[2] Eldredgeops rana can be recognized by its large eyes (which remind some observers of a frog's eyes—the specific name rana is a reference to a common frog), its fairly large size (up to 6 inches long), and its habit of rolling up into a ball like a pill bug ("volvation").

The slightest amount of sediment would trigger their senses, and Eldredgeops rana would be hidden in a tiny shelter made of its own body.

[citation needed] Although this safety feature often helped them to evade predators, occasionally it backfired and the trilobite would be buried under heavy sediment.

Eldredgeops rana is found in the northeastern U.S, southwestern Ontario, and in Morocco; North America was attached to the African Plate during the Devonian.

The eyes were mounted on turret-like structures which could swivel, providing the animal with an almost 360-degree field of view.