Phylum [Vertebrata] (Lamarck, 1801) Class Amphibia Linnaeus, 1758 - amphibians see Class Amphibia Gray, 1825 Subclass †Lepospondyli Zittel, 1888 see Superorder Lepospondyli Zittel, 1887 Order †Nectridea Miall, 1875 Family †Keraterpetontidae Jaekel, 1903 Genus †Keraterpeton Etheridge, 1866