Vertebrata Cuvier, 1812 - vertebrates Gnathostomata Teleostomi Tetrapoda Hatschek & Cori 1896 [Gauthier, Kluge & Rowe 1988] Class Amphibia Gray, 1825 [paraphyletic] Subclass †Lepospondyli Zittel, 1888 see Superorder Lepospondyli Zittel, 1887 Family †Acherontiscidae Carroll, 1969