Figure 1. Comparison of the Longgupo P4-M1 with these teeth (and the P3 when preserved) in the left lower dentitions of some other primates. From left to right the specimens are Pongo, Sivapithecus, Lufengpithecus PA 580, Longgupo (position of the interproximal facet for the P3 indicated) and Mauer (an earlier Middle Pleistocene European with only slightly worn postcanine teeth). The figure is combined from drawings in Huang Wanpo et. al. (1995), Xu Qinghua and Lu Qingwu (1979), and Gregory (1922)