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Trachymyrmex arizonensis & Pyramica arizonica. The minute Pyramica arizonica (at center) is found only inside nests of another ant species, the fungus-growing ant Trachymyrmex arizonensis. Sycamore Canyon, Arizona, USA
An Adranes ant beetle walks through the brood nest of its host, Lasius pallitarsis. These odd little beetles live in ant nests feeding on the developing brood. Blodgett Forest, California, USA
Larvae of syrphid flies in the genus Microdon are so odd that they were originally described as molluscs. The adults are more or less normal-looking flies, but larvae are predators of ant brood, living within the dark galleries of ant nests (in this case, with Linepithema oblongum). Termas de Reyes, Jujuy, Argentina
Formicoxenus diversipilosus male. This species in unusual in the extent to which males resemble the workers. Sagehen Creek, California, USA
Formicoxenus diversipilosus male. This species in unusual in the extent to which males resemble the workers. Sagehen Creek, California, USA
Stigmacros worker ants with an Anthrenocerus dermestid beetle larva. The beetle is likely a commensal inhabitant of the ant's nest, taking advantage of the ants' climate-controlled colony while feeding on debris around the nest. Yandoit, Victoria, Australia
Stigmacros worker ants with an Anthrenocerus dermestid beetle larva. The beetle is likely a commensal inhabitant of the ant's nest, taking advantage of the ants' climate-controlled colony while feeding on debris around the nest. Yandoit, Victoria, Australia
Stigmacros worker ant with an Anthrenocerus dermestid beetle larva. The beetle is likely a commensal inhabitant of the ant's nest, taking advantage of the ants' climate-controlled colony while feeding on debris around the nest. Yandoit, Victoria, Australia Yandoit, Victoria, Australia
Megalomyrmex adamsae, queen and workers. Panama; captive colony at the University of Texas
Trachymyrmex arizonensis & Pyramica arizonica. The minute Pyramica arizonica (at center) is found only inside nests of another ant species, the fungus-growing ant Trachymyrmex arizonensis.

Sycamore Canyon, Arizona, USA
Trachymyrmex arizonensis & Pyramica arizonica. The minute Pyramica arizonica (at center) is found only inside nests of another ant species, the fungus-growing ant Trachymyrmex arizonensis. Sycamore Canyon, Arizona, USA
Trachymyrmex arizonensis & Pyramica arizonica. The minute Pyramica arizonica (at center) is found only inside nests of another ant species, the fungus-growing ant Trachymyrmex arizonensis.

Sycamore Canyon, Arizona, USA
See photo in original gallery.
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all images and text © Alex Wild 2001-2013