Order Temnospondyli is a group of extinct amphibians that lived during the Palaeozoic and Mesozoic periods. There are several synonyms for the term Order Temnospondyli, such as Stegocephalia, which is derived from Greek words meaning "roof-headed." Other synonyms include Labyrinthodontia, meaning "maze-toothed," and Microsauria, which means "small lizards." These synonyms reflect different aspects of the Order Temnospondyli's anatomy, such as their unique skull structure, and their small size. The study of this ancient group is important for understanding the evolution of modern amphibians and the early history of terrestrial vertebrates.