Macrobrachium scabriculum ( Heller, 1862 )

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 : 266

Macrobrachium scabriculum ( Heller, 1862)

Palaemon scabriculus Heller, 1862: 527 [type locality: Sri Lanka] – Henderson & Matthai, 1910: 296, Pl. 17 Fig. 7 a-c, Pl. 18 Fig. 7 a-p.

Macrobrachium scabriculum (part) – Holthuis, 1950: 224; Chace & Bruce, 1993: 37; Johnson, 1973: 15; Yeo, Cai & Ng, 1999: 231, Figs. 18; 19.

Material examined. – 1 male, cl 12 mm, UR, San Francisco River , Surigao Del Nork, Mindanao Island, Philippines, 25 Jul.1985 .

Remarks. – Yeo et al. (1999) and Cai & Ng (2002) recently reviewed the species group of Macrobrachium scabriculum , which share the common characters of velvety pubescence pattern on the major male second chelipeds, i.e. the velvety pubescence cover the proximal half of fingers and almost the whole surface of the palm. There are three species in the group, namely M. scabriculum ( Heller, 1862) , distributed from Sri Lanka, India, Peninsular Malaysia, Sumatra and north Borneo; M. dolichodactylus ( Hilgendorf, 1879) , distributed in eastern Africa and M. lanatum Cai & Ng, 2002 , from Myanmar and Peninsular Malaysia. The three species could be differentiated from each other by forms of rostrum, the proportion of the various joints of the second chelipeds, the teeth arrangement in the cutting edges of fingers. The single specimen of the present species from Mindanao, with the carpus shorter than palm, palm stout, and the teeth in the cutting edges of finger of major second cheliped are descented in size distally, clearly belongs to M. scabriculum . This is the first record for Philippines and also the eastern most record for the species.

Distribution. – Sri Lanka, Malay Peninsula, 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.