Abstract: Fossil teeth of Pongo were discovered in the 1930's in China but they were bought from traditional Chinese medicine stores. Fossils of Pongo found many times afterwards, were only identified as Pongo sp. Eighty-three Orang-Utan teeth derived from Luoding county, Yunfu county in Guangdong Province and some from three localities in Guangxi Zhuang Autonomous Region are reported in this paper.
We found that growth lines appear in the great majority of teeth from P4/3—M3 which have moderate wear and retain wrinkles (crenulations) . The morphological characters of these Orang-Utan teeth show that the subspecies Pongo pygmaeus weidenreichi Hooijer 1948 is valid and should be retained.

Key words: Pleistocene; Fossil Pongo teeth; Wrinkle; Growth lines