''Rhizophascolonus'' is an extinct genus of
diprotodont known from the Early Miocene of South Australia.
[Additional specimens of the oldest wombat, ''Rhizophascolonus crowcrofti'' (Vombatidae; Marsupialia) from the Wipajiri Formation, South Australia: an intermediate morphology? J. Vert. Paleo. 28: 1144]
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The genus was first described to accommodate a new fossil species of Vombatidae, ''Rhizophascolonus crowcrofti'', in 1967. A discovery at Riversleigh was published as another new species in 2018, ''Rhizophascolonus ngangaba'', and further specimens from this area were assigned to ''R. crowcrofti'' in the same study.
References
Prehistoric vombatiforms
Prehistoric marsupial genera
Miocene marsupials
Miocene mammals of Australia
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