Labyrinthodont" is an informal grouping of predatory amphibians which were major components of ecosystems in the late Paleozoic and early Mesozoic eras (about 390 to 150 million years ago). Traditionally considered a subclass of the class Amphibia, modern classification systems recognize that labyrinthodonts are not a formal natural group (clade) exclusive of other tetrapods. Instead, they consistute an evolutionary grade (a paraphyletic group), ancestral to living tetrapods such as lissamphibians (modern amphibians) and amniotes (reptiles, mammals, and kin). "Labyrinthodont"-grade vertebrates evolved from lobe-finned fishes in the Devonian, though a formal boundary between fish and amphibian is difficult to define at this point in time.
Ka-Zar of Prehistoria[]
Labyrinthdonts are called Sithics by the primitive humans of the prehistoric world of Prehistoria. These primitive amphibians mostly roam the swamps and bayous of Pellucidar in the south-eastern region of Prehistoria where they hunt animals such as Eohippus and small dinosaurs. They are sometimes food for larger predators like Deinosuchus.