Macrobrachium placidulum ( De Man, 1892 )

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 : 86

Macrobrachium placidulum ( De Man, 1892)

Palaemon (Macrobrachium) placidulus De Man, 1892: 489 , Pl.

28 Fig. 48 [type localities: Celebes (Sulawesi), Pulau Selajar ,

Flores, and Timor]. Macrobrachium placidulum – Holthuis, 1950: 253, Fig. 51c; Chace

& Bruce, 1993: 35, Fig. 14; Cai & Shokita, 2006a: 264. Macrobrachium placidum – Shokita, 1979: 275. Macrobrachium horstii – Hwang & Yu, 1982: 164, Fig. 5 (not

Palaemon (Parapalaemon) Horstii De Man 1892 ). Macrobrachium cf horstii – Shy & Yu, 1998: 30.

Material examined. – One male, cl 14.2 m, ZRC 2007.0314, Alijanan Bridge, stream, S. Duero, coll. B. Sket, 5 Mar.1999; 3 males, cl 15.3–17.4 mm, ZRC 2007.0315 , river outside Inabacan Cave , Antequrra, coll. Y. Cai et al., 16 Dec.2000 ; 1 male, cl 8.4 mm, 1 female, cl 10.3 mm, ZRC 2007.0316 , river outside Inabacan Cave , Antequrra, coll. Y. Cai et al., 18 Dec.2000 .

Remarks. – Macrobrachium placidulum is a common freshwater species in the Philippines. It is distributed from Ryukyu Islands, Taiwan, the Philippines, Palau, and eastern Indonesia, to New Guinea, as well as Fiji (Chace & Bruce, 1993; Choy, 1984).

Figures

Fig. 5. Caridina liaoi, 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, endopod of male first pleopod; I, appendix masculina and appendix interna of male second pleopod. Scale bars: A–D, F = 1 mm; E, G = 0.1 mm; H, I = 0.2 mm (male, cl 4.0 mm, paratype, ZRC, Bilar river).