Phylum [Vertebrata] (Lamarck, 1801)
   Class Reptilia Linnaeus, 1758 - reptiles
     Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
       01 Family †Claudiosauridae Carroll, 1981, incertae sedis
       02 Order †Nothosauria Baur, 1889 - nothosaurs see Suborder Nothosauria Baur, 1889
       03 Order †Ichthyosauria Blainville, 1835
       04 Order †Araeoscelida see Order Araeoscelidia Williston, 1913
       05 Family †Coelurosauravidae Carroll, 1978, incertae sedis see Family Weigeltisauridae Kuhn, 1939
       06 Order †Choristodera Cope, 1876
       07 Order †Thalattosauria (Merriam, 1905)
       08 Order †Eosuchia Broom, 1914 see Clade Eosuchia Broom 1914 [Laurin 1991]
       09 Superorder Lepidosauria Haeckel, 1866 see Superorder Lepidosauriformes Gauthier, Estes & de Queiroz, 1988
       10 Infraclass Archosauromorpha Huene, 1946 see Clade Archosauromorpha Huene 1946 [Benton 1985], nom. cl. inval.