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Organism
  Plantae
   Viridiplantae
    Chlorophyta
           [Prasinophyta]
        Prasinophytina
            Pyramimonadophyceae
                   [Prasinophyceae]
                    Pyramimonadales
                            Pterospermataceae
                                     Hexasterias
                                             Hexasterias problematica
                                                   [Polyasterias problematica]
                                     Polyasterias
                                     Pterosperma
                                             Pterosperma cristatum
                                             Pterosperma cuboides
                                             Pterosperma dictyon
                                             Pterosperma marginatum
                                             Pterosperma michaelsarsi
                                             Pterosperma moebii
                                             Pterosperma nationalis
                                             Pterosperma parallelum
                                             Pterosperma polygonum
                                             Pterosperma rotundum
                                             Pterosperma vanhoeffeni
                                     Sphaeropsis
                                             Sphaeropsis laevigata