Kingdom Animalia Linnaeus, 1758 - animals
   Phylum Arthropoda Siebold, 1848 - arthropods
     Subphylum †Trilobitomorpha Størmer, 1944 - trilobites see Superclass Trilobitomorpha Størmer, 1944
       Class †Trilobita Walch, 1771 - trilobites
         Order †Phacopida Salter, 1864
           Suborder †Phacopina Struve, 1959
             1 Superfamily †Acastoidea Delo, 1935
             2 Superfamily †Dalmanitoidea Vogdes, 1890 [monotypic]
             3 Superfamily †Phacopoidea Hawle & Corda, 1847
             4 Family †Diaphanometopidae Jaanusson, 1959, incertae sedis
             5 Family †Prosopiscidae Fortey & Shergold, 1984, incertae sedis