Chordata Bateson, 1885 - chordates
   Class †Ostracophori
     Order †Osteostraci - osteostracans see Order Cephalaspidiformes
       14 Family †Cephalaspidae
       15 Family †Ateleaspidae Traquair, 1899 [monotypic]
       16 Family †Thyestidae
       17 Family †Odontodontidae nom. imperf.
       18 Family †Euphaneropidae Woodward, 1900 [monotypic]