Original: Udvardy 's Australian realm includes only Australia and Tasmania ; he places Wallacea in the Indomalayan Realm , New Guinea , New Caledonia , and East Melanesia in the Oceanian Realm , and New Zealand in the Antarctic Realm .
Simplified: In the WWF system , The Australasia ecozone includes Australia , Tasmania , the islands of Wallacea , New Guinea , the East Melanesian islands , New Caledonia , and New Zealand .