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Organism
  Chromista
         [Microbe]
      Chrysophyta
            Bacillariophyceae
                          Lymnaeoidea
                            Planorbidae
                                     Armiger
                                             Armiger crista
                                     Biomphalaria
                                             Biomphalaria glabrata
                                             Biomphalaria havanensis
                                     Ferrissia
                                             Ferrissia californica
                                                   [Ferrissia fragilis]
                                     Ferrissia
                                             Ferrissia rivularis
                                             Ferrissia walkeri
                                     Ferrissia
                                             Ferrissia sharpi
                                     Gyraulus
                                             Gyraulus circumstriatus
                                     Gyraulus
                                             Gyraulus crista
                                             Gyraulus deflectus
                                             Gyraulus parvus
                                     Hebetancylus
                                             Hebetancylus excentricus
                                     Helisoma
                                             Helisoma anceps
                                             Helisoma newberryi
                                             Helisoma subcrenatum
                                     Laevapex
                                             Laevapex fuscus
                                     Menetus
                                             Menetus dilatatus
                                             Menetus floridensis
                                             Menetus opercularis
                                     Planorbella
                                             Planorbella campanulata
                                             Planorbella duryi
                                             Planorbella pilsbryi
                                             Planorbella scalaris
                                             Planorbella subcrenata
                                             Planorbella tenuis
                                             Planorbella trivolvis
                                     Planorbula
                                             Planorbula armigera
                                             Planorbula campestris
                                     Promenetus
                                             Promenetus exacuous
                                             Promenetus umbilicatellus
                                     Uncancylus
                                             Uncancylus concentricus
                                     Vorticifex