The hominin and most of the faunal elements consist exclusively of teeth, and many of them present root alterations mostly due to the effects of calcium dissolution and some rodent gnawing. The mammalian fossil assemblage from the Daoxian site is typical of Late Pleistocene in southern China, and is composed of 38 species including 5 extinct large mammals such as Ailuropoda baconi, Crocuta ultima, Stegodon orientalis, Megatapirus augustus and Sus sp. Study’s co-lead author WU Xiujie, a Paleoanthropologist of the IVPP, said the 47 human teeth came from at least 13 individuals.
The Daoxian teeth are small and they consistently fall within H. sapiens variability. They are generally smaller than other Late Pleistocene specimens from Africa and Asia, and closer to European Late Pleistocene samples and contemporary modern humans. Both the crown and the root of Daoxian teeth show typical morphologies for H. sapiens, with simplified occlusal and labial/buccal surfaces and short and slender roots. The presence of moderate basal bulging as well as longitudinal grooves in the buccal surface of canines, premolars and molars from other Late Pleistocene samples such as Xujiayao, Huanglong Cave, Qafzeh or Dolni Vestonice make Daoxian teeth morphologically closer to middle-to-late Late Pleistocene and even contemporary human samples.
The data filled a chronological and geographical gap that was relevant for understanding when H. sapiens first appeared in southern Asia. The Daoxian teeth also supported the hypothesis that during the same period, southern China was inhabited by more derived populations than central and northern China. This evidence was important for the study of dispersal routes of modern humans.
Some studies have investigated how the competition with H. sapiens may have caused Neanderthals' extinction. Notably, although fully modern humans were already present in southern China at least as early as 80,000 years ago, there is no evidence that they entered Europe before 45,000 years ago.
The species made it to southern China tens of thousands of years before colonizing Europe perhaps because of the entrenched presence of the Neanderthals, in Europe and the harsh, cold European climate. In addition, it is logical to think that dispersals toward the east were likely environmentally easier than moving toward the north, given the cold winters of Europe. It may have been hard to take over land Neanderthals had occupied for hundreds of thousands of years.
The Daoxian teeth place species in southern China 30,000 to 70,000 years earlier than in the eastern Mediterranean or Europe. Scientists hope these Daoxian human fossil discovery will make people understand that East Asia is one of the key areas for the study of the origin and evolution of modern humans.