Class Reptilia Linnaeus, 1758 - reptiles
   Subclass Lepidosauria Duméril & Bibron, 1839
     Order †Eosuchia Broom, 1914 see Clade Eosuchia Broom 1914 [Laurin 1991]
       Suborder †Protorosaurida
         1 Family †Younginidae Broom, 1914
         2 Family †Tanystropheidae Gervais, 1859
         3 Family †Protorosauridae Cope, 1871