Class [Cephalopoda] Cuvier, 1795 - cephalopods
   Subclass Nautiloidea Agassiz, 1848
     1 Order †Basslerocerida Flower & Kummel, 1950
     2 Order †Tarphycerida Flower & Kummel, 1950
     3 Order †Lituitida
     4 Order †Discosorida Flower, 1950
     5 Order †Oncocerida Flower & Kummel, 1950
     6 Order Nautilida Agassiz, 1848