The flies in this subgenre are found mainly in New Zealand, with a few in Australia.

[1] They are the only Simuliidae found in New Zealand.

[2] In New Zealand, where they are known as sandflies, the females of three species – A. australense, A. tillyardianum and A. ungulatum – bite humans;[3][4] the males do not.

[6] A. ungulatum is found in the South Island and Stewart Island, and is well-known for biting humans.

[7][8] These 24 species belong to the subgenus Austrosimulium:[9][2] This article related to members of the fly superfamily Chironomoidea is a stub.