The red imported fire ant worker, Solenopsis invicta, can be identified by its 10-segmented antennae with two segment club and its waist, consisting of two segments with two visible nodes.

Red imported fire ant worker showing two key characters of all fire ants: 10-segmented antennae with two segment club, and waist consisting of two segments with two visible nodes. Credit: John N. Kabashima
Credit: John N. Kabashima