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  Animalia
      Arthropoda
        Crustacea
            Maxillopoda
                   [Maxillipoda]
              Copepoda
                     [Lerneascidae]
                Neocopepoda
                  Gymnoplea
                    Calanoida
                            Stephidae
                                     Parastephos
                                             Parastephos esterlyi
                                             Parastephos occatum
                                             Parastephos pallidus
                                     Stephos
                                             Stephos arcticus
                                             Stephos deichmannae
                                             Stephos fultoni
                                             Stephos lamellatus
                                             Stephos longipes
                                             Stephos minor
                                             Stephos pacificus
                                             Stephos rustadi
                                             Stephos scotti