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antecessor represents the last common ancestor for H. Our results do not contradict the previous phylogenetic analysis, i.e., that H.
Other criteria (habitat preference, population density, direct and indirect evidence of dietary breadth related to incisor use) are only consistent with the hypothesis under certain conditions. These remains have been recently attributed to a new Homo species named Homo antecessor. The existence of these autapomorphies supports the hypothesis that AMHS is a distinct species from taxa of "archaic" Homo (e.g., Homo neanderthalensis). All these fossils were excavated at the level called TD6 between 19 and have been dated in excess of 780,000 years ago. They differed from Olduvai hominids in terms of less battering of cores, consistent transport behavior, and few productions of side-struck flakes, indicating a regional variation of toolmaking and using practice. Koobi Fora hominids maintained a more static tool-using behavior than their Olduvai counterparts due mainly to a stable supply of raw materials.
These data are inconsistent with the conventional wisdom that stenotopy was a major contributing factor in the extinction of the Paranthropus clade. Examining time trends in the Oldowan technology at Beds I and II, Olduvai Gorge. Institute of History and Anthropology, University of Tsukuba, 1-1-1 Ten'noudai, Tsukuba, Ibaraki, Japan 305-8571.