Phylum [Vertebrata] (Lamarck, 1801)
   Class Reptilia Linnaeus, 1758 - reptiles
     Subclass Testudinata Oppel, 1811 - testudinates
       Order Chelonia Brongniart, 1800 see Class Chelonia Brongniart, 1800
         Suborder Cryptodira Cope, 1868
           Family †Protostegidae Cope, 1873
             Genus †Archelon Wieland, 1896