†Pongo pygmaeus kahlkei Schwartz et al. 1995 (Bornean orangutan)
Mammalia - Primates - Hominidae
Full reference: J. H. Schwartz, V. T. Long, N. L. Cuong, L. T. Kha, and I. Tattersall. 1995. A review of the Pleistocene hominoid fauna of the Socialist Republic of Vietnam (excluding Hylobatidae). Anthropological Paper of the American Museum of Natural History 76:1-23
Belongs to Pongo pygmaeus according to J. H. Schwartz et al. 1995
Sister taxa: Pongo pygmaeus ciochoni, Pongo pygmaeus devosi, Pongo pygmaeus fromageti, Pongo pygmaeus morio
Type specimen: IAH TK 65/149, a tooth (left /M1 or M2)
Ecology: arboreal frugivore-folivore
Distribution: found only at Tham Khuyen (Quaternary of Vietnam)