11. With the frequent convergent evolution of head shape in labyrinthodonts , this led to form taxa only. 12. A consensus on origin of lissamphibians and relationship between the various labyrinthodonts is not likely to materialise soon. 13. American paleontologist Ermine Cowles Case called it Labyrinthodonta " vera " or " true labyrinthodonts ". 14. The first labyrinthodonts were all large to moderately large animals, and would have suffered considerable problems on land. 15. By the Visean age of mid-Carboniferous times the labyrinthodonts had radiated into at least three main branches. 16. "' Xenobrachyops "'is an extinct genus of labyrinthodont amphibian from the Triassic of Australia. 17. They were described at various times as batrachians, stegocephalians, and labyrinthodonts , although these names are now rarely used. 18. For information on the ancestors of reptiles, traditionally classified as labyrinthodont amphibians, see Reptiliomorpha ( reptile-like tetrapods ). 19. The cranial vault as a distinct unit arose with the fusion of the skull roof and the endocranium on the early Labyrinthodonts . 20. The teeth lack labyrinthodont folding of the enamel, and it skull has a much smaller otic notch then seen in other reptiliomorph amphibians.
