Upper Incisor Heteromorphy I AreaI Area

The intermediate condition is defined by index values of 1.27-2.05 (n = 92). Reduced heteromorphy is defined by a value less than 1.27; increased heteromorphy has a value greater than 2.05 (Cameron, 1997a). The minimum value is 1.09 and the maximum value is 2.84. Increased heteromorphy (= 0) is observed in Graecopithecus with a mean index of 2.62 (Cameron, 1998) and Pongo with a mean of 2.31 (n = 18). The intermediate condition (= 1) is observed in Praeanthropus with a mean index of 1.62 (n = 5/8 [data from B.A. Wood, 1991; see also Tobias, 1980]), Australopithecus with amean index of 1.93 (n = 3 to 5 [B.A. Wood, 1991; see also Tobias, 1980]), P. boisei specimen OH 5 with an index of 1.54, P robustus with a mean index of 1.48, H. habilis with a mean index of 1.73, Gorilla with a mean index of 1.57 (n = 23), Pan with a mean index of 1.45 (n = 51), and H. sapiens with a mean index of 1.40 (n = 56/126 [data from Thorne, 1976]). While no data are directly available for K. platyops, M.G. Leakey et al. (2002) describe the preserved central and lateral incisor roots with an index of just 90%, whereas they are typically 50-70% in other known hominin taxa. Thus K. platyops is allocated as having reduced heteromorphy (= 2).

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