A new genus and species of dasyurid is described on the basis of P3, M1–M3and M2–3collected from the middle Pliocene Chinchilla Local Fauna of south-eastern Queensland. Character analysis supports the placement of this new taxon within the dasyurid subfamily Dasyurinae. Derived dasyuromorphian features common toA. chinchillaensisand most dasyurines include: reduction of P3, reduction of stylar cusp B on M1; reduction of metaconids; approximation of stylar cusp B and the metacone on M1; alignment of the postmetacrista on M1with the long axis of the maxilla and an oblique orientation of the hypocristids with respect to the long axis of the teeth. However in most instances,A. chinchillaensisis less specialised than other members of the subfamily for characters considered. One derived dental feature, reduction of the entoconid, may indicate a special relationship with ‘parantechinines’,Dasyuroidesand/orDasycercus. Additionally, the presence of this feature is suggestive of an open woodland/seasonal habitat. Autapomorphic P3morphology compounds difficulties with the phylogenetic placement of this taxon.