Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Class †Placodermi McCoy, 1848
       Order †Arthrodira Woodward, 1891 see Order Arthrodiriformes Grande & Eastman, 1986
         01 Suborder †Actinolepina Miles, 1973 see Suborder Actinolepidoidei Miles, 1973
         02 Suborder †Wuttagoonaspina Ritchie, 1973 [monotypic]
         03 Suborder †Phlyctaeniina see Suborder Phlyctaeniida
         04 Suborder †Brachythoraci Gross, 1932
         05 Family †Rachiosteidae Stensiö, 1963
         06 Family †Selenosteidae Dean, 1901
         07 Family †Pachyosteidae Gross, 1932 see Family Selenosteidae Dean, 1901
         08 Family †Mylostomatidae Woodward, 1891
         09 Family †Titanichthyidae Dean, 1901
         10 Family †Bungartiidae Denison, 1975