Mamersa paddicola Jin & Guo, 1993 New records of water mites from standing waters in Thailand, with the description of nine new species (Acari: Hydrachnidia) Smit, Harry Zootaxa 2017 2017-08-28 4312 1 69 91 Walter, 1911 Walter 1911 [151,500,1506,1533] Arachnida Hydryphantidae Mamersa GBIF Animalia Trombidiformes 1 70 Arthropoda species rouxi    Mamersa paddicola Jin & Guo, 1993—new syn.     Materialexamined.1/1/0, Nong Chang Yai Reservoir, Ubon Ratchathani Province, 15° 23.874ʹ N, 104° 49.756ʹ E,  25-x-2010.   Description. See Walter (1911)and Viets (1935). Additional characters: Male idiosoma 834 long and 753 wide, female idiosoma 899 long and 826 wide. Genital field: male 259 long, and 316 wide, female 267 long and 332 wide. The male has an oblique anterior margin of the genital valve, in the female this margin is straight with a short medial extension. The pre-genital sclerite of the male is rhomboid in the male and triangular in the female. The configuration of the mediodorsal plates dg5 and dg6 (cf. Harvey1988) of both sexes is asymmetrical.   Remarks. Jin & Guo (1993)stated that, in describing  M. paddicola Jin & Guo, 1993, the new species differed in the presence of two pairs of posterolateral plates. However, they overlooked  M. rouxi, a species they did not mention in the paper. Their illustrations match the description of the latter species, and we therefore propose to synonymize  M. paddicolawith  M. rouxi. The differences in the shape of the pre-genital sclerite and the genital valves was not mentioned by Viets (1935). The species is new for the fauna of Thailand. It has been found on the Aru Islands, Sumatraand Sulawesi( Indonesia, Wiles pers. comm.), Chinaand Thailand(present study). 1587010381 2010-10-25 Nong Chang Yai Reservoir Material 1 70 1 Ubon Ratchathani Province