The ant is medium-sized in comparison to other Myrmecia species, where workers are typically 12 to 14 millimetres (0.47 to 0.55 in) long.[8] Excluding mandibles, jack jumpers measure 10 millimetres (0.39 in) in length.[33] The ant's antennae, tibiae, tarsi and mandibles are also yellow or orange.[8] Pubescence (hair) on the ant is greyish, short and erect, and is longer and more abundant on their gaster, absent on their antennae, and short and suberect on their legs.[8] The pubescence on the male is grey and long, and abundant throughout the ant's body, but it shortens on the legs.[8] The mandibles are long and slender (measuring 4.2 millimetres (0.17 in)), and concaves around the outer border.[33]