Myrmecia cephalotes  Myrmecia cephalotes is an Australian ant which belongs to the genus "Myrmecia". This species is native to Australia. Myrmecia cephalotes has a large distribution in central South Australia and can be found in other regions of Australia. The length of a worker "Myrmecia cephalotes" is 13-14.5 millimetres long. The head and gaster are black; the antennae, thorax, node, legs and other features on the body are a yellowish-red colour. The mandibles are a yellow colour.