela, 5.4-6.3 times as long as high; chela 2.5-3.2 times as long as broad; fingers 1.6 times as long as palm. Third pereiopod with propodus 10-14 times as long as broad, 3.8- 4.4 times as long as dactylus; dactylus 3.3 times as long as wide (spines included), with 8-9 accessory spines on flexor margin. Fifth pereiopod with propodus 15-19 times as long as broad, 3.1-3.8 times as long as dactylus, dactylus 4.1 times as long as wide (spinules included), with 36-57 spinules on flexor margin. Endopod of male first pleopod subtriangular, 0.25 times length of exopod, no appendix interna, or with a vestige of it. Appendix masculina of male second pleopod half length of endopod. Uropodal diaeresis with 8-12 movable spinules. Eggs 0.42-0.53-x 0.23-0.33 mm in diameter.

Remarks. – Caridina gracilipes De Man, 1892 , is different from C. elongapoda in lacking an appendix interna in the endopod of male first pleopod. Caridina gracilipes can be distinguished from C. longirostris in its elongated carpus of fist pereiopod and dactylus of last three pereiopods. As Caridina gracilipes could be easily separated from all the members of the C. nilotica group, it is here recognized as a distinct species. According to Chace’s (1997: Fig. 7 ) drawings, at least part of his C. longirostris , e.g. specimens from Nato River, lagonoy Gulf, are indeed C. gracilipes . Reexamination of Albatross Philippines Expedition specimens confirms this assumption (see comparative material examined for details). C. gracilipes has been reported from Taiwan, southern China and Sulawesi and is now recorded from Philippines for the first time.

Distribution. – Sulawesi, Taiwan, mainland China, Philippines.

Figures

Fig. 7. Caridina mindanao, new species, ovig. female, cl 3.8 mm, Mindanao, Philippines: A, cephalothorax and cephalic appendages; B, abdomen and telson; C, scaphocerite; D, mandible; E, maxillula; F, maxilla; G, first maxilliped; H, second maxilliped. Scale bars: A, B = 1 mm; C, H = 0.5 mm.

Fig. 2. Caridina cebuensis, new species, male, cl 2.5 mm, paratype, Cebu, Philippines:A, third pereiopod; B, dactylus of third pereiopod; C, fifth pereiopod; D, dactylus of fifth pereiopod; E, endopod of male first pleopod; F, appendix masculina and appendix interna of male second pleopod. Scale bars: A, C = 0.5 mm; B, D-F = 0.1 mm.

Fig. 3. Caridina buhi, new species, ovig. female, cl 4.0 mm, holotype, NSMT, Binahugan River, Buhi, Camarines Sur, Luzon, Philippines: 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, preanal carina; K, uropodal diaeresis. Scale bars: A = 1 mm, B, D-F, H, J = 0.5 mm; C, G, I, K = 0.2 mm.