Sus bucculentus was described from two skulls collected in southern Viet Nam in 1892, supposedly from near Ho Chi Minh City in the Dong-nai Valley. Another specimen (an incomplete but apparently fresh skull of a juvenile male) has been reported from Ban Ni Giang in the Annamite Mountains in Lao PDR, east of the Mekong River (18º19'N, 104º44'E) (Groves et al. 1997; Meijaard et al. 2002). However, recent analysis of mitochondrial DNA data (Robins et al. 2006) suggest that the light-coloured, lankier, longer-faced pigs from the northern Annamites are probably the same as the relatively light-colored form of Sus scrofa found east of the Mekong (Galbreath 2007). The validity of this species is therefore in doubt, and it might be a synonym of Sus scrofa.