Hypsiprymnodon moschatus (Ramsey 1876, snout-vent up to 27cm) isthe extant musky rat-kangaroo, restricted to NE Australia. This omnivore is traditionally allied with kangaroos, but in the LRT nests with potoroos, like Potorous. The last premolars converge with those of multituberculates, like Ptilodus (above).

Potorous tridactylus (Kerr 1792; body length: 36cm, taili: 15-24cm) is the extant long-nosed potoroo, a member of the rat-kangaroo family. Nocturnal Potorous hops about while it digs for roots and fungi.

Beck RMD, Voss RS and Jansa SA 2022. Craniodental morphology and phylogeny of marsupials. Bullein of the American Museum of Natural History 457:350pp.

Kerr J 1792. Animal Kingdom: 198.

Ramsay EP 1875. Description of a new genus and species of rat kangaroo, allied to the genus Hypsiprymnus, proposed to be called 'Hypsiprymnodon moschatus'. Proceedings of the Linnean Society of New South Wales. 1: 33–35.

wiki/Musky_rat-kangaroo
wiki/Potorous