Jul 26, 2025
#3017 - Desmometopa sp.
A widespread genus of Milichiid, with more than 50 described species.
Milichiids are best known for stealing a meal from larger predatory invertebrates, and two of their common names names reflect that - freeloader fly and jackalfly. Quite often they'll be seen feeding on something the larger predator already has in its jaws, or even exploring the jaws themselves. The predators don't appear to mind, so it's possible they consider it a free cleaning service.
Their larvae feeding on rotting vergetation, ordure, and detris, leading to another common name - filth flies.
Goodale Sanctuary, West Coolup, WA.