This link has an artistic depiction of Pyramios.
Pyramios was a marsupial of the Miocene. The systematic paleontology of it is:
Mammalia Linnaeus 1758
Marsupiala Iliger 1811
Australidelphia Szalay 1982
Diprotodontia Owen 1866
Vombatiformes Burnett 1830
Diprotodontidae Gill 1872
Pyramios Woodburne 1967
Pyramios alcootense Woodburne 1967
Fossil remains of Pyramios alcootense have been found at the Alcoota locale in the Northern Territory of Australia. They include at least two skulls and various postcranial bones. These fossils date to around 8 million years ago, which was during the late Miocene.
Pyramios was an herbivore. Its mouth was shovel-shaped and well suited for scooping up roots and tubers. Pyramios was definitely a giant. It had a length of about 3 m. (9.8 feet) and a height of about 1.5 m. (4.92 feet). The weight of Pyramios is estimated to have been 700 kg. (1102-1543 pounds). Pyramios was comparable in size to its cousin Diprotodon, which is also in the Diprotodontidae family.
Pyramios a member of Vombatiformes. Its closest living relatives are koalas and wombats.
This publication is a reference:
John A. Long, Michael Archer, Timothy Flannery, and Suzanne Hand. Prehistoric Mammals of Australia and New Guinea: One Hundred Million Years of Evolution. 2002. Johns Hopkins University Press.