Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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- Biota
- Kingdom Animalia
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Subkingdom Hacrobia
- Subkingdom Harosa
- Infrakingdom Halvaria
- Superphylum Alveolata
- Superphylum Heterokonta
- Phylum Bacillariophyta
- Phylum Bigyra
- Phylum Chrysophyta accepted as Ochrophyta
- Phylum Diatomaceae accepted as Bacillariophyta
- Phylum Eustigmatophyta accepted as Ochrophyta
- Phylum Heterokontophyta accepted as Ochrophyta
- Phylum Hyphochytriomycota accepted as Pseudofungi
- Phylum Labyrinthista accepted as Bigyra
- Phylum Ochrophyta
- Class Aurearenophyceae accepted as Phaeothamniophyceae
- Class Aurophyceae accepted as Phaeothamniophyceae
- Class Bolidophyceae
- Class Chrysomeridophyceae
- Class Chrysoparadoxophyceae
- Class Chrysophyceae
- Class Dictyochophyceae
- Class Eustigmatophyceae
- Class Hyphochytriomycetes accepted as Hyphochytrea
- Class Olisthodiscophyceae
- Class Pelagophyceae
- Class Phaeophyceae
- Order Ascoseirales
- Order Asterocladales
- Order Chordales
- Order Chordariales accepted as Ectocarpales
- Order Cutleriales accepted as Tilopteridales
- Order Desmarestiales
- Order Dictyosiphonales accepted as Ectocarpales
- Order Dictyotales
- Order Discosporangiales
- Order Durvillaeales accepted as Fucales
- Order Ectocarpales
- Order Fucales
- Family Bifurcariopsidaceae
- Family Cystoseiraceae De Toni, 1891 accepted as Sargassaceae Kützing, 1843
- Family Durvillaeaceae (Oltmanns) De Toni, 1891
- Family Fucaceae Adanson, 1763
- Family Himanthaliaceae (Kjellman) De Toni, 1891
- Genus Funicularius Roussel, 1806 accepted as Himanthalia Lyngbye, 1819
- Species Funicularius tuberculatus Roussel, 1806 accepted as Himanthalia elongata (Linnaeus) S.F. Gray, 1821
- Genus Himanthalia Lyngbye, 1819
- Genus Himanthallia accepted as Himanthalia Lyngbye, 1819
- Genus Lorea Stackhouse, 1809 accepted as Himanthalia Lyngbye, 1819
- Genus Loricaria J.V.F. Lamouroux in Bory de St.-Vincent, 1825 accepted as Himanthalia Lyngbye, 1819
- Genus Pantocarpus De la Pylaie, 1830 accepted as Himanthalia Lyngbye, 1819
- Family Hormosiraceae Fritsch, 1945
- Family Notheiaceae O.C. Schmidt, 1938
- Family Phyllosporaceae accepted as Seirococcaceae Nizamuddin, 1962
- Family Sargassaceae Kützing, 1843
- Family Seirococcaceae Nizamuddin, 1962
- Family Xiphophoraceae
- Genus Liasophycus P. Fliche, 1909 †
- Genus Staurofucus G.P. Radczenko in L.D. Kiparisova, B.P. Markovskij & G.P. Radczenko, 1956 †
- Order Ishigeales
- Order Laminariales
- Order Nemodermatales
- Order Onslowiales
- Order Phaeosiphoniellales
- Order Ralfsiales
- Order Scytosiphonales accepted as Ectocarpales
- Order Scytothamnales
- Order Sphacelariales
- Order Sporochnales
- Order Stschapoviales
- Order Syringodermatales
- Order Tilopteridales
- Family Archyfasmaceae Gnilovskaya, 2003 †
- Family Phaeophyceae (awaiting allocation)
- Genus Caulerpites (A.T. Brongniart) Sternberg, 1833 †
- Genus Dichothallus S.V. Naugolnykh, 2018 †
- Genus Gracilogia Ding in Ding et al., 1992 †
- Genus Houjiashania J. Liu et al., 2024 †
- Genus Jonssonia S. Lund, 1959
- Genus Miaohephyton M. Chen & Z.Z. Xiao, 1991 †
- Genus Phasganon Targioni-Tozzetti, 1826
- Genus Phasgonon Walker ex S.F. Gray, 1821
- Genus Pilonema Derbès & Solier, 1851
- Genus Porterinema Waern, 1952
- Genus Prototilopteris Funk, 1927 accepted as Zosterocarpus Bornet, 1890
- Genus Pseudobodanella J. Gerloff, 1967 accepted as Porterinema Waern, 1952
- Genus Sorapion Kuckuck, 1894
- Genus Zosterocarpus Bornet, 1890
- Class Phaeosacciophyceae
- Class Phaeothamniophyceae
- Class Picophagea accepted as Picophagophyceae
- Class Picophagophyceae
- Class Pinguiophyceae
- Class Raphidophyceae
- Class Schizocladiophyceae
- Class Synchromophyceae
- Class Synurophyceae accepted as Chrysophyceae
- Class Tribophyceae accepted as Xanthophyceae
- Class Xanthophyceae
- Family Ochrophyta incertae sedis
- Phylum Oomycota accepted as Pseudofungi
- Phylum Phaeophyta accepted as Ochrophyta
- Phylum Pseudofungi
- Phylum Raphidophyta accepted as Ochrophyta
- Phylum Sagenista accepted as Bigyra
- Phylum Xanthophyta accepted as Ochrophyta
- Subphylum Bigyromonada
- Class Bigyromonadea accepted as Developea
- Family Kaonashiidae Weston, Eglit & Simpson, 2023
- Infrakingdom Rhizaria
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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