Penghu 1 instead lived on what was then mainland Asia in an ecosystem that included many other animals.
"The associated faunal remains suggest that the area was a relatively open, wet woodland," Kaifu said. "This is because of the presence of large-bodied mammals, such as elephants (Stegodon), horses and bear, but the fauna also included animals that prefer marshlands in a hot and humid climate, such as water buffaloes."
With such natural resources, it's not hard to imagine why archaic humans were attracted to the site. While Penghu 1's precise identity remains a mystery for now, one thing is for certain: this big-toothed human was not a member of our species.
"This jaw is clearly not from a modern human and the proposal that it may belong to an ancestor related to, or a descendant of, Homo erectus is a reasonable one," Bernard Wood of George Washington University's Center for the Advanced Study of Human Paleobiology, told Discovery News.
Wood continued, "We know precious little about human evolution in China and Southeast Asia at this time, so the possibility that more fossil evidence may come from the seabed in the Penghu Channel is an exciting prospect."