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
     Arthropoda Siebold, 1848 - arthropods see Phylum Arthropoda Siebold, 1848
       Mandibulata see Subphylum Mandibulata Snodgrass, 1938
         "Crustacea" Brünnich, 1772 see [unranked] Crustaceomorpha Chernyshev, 1960
           Ichthyostraca Zrzavý et al., 1997
             1 branchiurans Thorell, 1864 see Subclass Branchiura Thorell, 1864
             2 pentastomids see Subclass Pentastomida Diesing, 1836