The clivus is convex (= 0) in Dryopithecus (Begun, 1992; Cameron, 1995), Graecopithecus, Pongo, Gorilla, Pan, members of the "anamensis group," Praeanthropus, the "garhi group," and H. sapiens (see Strait et al., 1997; Strait & Grine, 2001; C.V. Ward et al., 2001). The clivus is flat (= 1) in Sahelanthropus, both species of Kenyanthropus, Australopithecus, H. habilis, and H. ergaster (Strait et al., 1997; M.G. Leakey et al., 2001; Strait & Grine, 2001; Brunet et al., 2002). The clivus is concave with a developed gutter (= 2) in species of Paranthropus (Strait et al., 1997; Strait & Grine, 2001).
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