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
             Superfamily †Acastoidea Delo, 1935
               1 Family †Acastidae Delo, 1935
               2 Family †Calmoniidae Delo, 1935