The Bulldog ants definitely had wasps as ancestors, as Silver said all ants probably did. Myrmecia covers every species of Bulldog ant from the Jack Jumper to the largest Bulldog ants, they all have a stingers and are all ferocious, especially nasty are the smaller Jack Jumpers which also have the most potent venom. Myrmecia ranges in size from 8mm up to about 40mm.