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  Animalia
      Annelida
            Polychaeta
                   [Lysareunicidae]
              Scolecida
                            Opheliidae
                                     Ammotrypanella
                                             Ammotrypanella arctica
                                     Antiobactrum
                                             Antiobactrum brasiliensis
                                                   [Ophelina brasiliensis]
                                     Armandia
                                             Armandia agilis
                                             Armandia bioculata
                                             Armandia brevis
                                             Armandia cirrhosa
                                             Armandia intermedia
                                             Armandia leptocirrus
                                             Armandia longicaudata
                                             Armandia maculata
                                             Armandia melanura
                                             Armandia polyophthalma
                                     Euzonus
                                             Euzonus arcticus
                                             Euzonus dillonensis
                                             Euzonus flabelligerus
                                             Euzonus mucronata
                                             Euzonus williamsi
                                     Kesun
                                             Kesun fusus
                                             Kesun gravieri
                                     Ophelia
                                             Ophelia assimilis
                                             Ophelia bicornis
                                             Ophelia borealis
                                             Ophelia celtica
                                             Ophelia denticulata
                                             Ophelia limacina
                                             Ophelia magna
                                             Ophelia neglecta
                                             Ophelia profunda
                                             Ophelia pulchella
                                             Ophelia rathkei
                                             Ophelia roscoffensis
                                     Ophelina
                                           [Ammotrypane]
                                             Ophelina abranchiata
                                             Ophelina acuminata
                                             Ophelina aulogaster
                                                   [Ammotrypane aulogaster]
                                             Ophelina aulogastrella
                                             Ophelina breviata
                                                   [Ammotrypane breviata]
                                             Ophelina cylindricaudata
                                                   [Ammotrypane cylindricaudatus]
                                             Ophelina fimbriata
                                                   [Ammotrypane fimbriata]
                                             Ophelina groenlandica
                                                   [Ammotrypane groenlandica]
                                             Ophelina hachaensis
                                             Ophelina modesta
                                             Ophelina norvegica
                                             Ophelina pallida
                                                   [Ammotrypane pallida]
                                     Polyophthalmus
                                             Polyophthalmus pictus
                                     Tachytrypane
                                             Tachytrypane jeffreysi
                                     Thoracophelia
                                             Thoracophelia mucronata
                                     Travisia
                                             Travisia brevis
                                             Travisia carnea
                                             Travisia forbesii
                                             Travisia gigas
                                             Travisia granulata
                                             Travisia gravieri
                                             Travisia hobsonae
                                             Travisia japonica
                                             Travisia parva
                                             Travisia profundi
                                             Travisia pupa
                                                   [Travisia foetida]