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 Copepoda H. Milne-Edwards, 1840 - copepods
         Infraclass Neocopepoda Huys & Boxshall, 1991
           Superorder Podoplea Giesbrecht, 1882
             Order Harpacticoida Sars, 1903
               01 Family Adenopleurellidae Huys, 1990
               02 Family Aegisthidae W. Giesbrecht, 1892
               03 Family Ambunguipedidae R. Huys, 1990 see Family Rhynchothalestridae Lang, 1948
               04 Family Ameiridae Monard, 1927
               05 Family Ancorabolidae G.O. Sars, 1909
               06 Family Argestidae Por, 1986
               07 Family Balaenophilidae G.O. Sars, 1910
               08 Family Cancrincolidae Fiers, 1990
               09 Family Canthocamptidae G.O. Sars, 1906
               10 Family Canuellidae K. Lang, 1944
               11 Family Cerviniidae G.O. Sars, 1903 see Family Aegisthidae W. Giesbrecht, 1892
               12 Family Chappuisiidae Chappuis, 1940
               13 Family Cletodidae T. Scott, 1905
               14 Family Cletopsyllidae Huys & Willems, 1989
               15 Family Clytemnestridae A. Scott, 1909
               16 Family Cristacoxidae Huys, 1990
               17 Family Cylindropsyllidae G.O. Sars, 1909
               18 Family Darcythompsoniidae Lang, 1936
               19 Family Diosaccidae G.O. Sars, 1906 see Family Miraciidae Dana, 1846
               20 Family Ectinosomatidae G.O. Sars, 1903
               21 Family Euterpinidae Brian, 1921
               22 Family Hamondiidae R. Huys, 1990 see Family Rhynchothalestridae Lang, 1948
               23 Family Harpacticidae Dana, 1846
               24 Family Huntemanniidae Por, 1986
               25 Family Laophontidae T. Scott, 1905
               26 Family Laophontopsidae Huys & Willems, 1989
               27 Family Latiremidae Bozic, 1969
               28 Family Leptastacidae Lang, 1948
               29 Family Leptopontiidae Lang, 1948
               30 Family Longipediidae G.O. Sars, 1903
               31 Family Louriniidae Monard, 1927
               32 Family Metidae G.O. Sars, 1910
               33 Family Miraciidae Dana, 1846
               34 Family Neobradyidae Olofsson, 1917
               35 Family Normanellidae Lang, 1944
               36 Family Novocriniidae Huys & Iliffe, 1998
               37 Family Orthopsyllidae R. Huys, 1990
               38 Family Paramesochridae Lang, 1944
               39 Family Parastenheliidae Lang, 1936
               40 Family Parastenocarididae Chappuis, 1933
               41 Family Peltidiidae G.O. Sars, 1904
               42 Family Phyllognathopodidae Gurney, 1932
               43 Family Porcellidiidae Boeck, 1865
               44 Family Pseudotachidiidae Lang, 1936
               45 Family Rhizothricidae Por, 1986
               46 Family Rotundiclipeidae R. Huys, 1988
               47 Family Styracothoracidae R. Huys, 1993 see Family Idyanthidae Lang, 1948
               48 Family Superornatiremidae Huys, 1997
               49 Family Tachidiidae Boeck, 1865
               50 Family Tegastidae G.O. Sars, 1904
               51 Family Tetragonicipitidae Lang, 1944
               52 Family Thalestridae G.O. Sars, 1905
               53 Family Thompsonulidae Lang, 1944
               54 Family Tisbidae Stebbing, 1910