AlgaeBase Taxonomic Thesaurus
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  Chromista
      Heterokontophyta
            Coscinodiscophyceae
                    Arachnoidiscales
                            Arachnoidiscaceae
                                     Arachnoidiscus
                                           [Arachnodiscus]
                                           [Hemiptychus]
                                             Arachnoidiscus abnormis
                                             Arachnoidiscus adamsii
                                             Arachnoidiscus antiquus
                                             Arachnoidiscus barbadensis
                                             Arachnoidiscus beringensis
                                             Arachnoidiscus cibdelus
                                             Arachnoidiscus clarus
                                             Arachnoidiscus cognatus
                                             Arachnoidiscus confusus
                                             Arachnoidiscus decorus
                                             Arachnoidiscus deficiens
                                             Arachnoidiscus ehrenbergii
                                                   Arachnoidiscus ehrenbergii f. palaeocaenicus
                                               Arachnoidiscus ehrenbergii var. californicus
                                               Arachnoidiscus ehrenbergii var. deficiens
                                               Arachnoidiscus ehrenbergii var. evanescens
                                               Arachnoidiscus ehrenbergii var. indicus
                                               Arachnoidiscus ehrenbergii var. javanicus
                                               Arachnoidiscus ehrenbergii var. montereyanus
                                               Arachnoidiscus ehrenbergii var. nankoorensis
                                               Arachnoidiscus ehrenbergii var. oamaruensis
                                               Arachnoidiscus ehrenbergii var. splendens
                                             Arachnoidiscus evanescens
                                               Arachnoidiscus evanescens var. paulus
                                             Arachnoidiscus formosus
                                             Arachnoidiscus giganteus
                                             Arachnoidiscus grevilleanus
                                                   Arachnoidiscus grevilleanus f. typica
                                             Arachnoidiscus hannai
                                             Arachnoidiscus hungaricus
                                             Arachnoidiscus hustedtii
                                             Arachnoidiscus hybridus
                                             Arachnoidiscus indicus
                                               Arachnoidiscus indicus var. borealis
                                             Arachnoidiscus interruptus
                                             Arachnoidiscus japonicus
                                             Arachnoidiscus lepidus
                                             Arachnoidiscus longii
                                             Arachnoidiscus major
                                             Arachnoidiscus mannii
                                             Arachnoidiscus millsii
                                             Arachnoidiscus nicobaricus
                                             Arachnoidiscus oamaruensis
                                             Arachnoidiscus ornatus
                                                   Arachnoidiscus ornatus f. typicus
                                               Arachnoidiscus ornatus var. dispar
                                               Arachnoidiscus ornatus var. montereianus
                                               Arachnoidiscus ornatus var. obscurus
                                             Arachnoidiscus parvulus
                                             Arachnoidiscus russicus
                                             Arachnoidiscus schmidtii
                                             Arachnoidiscus sendaicus
                                             Arachnoidiscus simbirscianus
                                             Arachnoidiscus similis
                                             Arachnoidiscus spissus
                                             Arachnoidiscus splendens

Problematic Rooting (5819)
                                             Hemiptychus ornatus