Genus Orientalia Dang, 1975 was established by Dang Ngoc Thanh, based on type species Orielltalia glabra Dang [= Potamon (Geothelphusa) glabra Dang, 1967] found in North Vietnam. Unfortunatly, the generic name Orientalia is considered as a junior homonym of the name Orientalia Radoman, 1972 (Mollusca). Yeo et al. (1998,2005), Yeo & Naruse (2007) [8, 9, 10] has commented on this nomenclatural question, and suggested that the name Orientalia Dang, 1975 should be replaced by a junior subjective synonym Hainanpotamon Dai, 1995 established by Dai Ai-yun (1995) [1] based on the type species Hainanpotamon orientalis Parisi, 1916 (instead Hainanpotamon daiae sp. n., according to Yeo & Naruse (2007) [10]) found in Hainan Island. However, a detailed comparison on diagnostic morphological particularities of these two related genera, showed that they are not identical in the structure of male Gonopod