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The larva of a lady beetle (Harmonia axyridis) makes short work of milkweed aphids (Aphis nerii). 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
Aphidius ervi - biocontrol wasp attacking Acyrthosiphon pisum pea aphids. Laboratory colony at the University of Arizona
Encyrtid wasp, Comperia merceti, emerging from a parasitized cockroach egg case. Laboratory colony at the University of Arizona. filename: encyrtid2
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
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 predatory syrphid fly larva sneaks up behind an oleander aphid (Aphis nerii) for a quick snack. Syrphids are excellent control agents for pest aphids. Arizona. filename: syrphidlarva1
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
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
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
See photo in original gallery.
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all images and text © Alex Wild 2001-2013