The freshwater prawns of the genus Macrobrachium Bate, 1868, of Thailand (Crustacea: Decapoda: Palaemonidae) Cai, Y. Naiyanetr, P. Ng, P. K. L. Journal of Natural History 2004 2004-10-10 38 5 581 649 5a15a60d-bee9-4fe6-840e-27dabbb61816 Dana, 1852 Dana 1852 [580,1001,798,823] Malacostraca Palaemonidae Macrobrachium GBIF Animalia Decapoda 9 589 Arthropoda species equidens  1980: 501, figure (under the name of  M. idae, see Remarks under  M. idae); Naiyanetr, 1980: 17; 1992: 18; 1998: 32; Chace and Bruce, 1993: 25, figure 4; Yeo et al., 1999: 226.?  Macrobrachium nipponense: Lumubol, 1980: 504, figure.  Material examined  Central   Thailand. Two WW, cl 22.6–23.9 mm, 1 ovigerous X, cl 21.9 mm(CU 1997.233), Nonthaburi,  10 February 1980; seven specimens, cl 9.0– 14.4 mm(CU 1997.234), Samut Prakarn,  15 March 1981; 1 W, cl 21.6mm, 9 ovigerous X, cl 15.4–19.9mm(CU 1997.235), Samut Sakhon,  30 October 1980; 3 WW, cl 13.6–20.7 mm, 2 XX, cl 11.8–18.6 mm(CU 1997.236), Samut Sakhon,  13 December 1980; 7 ovigerous XX, cl 12.6–16.0 mm (CU 1997.237), Samut Prakarn,  18 October 1980; 3 WW, cl 14.7–19.4 mm, 1 X, cl 20.5 mm(CU 1997.238), Samut Songkhram,  21 March 1980; 4 XX(2 ovigerous), cl 19.0– 20.6 mm(CU), Samut Songkhram,  13 December 1980; 3 ovigerous XX, cl 15.3–22.0 mm (CU 1997.240), Nonthaburi,  May 1980.  South   Thailand. Ten WW, cl 14.0–20.0 mm, 29 ovigerous XX, cl 20–21.5 mm(CU 1997.9), Narathiwat,  15 June 1983; 9 WW, cl 13.0–17.0 mm, 26 XX(2 ovigerous), cl 10.0– 17.5 mm(CU), Narathiwat(from market),  11 January 1993; 1 W, cl 14.0 mm (CU 1997.14), Ranong(from mangrove),  27 July 1988; 4 WW, cl 20.0–24.0 mm, 2 ovigerous XX, cl 17.0 mm (CU), Trang,  29 October 1988; 2 WW, cl 20–24 mm, 1 ovigerous X, cl 16 mm( ZRC 2000.2717), Trang, coll. P. Naiyanetr,  29 October 1988.  Thai specimens with no specific locality. Two XX, cl 15.1–20.4 mm(CU 1997.75); 8 ovigerous XX, cl 20.5–28.0 mm (CU 1997.71); 19 ovigerous XX, cl 18.0–21.0 mm (CU 1997.81); 43 specimens(CU 1997.83).  Remarks   Macrobrachium equidensis usually a brackish water species, with smaller specimens being commonly found in mangrove creeks. The species is characterized by its upturned and sinuous rostrum. The variation in rostral form and body colour is considerable and this can sometimes cause taxonomic confusion.  Macrobrachium equidenshas previously been recorded from southern and central Thailandby Lanchester (1902), Kemp (1918a), Suvatti (1937), Holthuis (1950) and Naiyanetr (1980). It is known from a very wide area in the Indo-West Pacific, from Madagascarto the Solomon Islands. On the basis of his figures, specimens identified as ‘  Macrobrachium nipponense’ by Lumubol (1980: 504)probably belong to this species as well. 1980-02-10 Two WW Thailand Nonthaburi 9 589 1 Nonthaburi 1981-03-15 Thailand Samut Prakarn 9 589 1 1980-10-30 Thailand Samut Sakhon 9 589 1 Samut Sakhon 1980-12-13 Thailand Samut Sakhon 9 589 1 Samut Sakhon 1980-10-18 Thailand Samut Prakarn 9 589 1 1980-03-21 Thailand Samut Songkhram 9 589 1 Samut Songkhram 1980-12-13 Thailand Samut Songkhram 9 589 1 Samut Songkhram 1980-05 Thailand Nonthaburi 9 589 1 Nonthaburi 1983-06-15 Ten WW Thailand Narathiwat 9 589 1 Narathiwat 1993-01-11 Thailand Narathiwat 9 589 1 Narathiwat 1988-07-27 Thailand Ranong 9 589 1 Ranong 1988-10-29 Thailand Trang 9 589 1 Trang 1988-10-29 ZRC P. Naiyanetr Thailand Trang 9 589 ZRC 2000.2717 1 Trang