fossil marine animal genera Linnaeus, 1758 - animals
   Phylum Chordata Bateson, 1885 - chordates
     Chordata Bateson, 1885 - chordates see Phylum Chordata Bateson, 1885
       Class Cephalaspidomorphi Kiaer & Stensiö, 1920 see Class Osteostraci Lankester, 1868
         1 Order †Cephalaspidoformes see Order Cephalaspidiformes Halstead Tarlo, 1967
         2 Order †Atelaspidiformes see Order Cephalaspidiformes Halstead Tarlo, 1967
         3 Order †Birkeniiformes see Order Anaspidiformes
         4 Order †Anaspida Traquair - anaspids see Class Anaspida Traquair
         5 Order Petromyzoniformes see Order Petromyzontiformes Berg, 1940
         6 Order Myxiniformes - hagfishes