Controversy exists over whether Trogidae is a family of its own or a subfamily of Scarabaeidae. One major reason for the dispute between classifications is the possible evolution of the ommatidium in the eyes. Different environmental pressures and predators may have led to the adaptation of ommatidium structures within this family. For example, the more advanced and numerous the ommatidium, the more present the larger the ability of the insect to escape and elude predators. The Trogidae may have evolved in Australia.