Central Taxonomic Thesaurus
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  Animalia
      Arthropoda
        Crustacea
            Maxillopoda
                   [Maxillipoda]
              Copepoda
                     [Lerneascidae]
                Neocopepoda
                  Podoplea
                    Siphonostomatoida
                           [Caligoida]
                           [Lernaeopodoida]
                            Nicothoidae
                                     Hansenulus
                                             Hansenulus trebax
                                     Sphaeronella
                                             Sphaeronella intermedia
                                             Sphaeronella spinosa
                                     Sphaeronellopsis
                                             Sphaeronellopsis hebe
                                             Sphaeronellopsis monothrix