Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801 Class Reptilia Linnaeus, 1758 - reptiles Order †Plesiosauria Blainville, 1835, incertae sedis - plesiosaurs Family †Cryptocleididae see Family Cryptoclididae Williston, 1925 1 Genus †Cryptocleidus Seeley, 1892 see Genus Cryptoclidus Seeley, 1892