Believed to have been accidently introduced from South Africa together with the weed it's larva feed on, Bathurst Burr (which is strangely uncommon in Woodlands Historic Park).
Classification
from Australian Faunal Directory
Order Diptera - Flies, 8955 named species in Australia at Nov. 2021
Division Cyclorrhapha - Flies having Short Antennae with a Bristle or Arista
Family Tephritidae - Fruit Flies, 293 named species in Australia
Genus Euaresta
Species Euaresta bullans