A nasal keel is defined by the presence of a distinct vertical "pinching" of the nasal bones along its midline, defining a nasal keel (= 0). When present, a nasal keel is usually pronounced in the region between the orbits, flattening out inferiorly before the superior nasal margin. As discussed earlier (character 54), the morphology of the nasal bones appears early in ontogeny and is thus considered of developmental and phylogenetic interest. A nasal keel is observed only in Graecopithecus (de Bonis & Koufos, 1993), Gorilla, Australopithecus (Rak, 1983), and H. habilis (Tobias, 1967).
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