Kingdom Animalia Linnaeus, 1758 - animals
   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
           Order Siphonostomatoida Thorell, 1859
             Genus Clavella Oken, 1815
             Genus Nemesis Risso, 1826
             Genus Penella Burmeister, 1835 see Genus Pennella Oken, 1815
             Genus Pontoeciella Giesbrecht, 1895
             Genus Trebius Krøyer, 1838