After Alifanov, 2000, and Gao & Norell, 2000

<==o †Mongolochamopidae Alifanov, 1993 [Macrocephalosauridae: Mongolochamopinae Alifanov, 1993]
   |-- †Chilingosaurus Young, 1961; U.Cret. EAs.
   |-- †Buckantaus crassidens Nesov, 1985; U.Cret. CAs.
   |-- †Gerontoseps irvinensis Gao & Fox, 1991; U.Cret. NA.
   |--o †Socognathus Gao & Fox, 1991; U.Cret. NA.
   |  |-- †S. brachyodon  Longrich et al., 2013
   |  `-- †S. unicuspis Gao & Fox, 1991
   |-- †Sphenosiagon simplex Gao & Fox, 1991; U.Cret. NA.
   |-- †Mongolochamops reshetovi Alifanov, 1988; U.Cret. EAs.
   |-- †Altanteius facilis (Alifanov, 1988) Alifanov, 1993 [Mongolochamops facilis Alifanov, 1988] U.Cret. EAs.
   |-- †Gobinatus arenosus Alifanov, 1993; U.Cret. EAs.
   |-- †Parameiva oculea Alifanov, 1993; U.Cret. EAs.
   |-- †Prodenteia ministra Alifanov, 1993; U.Cret. EAs.
   |-- †Pyramicephalosaurus cherminicus Alifanov, 1988 emend. Alifanov, 1993b [Piramicephalosaurus cherminicus Alifanov, 1988], U.Cret. EAs.
   |-- †Tchingisaurus multivagus Alifanov, 1993; U.Cret. EAs.
   |-- †Barungoia vasta Alifanov, 1993; U.Cret. EAs.
   |-- †Dzhadochtosaurus giganteus Alifanov, 1993; U.Cret. EAs.
   |--o †Conicodontosaurus Gilmore, 1943; U.Cret. EAs.
   |  |-- †C. djadocbtaensis Gilmore, 1943
   |  |-- †C. kanhsienensis Young, 1973
   |  `?- †C. qinlingensis Li, Xue & Liu, 2004
   `--o †Curvansaurus Alifanov, 1993; U.Cret. EAs.
      |-- †C. canaliculatus Alifanov, 1993
      `-- †C. potissimus Alifanov, 1993

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