Myrmecia desertorum is an Australian ant species belonging to the Myrmecia genus. They were first described by Wheeler in 1915, and are distributed all over Australia. Myrmecia desertorum are common nationwide. They are typically 18-26 millimetres long. They are usually a reddish yellow colour. Their heads and gaster are in a blackish brown colour, and mandibles and clypeus are of a yellow colour.