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 Family †Acastidae Delo, 1935