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  Plantae
      Chlorophyta
        Prasinophytina
            Pyramimonadophyceae
                    Pyramimonadales
                            Pterospermataceae
                                     Hexasterias
                                             Hexasterias problematica
                                     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