Synonyms for Labyrinthodontia (same or very similar meaning)
WordNet sense 1 (extinct amphibians typically resembling heavy-bodied salamanders or crocodiles and having a solid flattened skull and conical teeth; Devonian through Triassic):
Labyrinthodonta, superorder Labyrinthodonta, superorder LabyrinthodontiaFrom the ODE community, based on WordNetadd/edit