Alkwertatherium is an extinct genus of marsupial of the family Diprotodontidae. Only one species has been described, Alkwertatherium webbi, from the Late Miocene of Northern Territory, Australia. References Heritage Advisory Council. Alcoota Fossil Beds. Heritage Notes 2002. Alkwertatherium webbi Prehistoric vombatiforms Miocene mammals of Australia Miocene marsupials Prehistoric monotypic mammal genera Prehistoric marsupial genera Fossil taxa described in 1990