|1 Alitrunk (Mesosoma) attached to gaster with one distinct segment, the petiole (figure 1)...couplet 2||1' Alitrunk attached to gaster with two distinct segments, the petiole and postpetiole (figure 2)...couplet 7|
Figure 1. Camponotus castaneus worker with arrow pointing to petiole.
|Figure 2. Myrmica punctiventris
worker with arrows pointing to petiole and post petiole.