AlgaeBase Taxonomic Thesaurus
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  Chromista
                            Papposphaeraceae
                                     Calciarcus
                                             Calciarcus alaskensis
                                     Pappomonas
                                             Pappomonas flabellifera
                                               Pappomonas flabellifera var. borealis
                                             Pappomonas virgulosa
                                             Pappomonas weddellensis
                                     Papposphaera
                                             Papposphaera arctica
                                                   [Papposphaera sarion]
                                                   [Turrisphaera arctica]
                                             Papposphaera borealis
                                                   [Papposphaera sagittifera]
                                                   [Turrisphaera borealis]
                                             Papposphaera bourrellii
                                             Papposphaera bourrellyi
                                             Papposphaera lepida
                                             Papposphaera obpyramidalis
                                             Papposphaera polybotrys
                                                   [Turrisphaera polybotrys]
                                             Papposphaera simplicissima
                                             Papposphaera thomsenii
                                     Picarola
                                             Picarola margalefii
                                     Trigonaspis
                                             Trigonaspis diskoensis
                                             Trigonaspis melvilleae
                                             Trigonaspis minutissima
                                     Wigwamma
                                             Wigwamma annulifera
                                             Wigwamma antarctica
                                             Wigwamma arctica
                                             Wigwamma scenozonion
                                             Wigwamma triradiata