Between brackets is the number of accepted species
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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
- Family Acinetosporaceae Hamel ex J. Feldmann, 1937
- Family Acrotrichaceae accepted as Chordariaceae Greville, 1830
- Family Adenocystaceae F. Rousseau, B. de Reviers, M.-C. Leclerc, A. Asensi & R. Delépine
- Family Asperococcaceae accepted as Chordariaceae Greville, 1830
- Family Buffhamiaceae accepted as Chordariaceae Greville, 1830
- Family Chnoosporaceae Setchell & Gardner, 1925 accepted as Scytosiphonaceae Farlow, 1881
- Family Chordariaceae Greville, 1830
- Genus Acrocytis Rosenvinge, 1933
- Genus Acrospongium Schiffner, 1916
- Genus Acrothrix Kylin, 1907
- Genus Acrotrichium H.B.S. Womersley & S. Skinner in H.B.S. Womersley, 1987
- Genus Actinema Reinsch, 1874-1875
- Genus Adriogloia Ercegovic, 1955
- Genus Aegira Fries, 1825 accepted as Eudesme J.G. Agardh, 1882
- Genus Areschougia Meneghini, 1844 accepted as Elachista Duby, 1830
- Genus Ascocyclus Magnus, 1874
- Genus Ascoseirophila A.F. Peters, 2003
- Genus Asperococcus J.V.F. Lamouroux, 1813
- Genus Asterotrichia Zanardini, 1843
- Genus Australofilum A.F. Peters, 2003
- Genus Austrofilum A.F. Peters, 2003
- Genus Bactrophora J.G. Agardh, 1882 accepted as Cladosiphon Kützing, 1843
- Genus Botrytella Bory de Saint-Vincent, 1822
- Genus Buffhamia Batters, 1895
- Genus Carmichaelia Greville, 1827 accepted as Striaria Greville, 1828
- Genus Castagnea A. Derbès & A. Solier, 1851 accepted as Cladosiphon Kützing, 1843
- Genus Centrospora Trevisan, 1845 accepted as Elachista Duby, 1830
- Genus Chilionema Sauvageau, 1898
- Genus Chordaria C.A. Agardh, 1817
- Genus Chukchia R.T. Wilce, P.M. Pedersen & S. Sekida, 2009
- Genus Cladochroa Skottsberg, 1921
- Genus Cladosiphon Kützing, 1843
- Genus Cladothele J.D. Hooker & W.H. Harvey, 1845
- Genus Clathrodiscus G. Hamel, 1935
- Genus Clavatella Bory de Saint-Vincent, 1823 accepted as Leathesia S.F. Gray, 1821
- Genus Climacosorus Sauvageau, 1933
- Genus Coelocladia Rosenvinge, 1893
- Genus Coilodesme Strömfelt, 1886
- Genus Coilonema J.E. Areschoug, 1872 accepted as Dictyosiphon Greville, 1830
- Genus Corycus Kjellman, 1889
- Genus Corynephora C.A. Agardh, 1824 accepted as Leathesia S.F. Gray, 1821
- Genus Corynophlaea Kützing, 1843
- Genus Corynophora accepted as Corynephora C.A. Agardh, 1824
- Genus Cylindrocarpus H.M. Crouan & P.L. Crouan, 1851
- Genus Dalmatogloia Ercegovic, 1955
- Genus Delamarea Hariot, 1889
- Genus Dermatocelis Rosenvinge, 1898
- Genus Desmotrichium accepted as Desmotrichum Kützing, 1845
- Genus Desmotrichum Kützing, 1845
- Genus Dichosporangium Hauck, 1884
- Genus Dictyosiphon Greville, 1830
- Genus Diplostromium Kützing, 1843 accepted as Punctaria Greville, 1830
- Genus Dudresnaya Bonnemaison, 1822
- Genus Elachista Duby, 1830
- Genus Elachistiella V. Cassano, Y. Yoneshigue-Valentin & M.J. Wynne, 2004
- Genus Encoelium C.A. Agardh, 1820 accepted as Asperococcus J.V.F. Lamouroux, 1813
- Genus Endodictyon H. Gran, 1897 accepted as Streblonema A. Derbès & A. Solier in L. Castagne, 1851
- Genus Entonema Reinsch, 1875
- Genus Eudesme J.G. Agardh, 1882
- Genus Farlowiella Kornmann, 1956 accepted as Hummia J. Fiore, 1975
- Genus Fascia S.F. Gray, 1821 accepted as Petalonia Derbès & Solier, 1850
- Genus Fasciaria J.E. Gray, 1864
- Genus Fasciata S.F. Gray, 1821 accepted as Petalonia Derbès & Solier, 1850
- Genus Flabellonema Skinner & Womersley, 1984
- Genus Fosliea Reinke, 1891
- Genus Giraudia A. Derbès & A. Solier in L. Castagne, 1851
- Genus Gonodia Nieuwland, 1917 accepted as Myriactula O. Kuntze, 1898
- Genus Gononema Kuckuck & Skottsberg, 1921
- Genus Gontrania Sauvageau, 1936
- Genus Halodictyon Kützing, 1843
- Genus Haloglossum Kützing, 1843 accepted as Asperococcus J.V.F. Lamouroux, 1813
- Genus Halonema Jaasund, 1951
- Genus Halorhipis Saunders, 1898
- Genus Halorhiza Kützing, 1843
- Genus Halothrix Reinke, 1888
- Genus Hamelella Børgesen, 1942
- Genus Hecatonema Sauvageau, 1898 '1897'
- Genus Helminthocladia W.H. Harvey, 1838
- Genus Heterophycus Trevisan, 1848
- Species Heterophycus balticus (Kützing) Trevisan
- Species Heterophycus plumosus (Kützing) Trevisan
- Genus Heterosaundersella Tokida, 1942
- Genus Homeostroma J.G. Agardh, 1896 accepted as Homoeostroma J.G. Agardh, 1896
- Genus Homoeostroma J.G. Agardh, 1896
- Genus Hummia J. Fiore, 1975
- Genus Isthmoplea Kjellman, 1877
- Genus Kjellmania Reinke, 1888 accepted as Stictyosiphon Kützing, 1843
- Genus Kolderupia S. Lund, 1959 ex R. Wilce, 1966 accepted as Pleurocladia A. Braun in L. Rabenhorst, 1855
- Genus Kurogiella H. Kawai, 1993
- Genus Laethesia accepted as Leathesia S.F. Gray, 1821
- Genus Laminariocolax Kylin, 1947
- Genus Laminarionema H. Kawai & M. Tokuyama, 1995
- Genus Leathesia S.F. Gray, 1821
- Genus Leblondiella G. Hamel, 1939
- Genus Leptonema Reinke, 1888 accepted as Leptonematella P.C. Silva, 1959
- Genus Leptonematella P.C. Silva, 1959
- Genus Levringia Kylin, 1940
- Genus Liebmannia J.G. Agardh, 1842
- Genus Liebmannia G. Meneghini, 1843 accepted as Nemacystus A. Derbès & A. Solier, 1850
- Genus Litosiphon Harvey, 1849
- Genus Melanosiphon M.J. Wynne, 1969
- Genus Melastictis P.F. Reinsch in G. Neumayer, 1890
- Genus Meneghiniella W.A. Setchell & N.L. Gardner, 1924 accepted as Nemacystus A. Derbès & A. Solier, 1850
- Genus Mesogloia C.A. Agardh, 1817
- Genus Mesogloiopsis H.B.S. Womersley & A. Bailey in H.B.S. Womersley, 1987
- Genus Microcoryne Strömfelt, 1888
- Genus Microspongium Reinke, 1888
- Genus Mikrosyphar Kuckuck, 1895
- Genus Monosiphon L. Volkov, 1916
- Genus Myelophycus Kjellman in Engler & Prantl, 1893
- Genus Myriactis Kützing, 1843 accepted as Myriactula O. Kuntze, 1898
- Genus Myriactula O. Kuntze, 1898
- Genus Myriocladia J.G. Agardh, 1841
- Genus Myriogloea P. Kuckuck ex F. Oltmanns, 1922
- Genus Myrionema Greville, 1827
- Genus Myriotrichia Harvey, 1834
- Genus Nemacystus A. Derbès & A. Solier, 1850
- Genus Nematophlaea J.G. Agardh, 1896
- Genus Neoleptonema E.-Y. Lee & I.K. Lee in E.-Y. Lee, P.M. Pedersen & I.K. Lee, 2002
- Genus Omphalophyllum Rosenvinge, 1893
- Genus Opospermum C.S. Rafinesque, 1814 accepted as Elachista Duby, 1830
- Genus Papenfussiella Kylin, 1940
- Genus Phacochorda Trevisan, 1849
- Genus Phaeocladia Gran, 1893 accepted as Phaeostroma Kuckuck, 1893
- Genus Phaeophysema A. Tanaka, S. Uwai & H. Kawai in Tanaka, Uwai, Nelson & Kawai, 2010
- Genus Phaeosphaerium Kjellman, 1890 accepted as Myrionema Greville, 1827
- Genus Phaeostromatella P.[J.L.] Dangeard, 1970
- Genus Philippia Kuckuck, 1929 accepted as Elachista Duby, 1830
- Genus Philippiella P.C. Silva, 1959 accepted as Elachista Duby, 1830
- Genus Phloeospora J.E. Areschoug, 1873 accepted as Stictyosiphon Kützing, 1843
- Genus Phloesphora accepted as Phloeospora J.E. Areschoug, 1873
- Genus Phloespora
- Genus Phycocelis Strömfelt, 1888
- Genus Phycocoelis accepted as Phycocelis Strömfelt, 1888
- Genus Phycolapathum Kützing, 1843 accepted as Petalonia Derbès & Solier, 1850
- Genus Phycophila Kützing, 1843 accepted as Elachista Duby, 1830
- Genus Phymacium Link, 1833
- Genus Physematoplea Kjellman, 1890 accepted as Delamarea Hariot, 1889
- Genus Pilocladus Kornmann, 1954
- Genus Polycerea J.G. Agardh, 1882
- Genus Polytretus Sauvageau, 1900 accepted as Botrytella Bory de Saint-Vincent, 1822
- Genus Portphillipia P.C. Silva, 1970 accepted as Elachista Duby, 1830
- Genus Proselachista Y.-P. Lee & D.J. Garbary, 2000
- Genus Protasperococcus Sauvageau, 1931
- Genus Protectocarpus Kornmann, 1955
- Genus Punctaria Greville, 1830
- Genus Rhabdinocladia accepted as Rhadinocladia Schuh, 1900
- Genus Rhadinocladia Schuh, 1900
- Genus Ruprechtiella Yendo, 1913
- Genus Saundersella Kylin, 1940
- Genus Sauvageaugloia G. Hamel ex Kylin, 1940
- Genus Scytosiphon C.A. Agardh, 1811 accepted as Dictyosiphon Greville, 1830
- Genus Soranthera Postels & Ruprecht, 1840
- Genus Sorocarpus N. Pringsheim, 1862 accepted as Botrytella Bory de Saint-Vincent, 1822
- Genus Spermatochnus F.T. Kützing, 1843
- Genus Spermatochnus F.T. Kützing, 1843 [2] accepted as Stilophora J.G. Agardh, 1841
- Genus Sphaerotrichia Kylin, 1940
- Genus Stechastrum P.F. Reinsch in G. Neumayer, 1890 accepted as Stegastrum P.F. Reinsch in G. Neumayer, 1890
- Genus Stegastrum P.F. Reinsch in G. Neumayer, 1890
- Genus Stictyosiphon Kützing, 1843
- Genus Stilophora J.G. Agardh, 1841
- Genus Stilophora C.A. Agardh, 1827 accepted as Hydroclathrus Bory de Saint-Vincent, 1825
- Genus Stilopsis Kuckuck, 1929
- Genus Streblonema A. Derbès & A. Solier in L. Castagne, 1851 accepted as Myriotrichia Harvey, 1834
- Genus Streblonemopsis R. Valiante, 1883
- Genus Strepsithalia Bornet ex Sauvageau, 1896
- Genus Striaria Greville, 1828
- Genus Suringaria Kylin, 1940 accepted as Suringariella H.B.S. Womersley & A. Bailey in H.B.S. Womersley, 1987
- Genus Suringariella H.B.S. Womersley & A. Bailey in H.B.S. Womersley, 1987
- Genus Symphoricoccus Reinke, 1888 accepted as Elachista Duby, 1830
- Genus Tinocladia Kylin, 1940
- Genus Trachynema P.M. Pedersen, 1985
- Genus Trichocladia Harvey, 1836 accepted as Mesogloia C.A. Agardh, 1817
- Genus Ulonema Foslie, 1893
- Genus Vimineoleathesia A. Tanaka, S. Uwai & H. Kawai in Tanaka, Uwai, Nelson & Kawai, 2010
- Genus Zonarina Ørsted, 1844
- Genus Zonarius Ørsted, 1844
- Family Chordariopsidaceae Kylin, 1940 accepted as Adenocystaceae F. Rousseau, B. de Reviers, M.-C. Leclerc, A. Asensi & R. Delépine
- Family Coelocladiaceae Pedersen, 1976 accepted as Chordariaceae Greville, 1830
- Family Coilodesmaceae accepted as Chordariaceae Greville, 1830
- Family Corynophlaeaceae accepted as Chordariaceae Greville, 1830
- Family Delamareaceae accepted as Chordariaceae Greville, 1830
- Family Dictyosiphonaceae accepted as Chordariaceae Greville, 1830
- Family Ectocarpaceae C.A. Agardh, 1828
- Family Elachistaceae accepted as Chordariaceae Greville, 1830
- Family Giraudiaceae accepted as Chordariaceae Greville, 1830
- Family Leathesiaceae accepted as Chordariaceae Greville, 1830
- Family Myrionemataceae Nägeli, 1847 accepted as Chordariaceae Greville, 1830
- Family Myriotrichiaceae accepted as Chordariaceae Greville, 1830
- Family Petrospongiaceae
- Family Pilayellaceae accepted as Acinetosporaceae Hamel ex J. Feldmann, 1937
- Family Pogotrichaceae Pedersen, 1978 accepted as Acinetosporaceae Hamel ex J. Feldmann, 1937
- Family Pogotrichiaceae accepted as Acinetosporaceae Hamel ex J. Feldmann, 1937
- Family Punctariaceae accepted as Chordariaceae Greville, 1830
- Family Pylaiellaceae accepted as Acinetosporaceae Hamel ex J. Feldmann, 1937
- Family Scytosiphonaceae Farlow, 1881
- Family Sorocarpaceae accepted as Chordariaceae Greville, 1830
- Family Spermatochnaceae accepted as Chordariaceae Greville, 1830
- Family Striariaceae accepted as Chordariaceae Greville, 1830
- Order Fucales
- 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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