The Collaborative International Dictionary of English v.0.48:

australopithecine \australopithecine\ adj.
   1. of or pertaining to the genus Australopithecus.
      [WordNet 1.5]

WordNet (r) 3.0 (2006):

Australopithecus
    n 1: extinct genus of African hominid [syn: genus
         Australopithecus, Australopithecus]