Phylum [Vertebrata] Lamarck, 1801 see Infraphylum Vertebrata Lamarck, 1801
Status: extant
   Class Reptilia Linnaeus, 1758 - reptiles
  Status: extant
     Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
    Status: extant
       Order †Ichthyosauria Blainville, 1835
      Status: fossil
         Family †Ichthyosauridae Bonaparte, 1841
        Status: fossil
           Genus †Ichthyosaurus [König], 1818
          Status: fossil