[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 Cyclopoida Sars, 1886
         Family Chordeumiidae Boxshall, 1988
           1 Genus Chordeumium Stephensen, 1918
           2 Genus Ophioika Stephensen, 1934
           3 Genus Parachordeumium Le Calvez, 1938