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 †Diplocaulus Cope, 1877 Genus †Keraterpeton Etheridge, 1866