Kingdom [Animalia] Linnaeus, 1758 - animals
   Subkingdom Metazoa Haeckel, 1874 see Kingdom Animalia Linnaeus, 1758
     Division Eumetazoa Butschli, 1910 see Subkingdom Eumetazoa Butschli, 1910
       Subdivision Bilateralia
         Phylum Chordata Bateson, 1885 - chordates
           Subphylum Vertebrata Cuvier, 1812 - vertebrates
             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