Mention army ants, and one immediately thinks of the legendary Eciton or Labidus roaming around the forest floors in the New World. Army ants are found even in the Old World, and one of the most common ones are Cerapachys. These ants hunt either individually or in small groups in loose columns. They are thought to be specialist predators of other ants.
In the context of visual system, Cerapachys ants present an interesting case. While some species have compound eyes and three simple eyes called ocelli, others are completely blind. Why is that so and how does it reflect on their individual foraging capacities?
More pictures here.