Key to South American species of Australonura

1 Chaetae smooth or very sparsely serrated................................................................. 2

- Chaetae ciliated................................................................... A. paraguayensis sp. nov.

2 Di tubercle on Abd. V with one chaeta, Ocp absent on ocular tubercle........... A. friasica (Cassagnau & Oliveira, 1990)

- Di tubercle on Abd. V with two chaetae................................................................... 3

3 Ocp present on ocular tubercle....................................... A. limnophila (Cassagnau & Rapoport, 1962)

- Ocp absent on ocular tubercle........................................................................ A. sp.