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Organism
  Animalia
      Nematoda
            Chromadorea
              Chromadoria
                    Strongylida
                            Strongylidae
                                     Cyathostomum
                                             Cyathostomum catinatum
                                     Cylicocyclus
                                             Cylicocyclus insigne
                                             Cylicocyclus nassatus
                                     Cylicostephanus
                                             Cylicostephanus goldi
                                             Cylicostephanus longibursatus
                                             Cylicostephanus minutus
                                     Gyalocephalus
                                             Gyalocephalus capitatus
                                     Oesophagostomum
                                             Oesophagostomum columbianum
                                             Oesophagostomum dentatum
                                             Oesophagostomum radiatum
                                             Oesophagostomum venulosum
                                     Strongylus
                                             Strongylus edentatus
                                             Strongylus equinus
                                             Strongylus vulgaris
                                     Triodontophorus
                                             Triodontophorus brevicauda
                                             Triodontophorus serratus
                                             Triodontophorus tenuicollis