After Rubidge & Sidor, 2002, Rubidge & Kitching, 2003, Sidor, 2003, Sidor, Hopson & Keyser, 2004, and Rubidge, Sidor & Modesto, 2006

<==o †Biarmosuchia Sigogneau-Russell, 1989 [non? Hopson & Barghusen, 1986] [Rubidginia Huene, 1956; Rubidginoidea Haughton & Brink, 1954]
   |?- †Gorgodon minutus Olson, 1962 [a eotitanosuchian? (The Paleobiology Database)]
   |?- †Knoxosaurus Olson, 1962 [a eotitanosuchian? (The Paleobiology Database)]
   |?- †Steppesaurus Olson & Beerbower, 1953 [a eotitanosuchian? (The Paleobiology Database)]
   |?- †Watongia Olson, 1974 [a varanodontine varanopseid? (The Paleobiology Database)]
   |?-o †Microuraniidae Ivachnenko, 1996
   |  `--o †Microurania Ivakhnenko, 1996
   |     |-- †M. minima Ivakhnenko, 1996
   |     `-- †M. mikia Ivakhnenko, 2003
   |?-o †Niaftasuchidae Ivakhnenko, 1990
   |  `-- †Niaftasuchus zekkeli Ivakhnenko, 1990
   |?-o †Phthinosuchia Romer, 1961
   |  `--o †Phthinosuchidae Efremov, 1954 [incl. Phthinosauridae]
   |     |-- †Phthinosuchus discors Efremov, 1954 [= Rhopalodon pp. Seeley, 1894, Watson, 1921 and 1942, Nopsca, 1928]
   |     `-- †Phthinosaurus borissiaki Efremov, 1940
   |--o †Biarmosuchidae Olsen, 1962
   |  `--o †Biarmosuchus Tchudinov, 1960 [Biarmosaurus Chudinov, 1960]
   |     |-- †B. tener Tchudinov, 1960 [Biarmosaurus antecessor Tchudinov, 1960; Biarmosuchus antecessor (Tchudinov, 1960); ?Eotitanosuchus olsoni Tchudinov, 1960; ?Ivantosaurus ensifer Tchudinov, 1983]
   |     |-- †B. tagax Ivakhnenko, 1990
   |     `-- †B. chudinovi Ivakhnenko, 1999 [Biarmosuchus tchudinovi Ivakhnenko, 1999]
   `--+--o †Hipposauridae
      |  |?- †Pseudhipposaurus kitchingi Boonstra, 1952
      |  `--o †Hipposaurus Haughton, 1929
      |     |-- †H. boonstrai Haughton, 1929
      |     `-- †H. major Boonstra, 1952
      `?=o †“Ictidorhinidae” [paraphyletic]
         |?- †Rubidgina Broom, 1942
         |-- †Ictidorhinidae genera et species indet. [CGP 1/67]
         |-- †Lycaenodon longiceps Broom, 1925 [Hipposaurus rubidgei Broom, 1940; Hipposauroides (Hipposaurus) rubidgei (Broom) Boonstra, 1952]
         `--+-- †Ictidorhinus martinsi Broom, 1913
            `--o †Burnetiamorpha Broom, 1923 sensu Rubidge & Kitching, 2003
               |-- †Lemurosaurus pricei Broom, 1949
               `--+-- †Lobalopex mordax Sidor, Hopson & Keyser, 2004 [CGP 1/61]
                  `--o †Burnetiidae Broom, 1923 sensu Sidor, 2003
                     |?- †Burnetiidae gen. et sp. indet. [Mal 290] [Jacobs, Winkler, Newman, Gomani & Deino, 2005]
                     |--+-- †Paraburnetia sneeubergensis Smith, Rubidge & Sidor, 2006
                     |  `-- †Proburnetia viatkensis Tatarinov, 1968a
                     `--o †Burnetiidae Broom, 1923 sensu Rubidge & Sidor, 2002
                        |?- †Styracocephalus Haughton, 1929 [treated as Tapinocephalian by Carroll (1988)]
                        |-- †Niuksenitia sukhonense Tatarinov, 1977 [non Ivachnenko et al., 1997]
                        |-- †Burnetia mirabilis Broom, 1923 [generic name also used for a bacteria (Dols, pers. comm.).]
                        `--+-- †Pachydectes elsi Rubidge, Sidor & Modesto, 2006
                           `-- †Bullacephalus jacksoni Rubidge & Kitching, 2003

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