[organisms] see Clade Biota Wagner 2004 [Wiemann, de Queiroz, Rowe, Planavsky, Anderson, Gogarten, Turner & Gauthier 2020]
   Crustacea (Brünnich, 1772) - crustaceans see Superclass Crustacea Pennant, 1777
     Subclass Copepoda H. Milne-Edwards, 1840 - copepods
       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 Arenopontiidae Martínez Arbizu & Moura, 1994
         07 Family Argestidae Por, 1986
         08 Family Balaenophilidae G.O. Sars, 1910
         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 Cletodidae T. Scott, 1905
         13 Family Cletopsyllidae Huys & Willems, 1989
         14 Family Clytemnestridae A. Scott, 1909
         15 Family Cristacoxidae Huys, 1990
         16 Family Cylindropsyllidae G.O. Sars, 1909
         17 Family Darcythompsoniidae Lang, 1936
         18 Family Diosaccidae G.O. Sars, 1906 see Family Miraciidae Dana, 1846
         19 Family Ectinosomatidae G.O. Sars, 1903
         20 Family Euterpinidae Brian, 1921
         21 Family Harpacticidae Dana, 1846
         22 Family Huntemanniidae Por, 1986
         23 Family Laophontidae T. Scott, 1905
         24 Family Laophontopsidae Huys & Willems, 1989
         25 Family Latiremidae Bozic, 1969
         26 Family Leptastacidae Lang, 1948
         27 Family Leptopontiidae Lang, 1948
         28 Family Longipediidae G.O. Sars, 1903
         29 Family Louriniidae Monard, 1927
         30 Family Metidae G.O. Sars, 1910
         31 Family Miraciidae Dana, 1846
         32 Family Neobradyidae Olofsson, 1917
         33 Family Normanellidae Lang, 1944
         34 Family Novocriniidae Huys & Iliffe, 1998
         35 Family Orthopsyllidae R. Huys, 1990
         36 Family Paramesochridae Lang, 1944
         37 Family Parastenheliidae Lang, 1936
         38 Family Parastenocarididae Chappuis, 1933
         39 Family Peltidiidae G.O. Sars, 1904
         40 Family Phyllognathopodidae Gurney, 1932
         41 Family Porcellidiidae Boeck, 1865
         42 Family Psammopsyllidae see Subfamily Psammopsyllinae
         43 Family Pseudotachidiidae Lang, 1936
         44 Family Rhizothricidae Por, 1986
         45 Family Rotundiclipeidae R. Huys, 1988
         46 Family Superornatiremidae Huys, 1997
         47 Family Tachidiidae Boeck, 1865
         48 Family Tegastidae G.O. Sars, 1904
         49 Family Tetragonicipitidae Lang, 1944
         50 Family Thalestridae G.O. Sars, 1905
         51 Family Thompsonulidae Lang, 1944
         52 Family Tisbidae Stebbing, 1910