The Order Diprotodontia is one of the 7 Orders included within the Subclass Marsupiala. Marsupials are united primarily on the basis of a common means of reproduction. All other therian mammals also share a common reproductive method, but they are divided into 19 different orders.

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SUBORDER VOMBATIFORMES
Family Vombatidae

• Common Wombat (Vombatus ursinus)
  

SUBORDER PHALANGERIFORMES
Superfamily Phalangeroidea
Family Phalangeridae
Subfamily Phalangerinae
Tribe Trichosurini

• Common Brushtail (Trichosurus vulpecula)
  

Superfamily Petauroidea
Family Pseudocheiridae
Subfamily Hemibelideinae

• Greater Glider (Petauroides volans)
  

Subfamily Pseudocheirinae

• Common Ringtail (Pseudocheirus peregrinus)
  

Family Petauridae

• Sugar Glider (Petaurus breviceps)
• Squirrel Glider (Petaurus norfolcensis)
  

Family Tarsipedidae

• Honey Possum (Tarsipes rostratus)

SUBORDER MACROPODIFORMES
Family Potoroidae

• Long-nosed Potoroo (Potorous tridactylus)
  

Family Macropodidae
Subfamily Macropodinae

• Tammar Wallaby (Macropus eugenii)
• Western Grey Kangaroo (Macropus fuliginosus)
• Red-necked Wallaby (Macropus rufogriseus)
• Red Kangaroo (Macropus rufus)
• Quokka (Setonix brachyurus)
• Tasmanian Pademelon (Thylogale billardierii)