Kingdom [Animalia] Linnaeus, 1758 - animals
   Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997, nom. cl. inval. - ecdysozoans see Clade Ecdysozoa Aguinaldo, Turbeville, Linford, Rivera, Garey, Raff & Lake 1997 [Lake, Halanych, Servin & Garey 2020]
     Panarthropoda Nielsen, 1995 - panarthropods
       Tritocerebra see [unranked] Tactopoda Budd, 2001
         Phylum Arthropoda Siebold, 1848 - arthropods
           Subphylum Mandibulata Snodgrass, 1938
             Infraphylum Crustaceomorpha Chernyshev, 1960 see [unranked] Crustaceomorpha Chernyshev, 1960
               Superclass Crustacea Pennant, 1777 - crustaceans see [unranked] Crustaceomorpha Chernyshev, 1960
                 Epiclass Eucrustacea Kingsley, 1894 see Subphylum Pancrustacea Zrzavý et al., 1997
                   Class Maxillopoda Dahl, 1956 see Subphylum Pancrustacea Zrzavý et al., 1997
                     1 Subclass Thecostraca Gruvel, 1905 - barnacles
                     2 Subclass †Ascothoracida Lacaze-Duthiers, 1880 see Infraclass Ascothoracida Lacaze-Duthiers, 1880
                     3 Subclass †Orstenocarida Müller & Walossek, 1988 see Order Orstenocarida Müller & Walossek, 1988
                     4 Subclass Tantulocarida Boxshall & Lincoln, 1983 - tantulocarids
                     5 Subclass Branchiura Thorell, 1864 - fish lice
                     6 Subclass Pentastomida Diesing, 1836 - tongue worms
                     7 Subclass †Skaracarida (K.J. Müller & Walossek, 1985)
                     8 Subclass Mystacocarida Pennak & Zinn, 1943 - mystacocarids
                     9 Subclass Copepoda H. Milne-Edwards, 1840 - copepods