Abstract

The cranium and associated matrix of Sts 5, a cranium of Australopithecus africanus is re-examined in the context of an unfused sagittal suture and the position of the temporal lines. These lines are not developed as a sagittal crest although they are close to the mid-sagittal line. A comparative study of the presence of sagittal crests in male, female, juvenile and adult specimens of extant great apes ( Gorilla , Pan , Pongo ) suggests that the existence of a sagittal crest is influenced to a greater extent by anatomical age rather than by the sex of the individuals. Le réexamen du cranium de Sterkfontein, Sts 5 ( Australopithecus africanus ), et du fragment de brèche associé, montre l'existence d'une suture sagittale non fusionnée et d'une position haute des lignes temporales supérieures. Ces lignes, bien que proches de la suture sagittale, ne forment pas de crête. Une étude comparative des fréquences de la présence de crête sagittale en fonction du stade de maturation et de la détermination sexuelle a été menée chez les populations de grands singes actuels ( Gorilla , Pan , Pongo ). La présence de crête sagittale n'est pas liée à l'attribution sexuelle mais au stade de développement post-natal de l'individu.

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