Labyrinthodontia
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A Labyrinthodont (Greek, "maze-toothed") is any member of an extinct suborder (Labyrinthodontia) or subclass of amphibians that constituted the dominant animals of Late Paleozoic and Early Mesozoic times (about 350 to 210 million years ago). Labyrinthodonts first appeared in the Late Devonian (374 to 360 million years ago) and may well have included the ancestors of all land vertebrates. They typically had bodies resembling salamanders or crocodiles. Today Labyrinthodontia is considered to be paraphyletic by most scholars, and thus not a valid taxon.