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Breaking the abdomen of a parasitized Odontomachus haematodus trap-jaw ant reveals a mermithid nematode coiled within. Worms infect the ants as larvae and result in stunted adults. Armenia, Belize
An inchworm (Geometridae) bears the burden of parasitic wasps (Braconidae: Microgastrinae) that have consumed its tissues and are pupating on its back. Urbana, Illinois, USA
Dorymyrmex reginicula (at left), a socially parasitic species, is harassed by a worker of its host Dorymyrmex elegans. Workers of the two species coexist in a single nest for a period after the parasite queen has assumed reproduction and before the last remaining host workers die off. The transition period is not entirely smooth, as evidenced by this aggressive interaction. Archbold Biological Station, Florida, USA
Dorymyrmex reginicula (at left), a socially parasitic species, is harassed by a worker of its host Dorymyrmex elegans. Workers of the two species coexist in a single nest for a period after the parasite queen has assumed reproduction and before the last remaining host workers die off. The transition period is not entirely smooth, as evidenced by this aggressive interaction. Archbold Biological Station, Florida, USA
Dorymyrmex reginicula (at left), a socially parasitic species, is harassed by a worker of its host Dorymyrmex elegans. Workers of the two species coexist in a single nest for a period after the parasite queen has assumed reproduction and before the last remaining host workers die off. The transition period is not entirely smooth, as evidenced by this aggressive interaction. Archbold Biological Station, Florida, USA
Dorymyrmex reginicula (at left), a socially parasitic species, is harassed by a worker of its host Dorymyrmex elegans. Workers of the two species coexist in a single nest for a period after the parasite queen has assumed reproduction and before the last remaining host workers die off. The transition period is not entirely smooth, as evidenced by this aggressive interaction. Archbold Biological Station, Florida, USA
An ant-mugging fly (Milichia patrizii) chases down Crematogaster ants on a South African tree branch. If the fly can catch an ant, she will force the ant to feed her. filename: milichiid4
Encyrtid wasp, Comperia merceti, emerging from a parasitized cockroach egg case. Laboratory colony at the University of Arizona. filename: encyrtid2
Eucharitid wasps (blue insect at right) are specialized parasites of ants. Chiricahua Mountains, Arizona, USA
An inchworm (Geometridae) bears the burden of parasitic wasps (Braconidae: Microgastrinae) that have consumed its tissues and are pupating on its back.

Urbana, Illinois, USA
An inchworm (Geometridae) bears the burden of parasitic wasps (Braconidae: Microgastrinae) that have consumed its tissues and are pupating on its back. Urbana, Illinois, USA
An inchworm (Geometridae) bears the burden of parasitic wasps (Braconidae: Microgastrinae) that have consumed its tissues and are pupating on its back.

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