AlgaeBase Taxonomic Thesaurus
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  Chromista
      Ciliophora
            Ciliatea
                    Oligotrichida
                            Ptychocylididae
                                     Favella
                                             Favella ehrenbergii
                                             Favella serrata
                                     Ptychocylis
                                             Ptychocylis acuta
                                             Ptychocylis drygalskii
                                             Ptychocylis minor
                                             Ptychocylis obtusa
                                             Ptychocylis urnula