After Rubidge & Sidor, 2001, (partly) Sidor & Smith, 2004, Martinelli, Bonaparte, Schultz, & Rubert, 2005, and Sidor & Hancox, 2006

    Cynodontia Owen, 1861

        †Dviniidae Tatarinov, 1968

        †Procynosuchidae Broom, 1938

        ?†Madysauridae Tatarinov, 2005

        Epicynodontia Hopson & Kitching, 2001

            †Galesauridae Lydekker, 1890

            †Thrinaxodontidae

            EucynodontiaCynognathiaCynognathidaeTritylodontoideaGomphodontiaTraversodontidae; Flynn et al., 1999

                        †DiademodontidaeTrirachodontidae Romer, 1967

                        †Traversodontidae von Huene, 1936

                        †Tritylodontidae Cope, 1884
                            †Bainotheriidae Young, 1940

                    ProbainognathiaProbainognathidae

                        Chiniquodontoidea Huene, 1936
                            Tritheledontidae; Luo, 1994

                            †Chiniquodontidae v. Huene, 1936
                              including:Dromatheriidae Gill, 1872; Carroll, 1988
                                †Therioherpetidae Bonaparte & Barberena, 1975;Carroll, 1988

                            †Therioherpetidae Bonaparte & Barberena, 1975
                                †Chiniquodontidae v. Huene, 1936; Carroll, 1988

                            Mammaliaformes Rowe, 1988
                                Mammalia; Luo, 1994

                            †Ictidosauria Broom, 1929
                                †Tritheledontidae; Hopson & Kitching, 1972
                                †Tritheledontoidea; Bonaparte, 1980
                                †Tritheledontidae; Martinelli, Bonaparte, Schultz, & Rubert, 2005
                                †Tritheledontidae; Sidor & Hancox, 2006

                                †Riograndidae Bonaparte, Ferigolo & Ribeiro, 2001
                                    †Tritheledontidae; Martinelli, Bonaparte, Schultz, & Rubert, 2005
                                    †Tritheledontidae; Sidor & Hancox, 2006

                                †Tritheledontidae Broom, 1912
                                  including:Ictidosauridae Young, 1947
                                    †Diarthrognathidae Crompton, 1958
                                    †Pachygenelidae Bonaparte, 1980
                                    †Riograndidae Bonaparte, Ferigolo & Ribeiro, 2001; Martinelli, Bonaparte, Schultz, & Rubert, 2005
                                    †Riograndidae Bonaparte, Ferigolo & Ribeiro, 2001; Sidor & Hancox, 2006

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