Australasia is a general geographical region, but it is not a continent. It is part of the larger region known as Oceania (which is also not a continent).
Australasia encompasses the continent of Australia, together with the country of New Zealand. Some will define it as also including the island of New Guinea, but because it is not a specific area, New Guinea and neighbouring islands are not always included.
Australasian snapper was created in 1801.
Australasian Post was created in 1864.
Australasian Post ended in 2002.
That is the correct spelling "Australasian" referring to a region or the tectonic plate.
The population of Lion - Australasian company - is 8,000.
Lion - Australasian company - was created in 1923.
Australasian Plant Pathology was created in 1972.
Australasian Seabird Group was created in 1971.
Association of Australasian Palaeontologists was created in 1974.
Australasian Raptor Association was created in 1978.
Australasian Ornithological Conference was created in 2001.
Australasian Journal of Philosophy was created in 1923.