Most bushwalking Australians have encountered this ant.
Those who have had previous dealings with it tend keep their distance.
Of the genus Myrmecia, there are over 90 species ( and counting) of this insect.
The sting is painful and is a follow up to being grabbed by legs and those fearsome jaws.
Other than the Water Bug, one of my most cautious macros to date.
More information on bull ants can be found here.