Archerus is a genus of extinct marsupials from Miocene Australia. It is known from jawbones and partial skulls from the Riversleigh World Heritage Area in Queensland, dated to between . These are sufficient to identify it as a phalangerid, perhaps more closely related to the brushtail possums than to the cuscuses, but with many distinctive skeletal features that make the latter relationship uncertain; it may have lived before the two branches of the living family diverged from one another. It is estimated to have weighed around, similar to the living scaly-tailed possum, and the shape of its teeth suggest that it had a similarly omnivorous diet.[1]