Formerly a suborder of Stegocephalia; large Carboniferous and Permian amphibians having vertebrae in which some elements remain separate WordNet 3.0 & Open English WordNet

Temnospondyli or temnospondyls is a diverse ancient order of small to giant tetrapods — often considered primitive amphibians — that flourished worldwide during the Carboniferous, Permian and Triassic periods, with fossils being found on every continent. Wikipedia