Class Reptilia Linnaeus, 1758 - reptiles
   Subclass Lepidosauria Duméril & Bibron, 1839
     Order †Eosuchia Broom, 1914 see Clade Eosuchia Broom 1914 [Laurin 1991]
       Suborder †Champsosaurida
         1 Family †Champsosauridae Cope, 1884
         2 Family †Pachystropheidae Kuhn, 1961