Vertebrata Cuvier, 1812 - vertebrates
   Gnathostomata
     Class †Placodermi McCoy, 1848
       1 Order †Stensioellida Romer, 1945 [monotypic] see Order Stensioelliformes
       2 Order †Pseudopetalichthyda [monotypic] see Order Pseudopetalichthyiformes
       3 Order †Rhenanida Broili, 1930 [monotypic] see Order Rhenaniformes
       4 Order †Ptyctodontida Gross, 1932 [monotypic] see Order Ptyctodontiformes
       5 Order †Acanthothoraci Stensiö, 1944 see Order Acanthothoraciformes
       6 Order †Petalichthyida Jaekel, 1911 [monotypic] see Order Petalichthyiformes
       7 Order †Phyllolepida Stensiö, 1934 see Suborder Phyllolepidoidei
       8 Order †Arthrodira Woodward, 1891 see Order Arthrodiriformes Grande & Eastman, 1986
       9 Order †Antiarchi Cope, 1885 see Order Antiarchiformes Grande & Eastman, 1986