The largest worker army ant is 14mm long, slightly more than one-half inch (Eciton dulcium). The most conspicuous large swarm raider, Eciton burchelli, is 11 mm long. The queens and males are approximately twice as long as the largest workers in each species. The smallest workers of Eciton burchelli are __ long. All intermediate sizes are found between the smallest workers and the largest. The biggest workers are called majors or soldiers. The soldiers of all Eciton species except E. rapax have large hook like jaws.
The smallest worker army ant is 0.8 mm long, Neivamyrmex pauxillus. That species has only been found two times since it was first discovered in 19xx.