Phylum [Vertebrata] (Lamarck, 1801) Class Reptilia Linnaeus, 1758 - reptiles Subclass Anapsida Osborn, 1903 - anapsids Order †Mesosauria Seeley, 1892 Family †Mesosauridae Baur, 1889 - mesosaurs Genus †Mesosaurus Gervais, 1865