- The jumper ant, Myrmecia nigrocincta (length 12–17 mm) is a distinctive black and reddish-brown species with yellowish jaws.
- Venom-loaded stinger is in the gaster; stings are very painful.
- Their waist is composed of two segments, with the second one broadly attached to the gaster.
- Characteristic long, thin mandibles.
- Size range 8–30 mm long and a few species even longer.