Phylum Arthropoda Siebold, 1848 - arthropods
   Subphylum Crustacea Brünnich, 1772 - crustaceans see Superclass Crustacea Pennant, 1777
     Class Maxillopoda Dahl, 1956 see Subphylum Pancrustacea Zrzavý et al., 1997
       Subclass Pentastomida Diesing, 1836 - tongue worms
         Order Cephalobaenida Heymons, 1935
           1 Family Cephalobaenidae Fain, 1961
           2 Family Reighardiidae Heymons, 1935