Procoptodon goliah, the largest macropodid known to have existed, was a sthenurine kangaroo, but sthenurines occurred in a range of sizes, with Procoptodon gilli being the smallest at the size of a small wallaby.
Procoptodon goliah, a large macropodid, was a member of the sthenurine kangaroo family, which encompasses a range of sizes, including Procoptodon gilli, the smallest species, comparable to a small wallaby.