Akraea U. Lortou & S. Gkelis in Lortou et al., 2022 (current name source)
Akraea U. Lortou & S. Gkelis in Lortou et al., 2022 (verified source for family)
Albertania G. Zammit, 2018 (verified source for family)
Aliinostoc S.N. Bagchi, N. Dubey & P. Singh, 2017 (verified source for family)
Alkalinema M.G.M.V. Vaz, D.B. Genuário, A.P.D. Andreote, C.F.S. Malone, C.L. Sant'Anna, L. Barbiero & M.F. Fiore, 2015 (verified source for family)
Amazoninema D.B. Genuário, W.R. de Souza, R.T.R. Monteiro, C.L. Sant'Anna & I.T.S. Melo, 2020 (verified source for family)
Amphirytos M. Panou & S. Gkelis in Jasser et al., 2022 (verified source for family)
Anathece (J. Komárek & K. Anagnostidis) J. Komárek, J. Kastovsky & J. Jezberová, 2011 (verified source for family)
Annamia L.T.T. Nguyen in Nguyen et al., 2013 (verified source for family)
Anthemodiscus J.W. Barker & S.H. Meakin, 1944 † accepted as Actinodictyon Pantocsek, 1889 † (source of synonymy)
Areschougia Trevisan, 1845 accepted as Lenormandia Sonder, 1845 (source of synonymy)
Aristella Kützing, 1834 (status source)
Astasia C.G. Ehrenberg, 1830 accepted as Euglena Ehrenberg, 1830 (source of synonymy)
Ava U. Lortou & S. Gkelis in Lortou et al., 2022 (verified source for family)
Ava U. Lortou & S. Gkelis in Lortou et al., 2022 (current name source)
Baaleninema O.S. Samylina, M.A. Sinetova, E.V. Kupriyanova & T.P. Tourova in Samylina et al., 2021 (verified source for family)
Botryochloropsis H.R. Preisig & C. Wilhelm, 1989 (verified source for family)
Brachtia Trevisan, 1848 accepted as Palmophyllum Kützing, 1847 (source of synonymy)
Caldora N. Engene, A. Tronholm & V.J. Paul in Engene et al., 2015 (verified source for family)
Calenema V. Ramos, Â. Brito & J. Kaštovský in Brito et al., 2017 (verified source for family)
Calothrix C.A. Agardh ex Bornet & Flahault, 1886 (verified source for family)
Calotrichaceae M.C. Cooke, 1890 (basis of record)
Calotrichaceae M.C. Cooke, 1890 (name verified source)
Calotrichaceae M.C. Cooke, 1890 (taxonomy source)
Calotrichaceae M.C. Cooke, 1890 (current name source)
Chamaethrix P. Dvořák, P. Hašler, P. Pitelková, P. Tabáková, D.A. Casamatta & A. Poulíčková, 2017 (verified source for family)
Characiopsis A. Borzì, 1895 (verified source for family)
Chlamydomonadales accepted as Volvocales (source of synonymy)
Chlorocystidaceae Kornmann & Sahling, 1983 (name verified source)
Chlorocystidaceae Kornmann & Sahling, 1983 (taxonomy source)
Chlorocystidaceae Kornmann & Sahling, 1983 (current name source)
Chlorocystidales (taxonomy source)
Chlorocystidales (name verified source)
Chlorocystidales (current name source)
Chlorocystidales (extant flag source)
Chlorocystis L. Reinhard, 1885 (verified source for family)
Chlorogloea Wille, 1900 (verified source for family)
Chlorolilaea U. Lortou & S. Gkelis in Gkelis, 2023 (current name source)
Coccoidesmus Q.H. Wang, Y. Hou & G.X. Liu in Wang et al., 2024 (status source)
Coleochlamys Korshikov, 1953 (verified source for family)
Compactococcus P. Jung, B. Büdel & M. Lakatos in Jung et al., 2021 (verified source for family)
Crocosphaera J. Mareš, J.R. Johansen, T. Hauer, J. Zima, S. Ventura, O. Cuzman, B. Tiribilli & J. Kaštovský, 2019 (additional source)
Crumenula Dujardin, 1836 accepted as Euglena Ehrenberg, 1830 (source of synonymy)
Cryptococcum W.A. Gama, J. Rigonato, M.F. Flore & C.L. Sant'Anna, 2019 (verified source for family)
Cyanidioschyzonaceae F.D. Ott, 2009 (current name source)
Cyanidioschyzonales (basis of record)
Cyanidioschyzonales (taxonomy source)
Cyanidioschyzonales (name verified source)
Cyanidioschyzonales (current name source)
Cyanidioschyzonales (extant flag source)
Cyanobacteriaceae J. Komárek, J. Kaštovský, J. Mareš & J.R. Johansen, 2014 accepted as Geminocystaceae A. Tuji, H. Yamaguchi & Y. Niiyama in Tuji et al., 2021 (source of synonymy)
Cyanobacterium Rippka & Cohen-Bazire in Oren et al., 2022 (verified source for family)
Cyanobium Rippka & Cohen-Bazire, 1983 (verified source for family)
Cyanomargarita S. Shalygin, R. Shalygina & J.R. Johansen in Shalygin et al., 2017 (verified source for family)
Cymbosira Kützing, 1844 accepted as Achnanthes Bory de Saint-Vincent, 1822 (source of synonymy)
Dapis N. Engene, A. Tronholm & V.J. Paul, 2018 (verified source for family)
Dapisostemon G.S. Hentschke, C.L. Sant'Anna & J.R. Johansen in Hentschke et al., 2016 (verified source for family)
Dapisostemonaceae G.S. Hentschke, C.L. Sant'Anna & J.R. Johansen in Hentschke et al., 2016 accepted as Tolypothrichaceae Hauer, Mareš, Bohunická, Johansen & Berrendero-Gomez, 2014 (source of synonymy)
Dasyphylla Stackhouse, 1816 accepted as Chondria C.A. Agardh, 1817 (source of synonymy)
Desmochloris S. Watanabe, N. Kuroda & F. Maiwa, 2001 (verified source for family)
Diomphala Ehrenberg, 1842 † accepted as Didymosphenia M. Schmidt in A. Schmidt, 1899 (source of synonymy)
Elainella E. Jahodářová, P. Dvořák & P. Hašler in Jahodárová et al., 2017 (verified source for family)
Electrophycus G. Poinar & A.E. Brown, 2019 † accepted as Eophylica C. Shi et al., 2022 † (status source)
Ellipsoidion Pascher, 1937 (verified source for family)
Embryocola Michajłow, 1969 (verified source for family)
Embryocolidae Michajłow, 1965 accepted as Parastasiellaceae (source of synonymy)
Emiliania huxleyi (Lohmann) W.W. Hay & H.P. Mohler, 1967 accepted as Gephyrocapsa huxleyi (Lohmann) Reinhardt, 1972 (source of synonymy)
Entogonia Greville, 1863 (verified source for family)
Epiphylla Stackhouse, 1816 accepted as Phyllophora Greville, 1830 (source of synonymy)
Euglenamorphaceae Cavalier-Smith, 2016 (taxonomy source)
Euglenamorphaceae Cavalier-Smith, 2016 (name verified source)
Euglenamorphaceae Cavalier-Smith, 2016 (basis of record)
Euglenamorphaceae Cavalier-Smith, 2016 (current name source)
Ewamiania G.B. McGregor & B.C. Sendall, 2017 (verified source for family)
Fimbriaria Stackhouse, 1809 accepted as Odonthalia Lyngbye, 1819 (source of synonymy)
Flexibiddulphia R. Simonsen, 1987 † (verified source for family)
Foliisarcina D.O. Alvarenga, J. Rigonato, L.H.Z. Branco, I.S. Melo & M.F. Fiore, 2016 (verified source for family)
Geitleria Friedmann, 1955 (verified source for family)
Geitleriaceae C. Kilgore & J.R. Johansen in Kilgore et al., 2018 (current name source)
Geminobacterium V. Ramos, Â. Brito & J. Kaštovský in Brito et al., 2017 (verified source for family)
Geminocystis Korelusová, Kaštovský & Komárek, 2009 (verified source for family)
Gephyrocapsa huxleyi (Lohmann) Reinhardt, 1972 (current name source)
Gibliniella O. Strunecky & L. Raabova in Strunecky et al., 2019 (verified source for family)
Gloeocapsaceae Elenkin, 1933 (taxonomy source)
Gloeocapsaceae Elenkin, 1933 (name verified source)
Gloeocapsaceae Elenkin, 1933 (current name source)
Gloeomargarita D. Moreira et al., 2017 (verified source for family)
Gloeomargaritaceae D. Moreira et al., 2017 (current name source)
Gloeomargaritales (current name source)
Gloiococcus Shuttleworth, 1840 accepted as Chlamydomonas Ehrenberg, 1833 (source of synonymy)
Halotia D.B. Genuário, M.G.M.V. Vaz, G.S. Hentschke, C.L. Sant'Anna & M.F. Fiore, 2015 (verified source for family)
Herposteiron Nägeli, 1849 accepted as Aphanochaete Braun, 1851 (source of synonymy)
Heteroscytonema G.B. McGregor & B.C. Sendall in Sendall & McGregor, 2018 (verified source for family)
Heteroscytonemataceae G.B. McGregor & B.C. Sendall in Sendall & McGregor, 2018 (current name source)
Holopedia Lagerheim, 1893 accepted as Microcrocis P. Richter in F. Hauck & P. Richter, 1892 (source of synonymy)
Ikella V.P. Shuysky, 1970 † (verified source for family)
Inacoccus W.A. Gama, J. Rigonato, M.F. Flore & C.L. Sant'Anna, 2019 (verified source for family)
Iningainema G.B. McGregor & B.C. Sendall, 2017 (verified source for family)
Jkella V.P. Shuysky, 1970 † accepted as Ikella V.P. Shuysky, 1970 † (source of synonymy)
Kallymeniopsis Perestenko ex A.V. Skriptsova, S.Y. Shibneva & A.A. Semenchenko, 2023 (basis of record)

 Taxonomic remark

 for Chlamydomonadales

Name used in preference to Volvocales in Ruggiero et al., 2015, also in current use in WoRMS (2017) and AlgaeBase ... [details]

 Taxonomic remark

 for Chlorolilaea U. Lortou & S. Gkelis in Gkelis, 2023

Nomen novum for Lilaea Lortou & Gkelis, 2022, non Lilaea Bonpland in Humboldt & Bonpland, 1808 (Magnolipsida). [details]

 Taxonomic remark

 for Ikella V.P. Shuysky, 1970 †

Original orthography ("Jkella") not in use, Ikella found in current literature and AlgaeBase for this taxon. [details]

 Taxonomic remark

 for Jkella V.P. Shuysky, 1970 †

This orthography not in use, see Ikella as per AlgaeBase (2025 version) and current literature. [details]

 Taxonomic remark

 for Kallymeniopsis Perestenko ex A.V. Skriptsova, S.Y. Shibneva & A.A. Semenchenko, 2023

Initially published as Kallymeniopsis Perestenko, 1977 which is unavailable (no type designated); subsequent ... [details]

 Taxonomic remark

 for Kallymeniopsis Perestenko, 1977

Unavailable name (no type designated); subsequent validation attempt by Perestenko, 1977 unsuccessful (no full and ... [details]

 Taxonomic remark

 for Mammillaria Stackhouse, 1809

nom. rej. vs. Mammillaria Haworth 1812 (nom. cons.) (Index Nominum Genericorum). From AlgaeBase, 2025 version: ... [details]

 Taxonomic remark

 for Volvocales

AlgaeBase (2025) now uses Volvocales for this taxon, previously used Chlamydomonadales (e.g. per Ruggiero et al., 2015). [details]