†Procolophonia Seeley 1888 [Laurin & Reisz 1995] †Procolophonoidea Romer 1956 [Lee 1995] see Superfamily Procolophonoidea Cope, 1889 †Procolophonidae Lydekker 1889 [Laurin & Reisz 1995] see Family Procolophonidae Lydekker, 1889 Genus †Procolophon Owen, 1876 1 †Procolophon trigoniceps Owen, 1876