Incisor Alveoli Prognathism

This character is defined by the prognathism of the incisor complex relative to the bi-canine line; this is distinct from the previous character (subnasal prognathism-angle) because this character measures the degree of anterior migration of the incisor complex, while the previous character measures degree of subnasal prognathism, relative to height of the nasal clivus. As such, this feature helps measure degrees of incisor crowding as well as the anterior or posterior migration of the incisor complex relative to the bi-canine line.

Only two character states are recognized here. The primitive condition of the incisor alveoli anterior to the bi-canine line (= 0) is observed in Dryopithecus, Graecopithecus, Pongo, Gorilla, Pan, Sahelanthropus, the "anamensis group" (C.V. Ward et al., 2001), Praeanthropus, Australopithecus, the "garhi group," H. habilis, H. ergaster, and H. sapiens. The derived condition of the incisor alveolar being close to or aligned with the bi-canine line (= 1) is observed in both species of Kenyanthropus and the species within Paranthropus (see Strait et al., 1997; Strait & Grine, 2001; M.G. Leakey et al., 2001; Brunet et al., 2002).

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  • Ferumbras
    What are alveoli aligned with?
    8 years ago

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