After Carroll, 1988, Yates & Warren, 2000 and Milner, 2003

<==o †Dissorophidae Boulenger, 1902 [paraphyletic?]
   |?- †Alegeinosaurus
   |?- †Arkanserpeton
   |?- †Astreptorhachis
   |?- †Brevidorsum
   |?- †Ecolsonia cutlerensis Vaughn, 1969 [possibly basal trematopsids (Milner, 2003)]
   |?- †Fayella
   |?- †Iratusaurus vorax Gubin, 1980
   |?-o †Mordex [taxonomic history] [possibly basal trematopsids (Milner, 2003)]
   |  |-- †M. calliprepes (Carroll, 1964a) [taxonomic history]
   |  `-- †M. laticeps (Fritsch, 1881) Milner & Sequeira, 2003 [taxonomic history]
   |?- †Platyhystrix rugosus Berman et al., 1981
   |?- †Zygosaurus lucius Eichwald, 1848
   |--o Aspidosaurinae DaMar, 1966 [Cacopinae sensu Schoch & Rubidge, 2005]
   |  |-- †Aspidosaurus chiton Case, 1911
   |  |-- †Kamacops acervalis Gubin, 1980
   |  `--o †Cacops [Trematopsis Olson, 1956]
   |     `-- †C. aspidephorus
   `--o Dissorophinae Boulenger, 1902
      |-- †Broiliellus texensis
      |-- †Conjunctio
      `-- †Dissorophus multicinctus Cope, 1895 [taxonomic history]

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