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 †Redlichiida Richter, 1932
           Suborder †Olenellina Walcott, 1890 [paraphyletic]
             Superfamily †Olenelloidea Walcott, 1890
               1 Family †Olenellidae Walcott, 1890
               2 Family †Holmiidae Hupé, 1953