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
         01 Order †Eodiscida Kobayashi, 1939
         02 Order †Redlichiida Richter, 1932
         03 Order †Corynexochida Kobayashi, 1935
         04 Order †Lichida Moore, 1959
         05 Order †Odontopleurida Whittington, 1959 [monotypic]
         06 Order †Phacopida Salter, 1864
         07 Order †Proetida Fortey & Owens, 1975
         08 Order †Aulacopleurida Adrain, 2011
         09 Order †Asaphida Salter, 1864
         10 Order †Olenida Adrain, 2011
         11 Order †Harpida Whittington, 1959 [monotypic]
         12 Family †Acrocephalitidae Hupé, 1953, incertae sedis
         13 Family †Aldonaiidae Hupé, 1953, incertae sedis
         14 Family †Amgaspididae Černyševa, 1960, incertae sedis
         15 Family †Anomocarellidae Hupé, 1955, incertae sedis
         16 Family †Anomocaridae Poulsen, 1927, incertae sedis
         17 Family †Antagmidae Hupé, 1953, incertae sedis
         18 Family †Atopidae Hupé, 1953, incertae sedis
         19 Family †Auritamidae Öpik, 1967, incertae sedis
         20 Family †Avoninidae Lochman, 1936, incertae sedis
         21 Family †Bolaspididae Howell, 1959, incertae sedis
         22 Family †Catillicephalidae Raymond, 1938, incertae sedis
         23 Family †Changshaniidae Kobayashi, 1935, incertae sedis
         24 Family †Cheilocephalidae Shaw, 1956, incertae sedis
         25 Family †Conocoryphidae Angelin, 1854, incertae sedis
         26 Family †Damesellidae Kobayashi, 1935, incertae sedis
         27 Family †Diceratocephalidae Lu, 1954, incertae sedis
         28 Family †Dikelocephalidae Miller, 1889, incertae sedis
         29 Family †Ellipsocephaloididae Hupé, 1955, incertae sedis
         30 Family †Elviniidae Kobayashi, 1935, incertae sedis
         31 Family †Eurekiidae Hupé, 1953, incertae sedis
         32 Family †Harpididae Whittington, 1950, incertae sedis
         33 Family †Holocephalinidae Hupé, 1953, incertae sedis
         34 Family †Hungaiidae Raymond, 1924, incertae sedis
         35 Family †Ignotogregatidae Zhang & Jell, 1987, incertae sedis
         36 Family †Inouyiidae Zhang, 1963, incertae sedis
         37 Family †Isocolidae Angelin, 1854, incertae sedis
         38 Family †Ityophoridae Warburg, 1925, incertae sedis
         39 Family †Jamrogiidae Bentley, Jago & Cooper, 2009, incertae sedis
         40 Family †Kingstoniidae Kobayashi, 1933, incertae sedis
         41 Family †Lisaniidae Zhang, 1963, incertae sedis
         42 Family †Llanoaspididae Lochman, 1944, incertae sedis
         43 Family †Lonchocephalidae Hupé, 1953, incertae sedis
         44 Family †Lorenzellidae Zhang, 1963, incertae sedis
         45 Family †Mapaniidae Zhang, 1963, incertae sedis
         46 Family †Menomoniidae Walcott, 1916, incertae sedis
         47 Family †Missisquoiidae Hupé, 1953, incertae sedis
         48 Family †Monkaspididae Kobayashi, 1935, incertae sedis
         49 Family †Namanoiidae Lermontova, 1951, incertae sedis
         50 Family †Nepeidae Whitehouse, 1939, incertae sedis
         51 Family †Norwoodiidae Walcott, 1916, incertae sedis
         52 Family †Onchonotopsidae Shaw, 1966, incertae sedis
         53 Family †Papyriaspididae Whitehouse, 1939, incertae sedis
         54 Family †Phylacteridae Ludvigsen & Westrop, 1989, incertae sedis
         55 Family †Plethopeltidae Raymond, 1925, incertae sedis
         56 Family †Polycyrtaspididae Öpik, 1967, incertae sedis
         57 Family †Proasaphiscidae Zhang, 1963, incertae sedis
         58 Family †Ptychaspididae Raymond, 1924, incertae sedis
         59 Family †Ptychopariidae Matthew, 1887, incertae sedis [polyphyletic]
         60 Family †Raymondinidae Clark, 1924, incertae sedis
         61 Family †Rhyssometopidae Öpik, 1967, incertae sedis
         62 Family †Sarkiidae Hupé, 1953, incertae sedis
         63 Family †Shirakiellidae Hupé, 1953, incertae sedis
         64 Family †Shumardiidae Lake, 1907, incertae sedis
         65 Family †Sunaspididae Zhang & Jell, 1987, incertae sedis
         66 Family †Utiidae Kobayashi, 1935, incertae sedis
         67 Family †Wuaniidae Zhang & Yuan, 1981, incertae sedis