Phylum [Vertebrata] (Lamarck, 1801)
Count: -
   Class Reptilia Linnaeus, 1758 - reptiles
  Count: 4o6f1g; †20o115f227g
     Subclass Diapsida Osborn, 1903 - diapsids see Clade Diapsida Osborn 1903 [Gauthier & de Queiroz 2020]
    Count: -
       Order †Thalattosauria (Merriam, 1905)
      Count: [*] †1f1g
         Family †Thalattosauridae Merriam, 1904
        Count: [*] †1g
           Genus †Thalattosaurus Merriam, 1904
          Count: -