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 †Aulacopleurida Adrain, 2011
           01 Family †Alokistocaridae Resser, 1939
           02 Family †Aulacopleuridae Angelin, 1854
           03 Family †Bathyuridae Walcott, 1886
           04 Family †Brachymetopidae Prantl & Přibyl, 1951
           05 Family †Crepicephalidae Kobayashi, 1935
           06 Family †Dimeropygidae Hupé, 1953
           07 Family †Ehmaniellidae Sundberg, 1994
           08 Family †Holotrachelidae Warburg, 1925
           09 Family †Hystricuridae Hupé, 1953
           10 Family †Marjumiidae Kobayashi, 1935
           11 Family †Rorringtoniidae Owens, 1990
           12 Family †Scharyiidae Osmólska, 1957
           13 Family †Solenopleuridae Angelin, 1854
           14 Family †Telephinidae Marek, 1952
           15 Family †Tricrepicephalidae Palmer, 1955