Phylum [Vertebrata] (Lamarck, 1801)
Count: -
   Class Chondrichthyes Huxley, 1880 - cartilaginous fishes
  Count: 2o;1g; †4o;10g
     Subclass Elasmobranchii Bonaparte, 1838 - shark-like fishes
    Count: 1o;1g; †4o;8g
       Order †Xenacanthida Glikman, 1964 see Order Xenacanthiformes Berg, 1955
      Count: †1g
         1 Genus †Xenacanthus Beyrich, 1848
        Count: -