Class [Cephalopoda] Cuvier, 1795 - cephalopods
Count: 1o; †16o
   Subclass †Ellesmeroceratoidea
  Count: [†o] †4o
     1 Order †Plectronocerida
    Count: -
     2 Order †Protactinocerida
    Count: -
     3 Order †Yanhecerida
    Count: -
     4 Order †Ellesmerocerida Flower & Kummel, 1950
    Count: -