Invertebrates
Jack Jumper Ant
Myrmecia pilosula · also called jumper ant
At the edge of a Tasmanian bushland track, a jack jumper ant worker rears up on its long legs and leaps forward at a passing walker, jaws open.
Overview
The jack jumper ant, Myrmecia pilosula, is a Not Evaluated Australian bull ant of forests and grassland in southeastern Australia, including Tasmania. Its leaping attacks, allergenic sting, and record-low chromosome number make it one of the most remarkable ants in the world.
An ant with a single chromosome
Males of the jack jumper have just one chromosome in each cell and females two, which is fewer than in any other known animal.
Status
Not Evaluated globally, though widespread and locally common.
Jack Jumper Ant: common questions
Why is it called the jack jumper ant?
It is named for its habit of leaping forward at intruders, an unusual behaviour among ants.
Is the jack jumper ant dangerous?
Its venom can cause severe allergic reactions in sensitive people, and it is a leading cause of ant-sting allergy in Tasmania.
What is special about its chromosomes?
Males have a single chromosome and females two, the lowest chromosome number known in any animal.
Where is the jack jumper ant found?
It lives in forests and grassland in southeastern Australia, including Tasmania.