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
- Kingdom Fungi
- Kingdom Plantae
- Phylum Acritarcha †
- Phylum Algae (awaiting allocation)
- Phylum Algae incertae sedis
- Phylum Anthocerotophyta
- Phylum Bryophyta
- Phylum Calcitarcha †
- Phylum Charophyta
- Phylum Chlorophyta
- Subdivision Chlorophytina
- Class Bryopsidophyceae accepted as Ulvophyceae
- Class Chlorodendrophyceae
- Class Chlorophyceae
- Class Pedinophyceae
- Class Pleurastrophyceae accepted as Chlorophyceae
- Class Trebouxiophyceae
- Class Ulvophyceae
- Order Acrosiphoniales accepted as Ulotrichales
- Order Bryopsidales
- Order Chlorocystidales accepted as Ulotrichales
- Order Cladophorales
- Family Anadyomenaceae Kützing, 1843
- Family Arnoldiellaceae accepted as Cladophoraceae Wille, 1884
- Family Boodleaceae Børgesen, 1925
- Family Cladophoraceae Wille, 1884
- Family Cladophorales (awaiting allocation)
- Family Dictyosphaeriaceae Kützing, 1849 accepted as Siphonocladaceae Schmitz, 1879
- Family Okellyaceae F. Leliaert & J. Rueness in Leliaert, Rueness, Boedeker, Maggs, Cocquyt, Verbruggen & De Clerck, 2009
- Genus Okellya F. Leliaert & J. Rueness in Leliaert, Rueness, Boedeker, Maggs, Cocquyt, Verbruggen & De Clerck, 2009
- Species Okellya curvata (Printz) Leliaert & Rueness, 2009
- Family Pithophoraceae
- Family Pseudocladophoraceae
- Family Siphonocladaceae Schmitz, 1879
- Family Valoniaceae Kützing, 1849
- Family Wittrockiellaceae accepted as Pithophoraceae
- Genus Proterocladus N.J. Butterfield in Butterfield et al., 1994 †
- Order Ctenocladales accepted as Ulvales
- Order Cyclocrinales †
- Order Dasycladales
- Order Ignatiales
- Order Oltmannsiellopsidales
- Order Phaeophilales accepted as Ulvales
- Order Scotinosphaerales
- Order Siphonales accepted as Bryopsidales
- Order Siphonocladales accepted as Cladophorales
- Order Trentepohliales
- Order Ulotrichales
- Order Ulvales
- Order Ulvophyceae (awaiting allocation)
- Genus Symbiochlorum S. Gong & Z. Li in Gong et al., 2018
- Subdivision Prasinophytina
- Class Chlorophyta (awaiting allocation)
- Class Chloropicophyceae
- Class Picocystophyceae
- Class Prasinophyceae accepted as Prasinophytina
- Genus Archaeochaeta K.M. Maloney, D.P. Maverick, J.D. Schiffbauer, G.P. Halverson, S. Xiao & M. Laflamme, 2023 †
- Genus Archaeophycus F. Wang, X. Zhang & R. Guo, 1983 †
- Genus Chordecystia C.B. Foster, 1979 † accepted as Reduviasporonites L.R. Wilson, 1962 †
- Genus Dictyosphaera Y. Xing & K. Liu, 1973 †
- Genus Jiuqunaoella M. Chen & Z.Z. Xiao, 1991 †
- Genus Menieria Y. Wang, J. Jin & R. Zhan, 2014 †
- Genus Palambages O. Wetzel, 1961 †
- Genus Reduviasporonites L.R. Wilson, 1962 †
- Genus Sarcinophycus S. Xiao & A.H. Knoll, 1999 †
- Genus Shuiyousphaeridium Yan in Yan & Zhu, 1992 †
- Genus Sphaerosiphon Schussnig, 1915
- Genus Tympanicysta B.E. Balme, 1980 † accepted as Reduviasporonites L.R. Wilson, 1962 †
- Phylum Eophyta †
- Phylum Glaucophyta
- Phylum Gymnospermophyta accepted as Tracheophyta
- Phylum Horneophyta †
- Phylum Magnoliophyta accepted as Tracheophyta
- Phylum Marchantiophyta
- Phylum Picozoa
- Phylum Plantae (awaiting allocation)
- Phylum Prasinodermatophyta
- Phylum Pteridophyta accepted as Tracheophyta
- Phylum Rhodelphidia
- Phylum Rhodophyta
- Phylum Sporae dispersae †
- Phylum Tracheophyta
- Phylum Vendophyta † accepted as Algae incertae sedis
- Class Nematophyceae † accepted as Nematophyta †
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Kingdom Viruses
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