After Laurin, Gauthier & Hedges, 1996-1997, Modesto & Smith, 2001, and Müller & Reisz, 2005

<==o †Captorhinidae Case, 1911 [Pariotichidae Cope; 1895; Romeriidae Carroll, 1964 (in partim)]
   |-- †Concordia cunninghami Müller & Reisz, 2005; L.Carb. CNAm.
   |-- †Opisthodontosaurus carrolli Reisz, LeBlanc, Sidor, Scott & May, 2015; E.Perm. CNAm.
   `--+--+-- †Reiszorhinus olsoni Sumida, Dodick, Metcalf & Albright, 2010; E.Perm. CNAm.
      |  `--o †Romeria Price, 1937
      |     |-- †R. texana Price, 1937
      |     `-- †R. prima Clark & Carroll, 1973, emend. Heaton, 1979 [Romeria primus Clark & Carroll, 1973]
      `--+-- †Rhiodenticulaus heatoni Berman & Reisz, 1986
         `--+-- †Protocaptorhinus pricei Clark & Carroll, 1973 [Pleuristion brachycoelous] L.Perm. Af.
            `--+-- †Saurorictus australis Modesto & Smith, R. M. H., 2001; L.Perm. SAf.
               |?- †Acrodenta irerhi Dutuit, 1976 [Acrodonta Jalil & Dutuit, 1996, lapsus calami?]
               |?- †Baeotherates fortsillensis May & Cifelli; 1998
               |?- †Captorhinoides valensis Olson, 1951
               |?- †Peurcosaurus obtusidens Williston, 1916 (nomen dubium?)
               `--+--o †Captorhinus Case, 1911 [Pariotichus; Ectocynodon; Hypopnous; Eocaptorhinus; Bayloria]
                  |  |?- †C. gregoryi
                  |  |?- †C. ordinatus [Ectocynodon]
                  |  |?- †C. zambiensis [same as C. sp. cf. C. aguti [Gow, 2000]??]
                  |  |-- †C. aguti (Cope, 1882) Case, 1911 [Ectocynodon aguti Cope, 1882; Pariotichus aguti Cope, 1895; C. isolomus; C. angusticeps; C. aduncus; Ectocynodon incisivus; Bayloria morei; Hypopnous squaliceps; Paracaptorhinus neglectus]
                  |  |-- †C. laticeps (Williston, 1909) Dodick & Modesto, 1995 [Pariotichus laticeps Williston, 1909; Captorhinus isolomus Case, 1911; Captorhinus aguti Seltin, 1959; Captorhinus aguti Gaffney, 1990; Eocaptorhinus laticeps Heaton, 1979; Captorhinus laticeps Dodick & Modesto, 1995 and Modesto et al., 2007]
                  |  |-- †C. magnus Kissel et al., 2002
                  |  `-- †C. sp. cf. C. aguti [Gow, 2000] [Zambia]
                  `--o †Moradisaurinae de Ricqlès & Taquet, 1982
                     |--+-- †Labidosaurus hamatus (Cope, 1895) Cope, 1896 [Pariotichus hamatus Cope, 1895; L. broilii] [Lepidosaurus??]
                     |  `-- †Labidosaurikos meachami Stovall, 1950 [L. barkeri] E.Perm. NAm.
                     `--+?-o †Captorhinikos Olson, 1954; E.Perm. NAm.
                        |  |-- †C. parvus Olson, 1970
                        |  |-- †C. valensis Olson, 1954 [=? Captorhinoides valensis Olson, 1951]
                        |  `-- †C. chozaensis Olson, 1954
                        |?- †Gecatogomphius kavejevi Vjushkov & Chudinov, 1957 [Hecatogomphius (lapsus calami)] M.Perm. EEu.
                        |?- †Kahneria seltina Olson, 1962; M.Perm. NAm.
                        |-- †Moradisaurus grandis Taquet, 1969; L.Perm. WAf.
                        `--+-- †Gansurhinus qingtoushanensis Reisz, Liu, Li & Müller, 2011; M.Perm. EAs.
                           `--o †Rothianiscus Kuhn, 1961 [Rothia Olson & Beerbower, 1953; Rothaniscus (lapsus calami)] M.Perm. NAm.
                              |-- †R. multidonta (Olson & Beerbower, 1953) [Rothia multidonta Olson & Beerbower, 1953]
                              `-- †R. robusta (Olson, 1965) Ricqlès & Taquet, 1982 [Rothia robusta Olson, 1965]

After Reisz, LeBlanc, Sidor, Scott & May, 2015

<==o †Captorhinidae
   |-- †Concordia
   |-- †Opisthodontosaurus
   `--+-- †Rhiodenticulaus
      `--+--+-- †Reiszorhinus
         |  `-- †Romeria
         `--+-- †Protocaptorhinus
            `--+-- †Saurorictus
               `--+-- †Captorhinus
                  `--+-- †Captorhinikos chozaensis
                     `--+-- †Labidosaurus
                        `--+-- †Captorhinikos valensis
                           `--+-- †Labidosaurikos
                              `--+-- †Moradisaurus
                                 `--+-- †Rothianiscus
                                    `-- †Gansurhinus


Reference(s):

  • Reisz, R. R., LeBlanc, A. R. H., Sidor, C. A., Scott, D. & May, W., 2015: A new captorhinid reptile from the Lower Permian of Oklahoma showing remarkable dental and mandibular convergence with microsaurian tetrapods.
    –The Science of Nature: Vol. 102, #9-10, pp. 1-12 [doi: 10.1007/s00114-015-1299-y]

Reference(s):