Decapitating-fly
Guides
Pseudacteon
Ant-Decapitating Flies
Pseudacteon is a genus of phorid flies comprising over 70 described species, commonly known as ant-decapitating flies. These parasitoids are specialized on ants, particularly Solenopsis fire ants, with females injecting eggs directly into host workers. The larval development occurs entirely within the ant's head capsule, culminating in decapitation and pupation inside the detached head. Several species have been introduced to the United States as biological control agents against invasive red imported fire ants.
Pseudacteon curvatus
fire ant decapitating fly, little decapitating fly
Pseudacteon curvatus is a small phorid fly parasitoid known as the 'little decapitating fly' due to its life cycle in which mature larvae cause decapitation of host fire ants upon emergence. Native to South America, it has been introduced to the United States as a classical biological control agent against invasive imported fire ants (Solenopsis invicta and S. richteri). The species exhibits host specificity toward Solenopsis fire ants and has been the subject of extensive research on laboratory rearing methods, host preference behavior, and field establishment following releases.
Pseudacteon tricuspis
fire ant decapitating fly, phorid fly
Pseudacteon tricuspis is a parasitoid phorid fly that specifically targets the red imported fire ant (Solenopsis invicta). Adult females deposit eggs directly into worker ants, and the developing larvae eventually decapitate the host. The species was introduced to the United States in the late 1990s as a biological control agent against this invasive ant. Native to South America, it has now established populations across the southeastern United States.