Class Reptilia Linnaeus, 1758 - reptiles Subclass †Synapsida Osborn, 1903 - synapsids see Class Synapsida Osborn, 1903 Order †Pelycosauria Cope, 1878 - pelycosaurs Suborder †Edaphosauria Cope, 1882 1 Family †Nitosauridae Romer & Price, 1940 2 Family †Lupeosauridae Romer & Price, 1940 3 Family †Edaphosauridae Cope, 1882 4 Family †Caseidae Williston, 1912