Hydrachna simulans Marshall, 1928 Material examined — Cambodia, 15-34-1 Angkor, ancient swimming pool of the king (named: Srah Srang acc. to Google Earth, 2015), 13°25’56.3"N, 103°54’18.5"E, alt. 27 m a.s.l., water depth 0.1 m, substrate: sand covered by a thin layer of detritus, some submersed macrophytes; 23.iv.2015, 1/0/0. Remarks — Lundblad (1969) placed Hydrachna similis Cook, 1967, H. mysorensis Cook, 1967 and H. kloomi Imamura, 1964 in synonymy under H. simulans. This treatment was followed by Peši´c et al. (2010), and by us here. Distribution — China, Thailand, India, Cambodia.Published as part of Pešic, V. & Smit, H., 2016, New records of water mites from Southeast Asia (Acari: Hydrachnidia) with the description of two new genera and 12 new species, pp. 393-433 in Acarologia 56 (3) on page 394, DOI: 10.1051/acarologia/20162251, http://zenodo.org/record/539597