Megalomyrmex symmetochus (attine parasite) in Trachymyrmex nest
The neotropical ant genus Megalomyrmex contains several species that are social parasites inside the nests of fungus-growing ants. Megalomyrmex symmetochus (the two ants at left and bottom) is an obligate parasite of Trachymyrmex. The small colonies of the parasite live inside the fungus garden of the host, feeding on the garden itself and on the Trachymyrmex brood.
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This image was captured with a Canon EOS 20D, using a Canon 65/2.8 MPE 1-5x Macro lens.