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A parasitic Apocephalus phorid fly attempts to lay her egg (note the long, snaking ovipositor) while her Acromyrmex leafcutter victim struggles to pin the attacker against her defensive spines. Monte Verde, Minas Gerais, Brazil
A mating flight of Crematogaster cerasi acrobat ants provides a parasitic Pseudacteon fly (at lower right) an opportunity to attack. Urbana, Illinois, USA
A mating flight of Crematogaster cerasi acrobat ants provides a parasitic Pseudacteon fly (at lower right) an opportunity to attack. Urbana, Illinois, USA
An Ant-Decapitating Fly (Phoridae, Pseudacteon sp.) attempts to separate a fire ant (Solenopsis macdonaghi) from her nestmates. Lone ants make easier targets. Parque Nacional El Palmar, Entre Rios, Argentina
Solenopsis macdonaghi fire ants attacked by a Pseudacteon ant-decapitating fly. Parque Nacional El Palmar, Entre Rios, Argentina
One of the defenses fire ants (Solenopsis sp.) employ against parasitic phorid flies (Pseudacteon sp.) is to hide. It is thought that the effectiveness of the flies in controlling pest fire ant populations is due more to disruption of the ants' normal foraging behavior than to the parasitism itself. Parque Nacional El Palmar, Entre Rios, Argentina
A trio of parasitic phorid flies (Pseudacteon lontrae) hover over an ant nest (Linepithema oblongum) looking for targets. Termas de Reyes, Jujuy, Argentina
An Ant-Decapitating Fly (Phoridae, Pseudacteon sp.) attempts to oviposit on a fire ant (Solenopsis macdonaghi). Parque Nacional El Palmar, Entre Rios, Argentina
An Ant-Decapitating Fly (Phoridae, Pseudacteon sp.) attempts to separate a fire ant (Solenopsis macdonaghi) from her nestmates. Lone ants make easier targets. Parque Nacional El Palmar, Argentina
A mating flight of Crematogaster cerasi acrobat ants provides a parasitic Pseudacteon fly (at lower right) an opportunity to attack.

Urbana, Illinois, USA
A mating flight of Crematogaster cerasi acrobat ants provides a parasitic Pseudacteon fly (at lower right) an opportunity to attack. Urbana, Illinois, USA
A mating flight of Crematogaster cerasi acrobat ants provides a parasitic Pseudacteon fly (at lower right) an opportunity to attack.

Urbana, Illinois, USA
See photo in original gallery.
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all images and text © Alex Wild 2001-2013