Trachymyrmex desertorum workers in the fungus garden. Tucson, Arizona, USA

Trachymyrmex pomonae Portal, 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