†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
       †Leptopleuroninae Ivakhnenko 1979 [Modesto et al. 2002] see Subfamily Leptopleuroninae Ivakhnenko, 1979
         1 Genus †Tichvinskia Chudinov & V'yushkov, 1956
         2.1 Genus †Scoloparia Sues & Baird, 1998
         2.2.1 Genus †Leptopleuron Owen, 1851
         2.2.2 Genus †Hypsognathus Gilmore, 1928