So now I'm wondering if our jaw is congruent to the ant's mandibles. Wow.
Functionally, in humans the fork and knife held in hands are congruent to the mandibles in ants, and they also work from left and right. (Edit: and I think mandible and hand come from the same Latin root 'manus': e.g. 'manual' means done by hand. But I know zero etymology and zero entomology!)