Fire Ant Castes, Sexes and Life Stages (IMAGE) Georgia Institute of Technology Caption A new study shows that genes involved in creating developmental differences in fire ants evolved more rapidly than genes not involved in these processes. Shown here are fire ants of different castes, sexes and life stages: (top-bottom) worker, male and queen fire ants; (left-right) adult and pupal fire ants. Credit Georgia Tech/Eric A. Hoffman and Michael A. D. Goodisman Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.