(Redirected from Protista taxonomy)
Classification of eukaryotes
A modern non-hierarchical interpretation of the phylogeny of eukaryotes, including protists
(the gray unlabeled line next to Sar represents Telonemia)
A protist (/ˈproʊtɪst/) is any eukaryotic organism (one with cells containing a nucleus) that is not an animal, plant, or fungus. The protists do not form a natural group, or clade, since they exclude certain eukaryotes with whom they share a common ancestor; but, like algae or invertebrates, the grouping is used for convenience. In some systems of biological classification, such as the popular five-kingdom scheme proposed by Robert Whittaker in 1969, the protists make up a kingdom called Protista, composed of "organisms which are unicellular or unicellular-colonial and which form no tissues". In the 21st century, the classification shifted toward a two-kingdom system of protists: Chromista (containing the chromalveolate, rhizarian and hacrobian groups) and Protozoa (containing excavates and all protists more closely related to animals and fungi).
The following groups contain protists. The clade Opisthokonta also contains the animals and the fungi, and the kingdom Archaeplastida also contains algae and plants.
Symbols and abbreviations used:
- nom. cons. — Indicates a conserved name, a name which has been chosen for a taxon despite not being the priority name.
- ICZN/ICN — Indicates an ambiregnal taxon that is accepted in both the zoological and the botanical codes of nomenclature, regulated by the ICZN and the ICN respectively.
- (P) — Indicates a paraphyletic taxon.
- † — Indicates an extinct taxon.
- ? — Indicates a taxon of uncertain taxonomic position, which may be the case for various reasons, including a lack of genetic data.
- → — Indicates a monotypic relationship.
Current classification
This article largely follows the efforts of the scientific community and the International Society of Protistologists to revise the taxonomy of protists in a manner that reflects their phylogeny and evolution, striving away from the use of historical paraphyletic taxa and relying exclusively on clades as the basis of the classification. The reference used for the general arrangement of groups is the publication Revisions to the Classification, Nomenclature and Diversity of Eukaryotes, published in 2019 by researcher Sina Adl and coauthors. Other studies are used for some specific groups of protists that have been revised after 2018, such as slime moulds, glaucophyte algae, arcellinid testate amoebae and planktonic foraminifera. The usage of higher-level taxon ranks (phylum and kingdom) is unstable, as it varies from one author to the next; as such, said ranks are generally ommitted.
The following cladogram shows the relationships between the major groups of protists, as well as the kingdoms of animals, plants and fungi, according to the most recent phylogenetic analyses.
Obazoa Brown et al. 2013
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Cladogram of Obazoa based on several analyses. It includes the earliest diverging 'fungi' (microsporidians, aphelids and rozellids), which are only sometimes considered protists under the name of Opisthosporidia.
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Opisthokonta Cavalier-Smith 1987 emend. Adl et al. 2005
- Nucletmycea Brown et al. 2009 (=Holomycota Liu et al. 2009)
- Holozoa Lang et al. 2002. Incertae sedis genera: Tunicaraptor Tikhonenkov, Mikhailov, Hehenberger, Karpov, Prokina, Esaulov, Belyakova, Mazei, Mylnikov, Aleoshin & Keeling 2020; †Bicellum Strother & Wellman 2021.
- Class Ichthyosporea Cavalier-Smith 1998 (=Mesomycetozoea Mendoza et al. 2002)
- Order Dermocystida Cavalier-Smith 1998 → family Rhinosporidaceae Mendoza et al. 2001. Genera: Amphibiocystidium Pascolini et al. 2003; Amphibiothecum Feldman, Wimsatt & Green 2005; Chromosphaera Grau-Bové et al. 2017; Dermocystidium Pérez 1908; Rhinosporidium Minchin & Fantham 1905; Sphaerothecum Arkush et al. 2003, Valentines Borteiro et al. 2018.
- Order Ichthyophonida Cavalier-Smith 1998 (=Ichthyophonae Mendoza et al. 2001) → family Amoebidiidae Reeves 2003. Genera: Abeoforma, Amoebidium, Anurofeca, Astreptonema, Caullerya, Creolimax, Eccrinidus, Enterobryus, Enteropogon, Ichthyophonus, Palavascia, Pseudoperkinsus, Psorospermium, Sphaeroforma.
- Class Pluriformea Hehenberger et al. 2017 → order Corallochytrida Cavalier-Smith 1995 emend. 2021
- Class Filasterea Shalchian-Tabrizi et al. 2008 → order Ministeriida Cavalier-Smith 1997. Genera (not assigned to families): Pigoraptor Tikhonenkov et al. 2017; Txikispora Urrutia et al. 2022.
- Choanozoa Brunet & King 2017
- Class Choanoflagellata Kent 1880–1882 (=Craspedomonadina Stein 1878, Craspedomonadaceae Senn 1900, Craspedophyceae Chadefaud 1960, Craspédomonadophycidées Bourrelly 1968, Craspedomonadophyceae Hibberd 1976, Choanomonadea Krylov et al. 1980, Choanoflagelliida Lee, Hutner & Bovee 1985, Choanoflagellatea Cavalier-Smith 1997 emend. Cavalier-Smith 1998, Choanomonada Adl et al. 2005)
- Order Craspedida Cavalier-Smith 1997, emend. Nitsche et al. 2011 → family Salpingoecidae Kent 1880–1882, emend. sensu Nitsche et al. 2011 (=Codonosigidae Kent 1880–1882). Genera: Astrosiga Kent 1878; Aulomonas Lackey 1942; Barroeca Hake, Burkhardt, Richter & King 2024; Choanoeca Ellis 1930, Cladospongia M.O.P.Iyengar & K.R.Ramanathan 1940; Codonocladium Stein 1878; Codonosigopsis Senn 1900, Codosiga James-Clark 1866 (=Codonosiga Stein 1878); Desmarella Kent 1878 (=Codonodesmus Stein 1878, Kentrosiga Schiller 1953); Dicraspedella Ellis 1930; Diploeca Ellis 1930; Diplosiga Frenzel 1892; Diplosigopsis Francé 1897; Hartaetosiga Carr, Richter & Nitsche 2017; Kentia Schiller 1953; Lagenoeca Kent 1881; Microstomoeca Carr, Richter & Nitsche 2017; Monosiga Kent 1878; Mylnosiga Carr, Richter & Nitsche 2017; Pachysoeca Ellis 1930; Proterospongia Kent 1882; Salpingoeca James-Clark 1866; Salpingorhiza Klug 1936; Sphaeroeca Lauterborn 1894; Stagondoeca Carr, Richter & Nitsche 2017; Stelexomonas Lackey 1942; Stylochromonas Lackey 1940.
- Order Acanthoecida Cavalier-Smith 1997, emend. Nitsche et al. 2011
- Kingdom Metazoa Haeckel 1874, emend. Adl et al. 2005 (=Animalia Linnaeus 1758). Excluded from protists.
Phylum Amoebozoa Lühe 1913, sensu Cavalier-Smith 1998
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Cladogram of Amoebozoa based on an 824-gene phylogenetic analysis published in 2022.
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Class Tubulinea Smirnov et al. 2005
- Corycidia Kang et al. 2017
- Subclass Echinamoebia Cavalier-Smith et al. 2016 → order Echinamoebida Cavalier-Smith et al. 2004 emend. Smirnov et al. 2011
- Elardia Kang et al. 2017
- Subclass Leptomyxia Cavalier-Smith et al. 2016 → order Leptomyxida Pussard & Pons 1976 emend. Page 1987
- Superorder Eulobosia Cavalier-Smith et al. 2016
- Order Arcellinida Kent 1880. Incertae sedis genera: Acipyxis Jung 1942; Apolimia Korganova 1987; Argynnia Vucetich 1974; Armipyxis Dekhtjar 2009; Conicocassis Nasser & Patterson 2015; Cornuapyxis Coûteaux & Chardez 1981; Ellipsopyxella Bonnet 1975; Ellipsopyxis Bonnet 1975; Erugomicula Nasser et al. 2021; Frenopyxis Bobrov & Mazei 2020; Geamphorella Bonnet 1959; Geoplagiopyxis Chardez 1960; Geopyxella Bonnet & Thomas 1955; Hoogenraadia Gauthier-Liévre & Thomas 1958; Jungia Loeblich & Tappan 1961; Lagenodifflugia Medioli & Scott 1983; Lamptopyxis Bonnet 1974; Lamtoquadrula Bonnet 1975; Leptochlamys West 1901; Maghrebia Gauthier-Liévre & Thomas 1958; Meisterfeldia Bobrov 2016; Microquadrula Golemansky 1968; Nabranella Snegovaya & Alekperov 2009; Oopyxis Jung 1942; Paracentropyxis Bonnet 1960; Paraquadrula Deflandre 1932; Pentagonia Gauthier-Liévre & Thomas 1958; Physochila Jung 1942; Planhoogenraadia Bonnet 1977; Pomoriella Golemansky 1970; Pontigulasia Rhumbler 1895; Prantlitina Vašíček & Růžička 1957; Proplagiopyxis Schönborn 1964; Protoplagiopyxis Bonnet 1962; Protocucurbitella Gauthier-Liévre & Thomas 1960; Pseudawerintzewia Bonnet 1959; Pseudonebela Gauthier-Liévre & Thomas 1953; Schoenbornia Decloître 1964; Sexangularia Awerintzew 1906; Suiadifflugia Green 1975; Trigonopyxis Penard 1912; Wailesella Deflandre 1928; †Cangwuella K.Wang et al. 2024.
- Suborder Phryganellina Bovee 1985
- Suborder Organoconcha Lahr et al. 2019 → family Microchlamyiidae Ogden 1985. Genera: Microchlamys Cockerell 1911 (=Pseudochlamys Claparède & Lachmann 1859); Spumochlamys Kudryavtsev & Hausmann 2007; Pyxidicula Ehrenberg 1838.
- Suborder Glutinoconcha Lahr et al. 2019
- Infraorder Volnustoma Lahr et al. 2019 → family Heleoperidae Jung 1942. Genera: Heleopera Leidy 1879; Metaheleopera Bartoš 1963.
- Infraorder Hyalospheniformes Lahr et al. 2019 → family Hyalospheniidae Schultze 1877 emend. Kosakyan et al. 2012. Genera: Alabasta Duckert, Blandenier, Kosakyan & Singer 2018; Alocodera Jung 1942; Apodera Loeblich & Tappan 1961; Certesella Loeblich & Tappan; Cornutheca Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara 2016; Gibbocarina Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara 2016; Hyalosphenia (Stein 1857) Schulze 1877; Longinebela Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara 2016; Mrabella Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara 2016; Nebela Leidy 1874 emend. Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara 2016; Padaungiella Lara & Todorov 2012; Planocarina Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara 2016; Porosia Jung 1942 emend. Bobrov & Kosakyan 2015; Quadrulella Cockerell 1909 emend. Kosakyan, Lahr, Mulot, Meisterfeld, Mitchell & Lara 2016.
- Infraorder Excentrostoma Lahr et al. 2019 → family Centropyxidae Jung 1942 (includes Plagiopyxidae Bonnet & Thomas 1960). Genera: Awerinzewia Schouteden 1906; Bullinularia Deflandre 1953; Centropyxis Stein 1859; Frenopyxis Bobrov & Mazei 2020; Golemanskia González-Miguéns, Todorov, Blandenier, Porfirio-Sousa, Ribeiro, Ramos, Lahr & Lara 2022; Plagiopyxis Penard 1910.
- Infraorder Cylindrothecina González-Miguéns, Todorov, Blandenier, Porfirio-Sousa, Ribeiro, Ramos, Lahr & Lara 2022 → family Cylindrifflugiidae González-Miguéns, Todorov, Blandenier, Porfirio-Sousa, Ribeiro, Ramos, Lahr & Lara 2022. Sole genus: Cylindrifflugia González-Miguéns, Todorov, Blandenier, Porfirio-Sousa, Ribeiro, Ramos, Lahr & Lara 2022.
- Infraorder Longithecina Lahr et al. 2019
- Infraorder Sphaerothecina Kosakyan, Lara & Lahr 2016
- Order Euamoebida Lepşi 1960 sensu Smirnov et al. 2011
- Suborder Amoebina Cavalier-Smith 2016
- Family Amoebidae Ehrenberg 1838 Page 1987. Genera: Amoeba, Chaos, Polychaos, Parachaos, Trichamoeba, Deuteramoeba, Hydramoeba
- Family Hartmannellidae Volkonsky 1931. Cashia, Copromyxa, Copromyxella, Glaeseria, Hartmannella, Ptolemeba, Saccamoeba
- Suborder Nolandina Cavalier-Smith 2016 → family Nolandellidae Cavalier-Smith 2011, Lahr & Katz 2011. Sole genus: Nolandella.
Evosea Kang et al. 2017
- Class Cutosea Cavalier-Smith 2016 → order Squamocutida Cavalier-Smith 2016
- Class Variosea Cavalier-Smith 2004
- Class Archamoebea Cavalier-Smith 1983, sensu Cavalier-Smith 2004
- Superclass Eumycetozoa Zopf 1884 sensu Kang et al. 2017 (=Mycetozoa de Bary 1859 ex Rostafinski 1873, Macromycetozoa Fiore-Donno 2010)
- Class Dictyostelea Lister 1909 sensu Sheikh et al. 2018/Dictyosteliomycetes Doweld 2001. Genus unassigned to an order: Synstelium S.Baldauf S.Sheikh & Thulin 2018. Incertae sedis genus: Coenonia Tiegh. 1884.
- Class Ceratiomyxea/Ceratiomyxomycetes D. Hawksw., B. Sutton & Ainsw. 2019 → order Protosporangiida Shadwick & Spiegel in Adl et al. 2012/Ceratiomyxales G.W. Martin ex M.L. Farr & Alexop.
- Class Myxogastrea Cavalier-Smith 1993/Myxomycetes G.Winter 1880 (=Myxogastres Fr. 1829, Myxogasteres Schröt., 1889, Endosporeae Rostaf. 1873, Myxogastromycetidae G.W.Martin 1961, Myxogastromycetes M.Locquin 1974, Myxogastria Cavalier-Smith 2012 as "Myxogastria L.S.Olive 1970" nom. inval.)
- Subclass Lucisporinia Cavalier-Smith 2013 as "Lucisporidia"/Lucisporomycetidae Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019. Incertae sedis genera: Arcyriatella Hochg. & Gottsb. 1989; Calonema Morgan 1893; Minakatella G.Lister 1921; Trichioides Novozh., Hoof & Jagers 2015.
- Superorder Cribariidia Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019 → order Cribariida/Cribariales T.Macbr. 1922 → family Cribariidae/Cribariaceae Corda 1838. Genera: Cribaria Pers. 1794; Lindbladia Fr. 1849; Licaethalium Rostaf. 1873.
- Superorder Trichiidia Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019
- Order Reticulariida/Reticulariales Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019 → family Reticulariidae/Reticulariaceae Chevall. ex Corda 1842. Genera: Alwisia Berk. & Broome 1873 emend. Leontyev, Schnittler, G.Moreno, S.L.Stephenson, D.W.Mitchell & C.Rojas 2014; Lycogala Adans. 1763; Reticularia Bull. 1787–1788; Tubifera J.F.Gmel. 1792 emend. Lentyev, Schnittler & S.L.Stephenson 2015.
- Order Liceida/Liceales E. Jahn 1928 → family Liceidae/Liceaceae Chevall. 1826. Genera: Licea Schrad. 1797; Listerella E.Jahn 1907.
- Order Trichiida/Trichiales T.Macbr. 1922
- Subclass Columellinia Cavalier-Smith 2013 as "Columellidia"/Columellomycetidae Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019 (=Fuscisporidia Cavalier-Smith 2013 sensu Kretzschmar et al. 2015). Incertae sedis genera: Diachea Fr. 1825; Echinosteliopsis Reinhardt & L.S.Olive 1967; Leptoderma G.Lister 1913; Paradiachea Hertel 1956; Protophysarum M.Blackw. & Alexop. 1975; Trabrooksia H.W.Keller 1980; Willkommlangea Kuntze 1891.
- Superorder Echinosteliidia Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019 → order Echinosteliida/Echinosteliales G. W. Martin 1961 → family Echinosteliidae/Echinosteliaceae Rostaf. ex Cooke 1877. Genera: Barbeyella Meyl. 1914; Echinostelium de Bary in Rostafiński 1873 (includes Semimorula E.F.Haskins, McGuinn & C.S.Berry 1983).
- Superorder Stemonitidia Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019 (=Fuscisporidia Cavalier-Smith 2013 non sensu Kretzschmar et al. 2016)
- Order Clastodermatida/Clastodermatales Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019 → family Clastodermatidae/Clastodermataceae Alexop. & T.E. Brooks 1971. Sole genus: Clastoderma A.Blytt 1880.
- Order Meridermatida/Meridermatales Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019 → family Meridermatidae/Meridermataceae Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019. Sole genus: Meriderma Mar.Mey. & Poulain in Poulain, Meyer & Bozonnet 2011.
- Order Stemonitida/Stemonitidales T.Macbr. 1922 as "Stemonitales" emend. Leontyev, Schnittler, S.L.Stephenson, Novozhilov & Shchepin 2019
- Order Physarida/Physarales T.Macbr. 1922. Genus not assigned to a family: Tasmaniomyxa Lloyd et al. 2023.
Class Discosea Cavalier-Smith et al. 2004 sensu Smirnov et al. 2011
- Subclass Flabellinia Smirnov et al. 2005. Incertae sedis genera: Microglomus Olive & Stoianovitch 1977; Mycamoeba Blandenier, Seppey, Singer, Vlimant, Simon, Duckert & Lara 2016.
- Subclass Centramoebia Cavalier-Smith et al. 2016
- Order Microhelida Cavalier-Smith & Chao in Yabuki et al. 2012 → family Microheliellidae Cavalier-Smith & Chao in Yabuki et al. 2012. Sole genus: Microheliella Cavalier-Smith & Chao in Yabuki et al. 2012.
- Phylum Telonemia Shalchian-Tabrizi 2006 → class Telonemea Cavalier-Smith 1993 → order Telonemida Cavalier-Smith 1993 → family Telonemidae Cavalier-Smith 1993. Genera: Arpakorses Tikhonenkov & Karpov 2022; Lateronema Cavalier-Smith 2015; Telonema Griessmann 1913.
- Division Glaucophyta Skuja 1954 (=Glaucocystaceae West 1904, Glaucocystophyta Kies and Kremer 1986, Glaucoplantae Marin & Melkonian in Li et al. 2020). Incertae sedis genera: Archaeopsis, Chalarodora, Glaucocystopsis, Peliaina, Strobilomonas.
- Phylum Picozoa Seenivasan, Sausen, Medlin & Melkonian 2013 (=picobiliphytes Not et al. 2007) → class Picomonadea Seenivasan, Sausen, Medlin & Melkonian 2013 → order Picomonadida Seenivasan, Sausen, Medlin & Melkonian 2013 → family Picomonadidae Seenivasan, Sausen, Medlin & Melkonian 2013. Sole genus: Picomonas Seenivasan, Sausen, Medlin & Melkonian 2013.
- Phylum Rhodelphidia Tikhonenkov, Gawryluk, Mylnikov & Keeling 2019 → class Rhodelphidea Tikhonenkov, Gawryluk, Mylnikov & Keeling 2019 → order Rhodelphida Tikhonenkov, Gawryluk, Mylnikov & Keeling 2019 → family Rhodelphidae Tikhonenkov, Gawryluk, Mylnikov & Keeling 2019. Sole genus: Rhodelphis Tikhonenkov, Gawryluk, Mylnikov & Keeling 2019.
- Division Rhodophyta Wettstein 1901 (=Rhodophyceae Thuret 1855, emend. Rabenhorst 1863, Rhodoplantae Saunders and Hommersand 2004 emend. Adl et al. 2005)
- Division Prasinodermophyta Marin & Melkonian in Li et al. 2020
- Class Prasinodermophyceae Marin & Melkonian in Li et al. 2020 → order Prasinodermales Marin & Melkonian in Li et al. 2020 → family Prasinodermaceae Marin & Melkonian in Li et al. 2020. Sole genus: Prasinoderma Hasegawa & Chihara in Hasegawa et al. 1996.
- Class Palmophyllophyceae Leliaert et al. 2016 emend. Marin & Melkonian in Li et al. 2020
- Order Palmophyllales Zechman, Verbruggen, Leliaert, Ashwort, M.A.Buchheim, Fawley, H.Spalding, Pueschel, J.A.Buschheim, Verghese & Hanisak 2010 → family Palmophyllaceae Zechman, Verbruggen, Leliaert, Ashwort, M.A.Buchheim, Fawley, H.Spalding, Pueschel, J.A.Buschheim, Verghese & Hanisak 2010. Genera: Palmophyllum Kützing 1849; Verdigellas Ballantine & Norris 1994; Palmoclathrus Womersley 1971.
- Order Prasinococcales Guillou et al. ex Leliaert et al. 2016 emend. Marin & Melkonian in Li et al. 2020 → family Prasinococcaceae Leliaert et al. 2016. Sole genus: Prasinococcus Miyashita & Chihara in Miyashita et al. 1993.
- Division Chlorophyta Reichenbach 1828 emend. Pascher 1914 emend. Lewis & McCourt 2004
- Class Chloropicophyceae Lopes dos Santos & Eikrem 2017 → order Chloropicales Lopes dos Santos & Eikrem 2017 → family Chloropicaceae Lopes dos Santos & Eikrem 2017. Genera: Chloroparvula Lopes dos Santos & Eikrem 2017; Chloropicon Lopes dos Santos & Eikrem 2017.
- Class Mamiellophyceae Marin & Melkonian 2010
- Order Mamiellales Moestrup 1984 emend. Marin & Melkonian 2010
- Order Dolichomastigales Marin & Melkonian 2010
- Order Monomastigales R.E.Norris ex Marin & Melkonian 2010 (=Monomastigales Norris in Parker 1982 nomen nudum) → family Monomastigaceae Marin & Melkonian 2010. Sole genus: Monomastix Scherffel 1912.
- Class Nephroselmidophyceae Cavalier-Smith 1993 emend. Yamaguchi 2011 → order Nephroselmidales Nakayama, Suda, Kawachi & Inouye 2007 → family Nephroselmidaceae Pascher 1913 ex Silva 1980. Genera: Nephroselmis Stein 1878.
- Class Picocystophyceae Lopes dos Santos & Eikrem 2017 → order Picocystales Lopes dos Santos & Eikrem 2017 → family Picocystaceae Lopes dos Santos & Eikrem 2017. Sole genus: Picocystis R.A.Lewin in Lewin et al. 2000.
- Class Pseudoscourfieldiophyceae Crépeault, C.Otis, Pombert, Turmel & Lemieu 2024 → order Pseudoscourfieldiales Melkonian 1990 ex Crépeault, C.Otis, Pombert, Turmel & Lemieu 2024 → family Pseudoscourfieldiaceae Melkonian 1990 ex Crépeault, C.Otis, Pombert, Turmel & Lemieu 2024 (=Pycnococcaceae Guillard in Guillard, Keller, O'Kelly & Floyd 1991 emend. M.W.Fawley in Fawley et al. 1999. Sole genus: Pseudoscourfieldia Manton 1975 (=Pycnococcus Guillard in Guillard, Keller, O'Kelly & Floyd 1991).
- Class Pyramimonadophyceae Moestrup & Daugbjerg in Daugbjerg et al. 2020 → order Pyramimonadales Chadefaud 1950
- Core Chlorophyta
- Class Chlorodendrophyceae Massjuk 2006 → order Chlorodendrales Berger 1954 as "Chlorodendrinales" (=Tetraselmidales Ettl. 1982) → family Chlorodendraceae Oltmanns 1904. Genera: Prasinocladus Kuckuck 1894; Scherffelia Pascher 1912; Tetraselmis Stein 1878.
- Class Pedinophyceae Moestrup 1991 emend. Fawley, Zechman & Buchheim in Adl et al. 2012
- UTC clade
- Class Chlorophyceae Wille 1884
- SV clade
- Order Sphaeropleales Luerssen 1877. Incertae sedis genera: Spermatozopsis Korshikov 1913; Golenkinia Chodat 1894; Jenufa Němcová, M.Eliáš, Škaloud & Neustupa 2011; Johansenicoccus.
- Family Dictyochloridaceae Fučíková, P.O.Lewis & L.A.Lewis 2013. Sole genus: Dictyochloris Vischer 1945.
- Family Sphaeropleaceae Kützing 1849
- Family Microsporaceae Bohlin 1901
- Treubarinia. Genera: Trochiscia Kützing 1834; Treubaria C.Bernard 1908; Cylindrocapsa Reinsch 1867; Elakatothrix Wille 1898.
- Scenedesminia ("traditional" Sphaeropleales)
- Family Bracteacoccaceae P.M.Tsarenko 2005. Sole genus: Bracteacoccus Tereg 1922.
- Family Bracteamorphaceae Fučíková, P.O.Lewis & L.A.Lewis 2013. Sole genus: Bracteamorpha Fučíková, P.O.Lewis & L.A.Lewis 2013.
- Family Chromochloridaceae Fučíková, P.O.Lewis & L.A.Lewis 2013. Sole genus: Chromochloris Kol & Chodat 1934.
- Family Dictyococcaceae Fučíková, P.O.Lewis & L.A.Lewis 2013. Sole genus: Dictyococcus Gerneck 1907.
- Family Hydrodictyaceae Dumortier 1829. Genera: Hydrodictyon Roth; Lacunastrum H.A.McManus; Monactinus Corda; Parapediastrum E.Hegewald; Pediastrum Meyen.
- Family Mychonastaceae Fučíková, P.O.Lewis & L.A.Lewis 2013. Sole genus: Mychonastes P.D.Simpson & S.D.Van Valkenburg 1978.
- Family Neochloridaceae Ettl & Komárek 1982
- Family Pseudomuriellaceae Fučíková, P.O.Lewis & L.A.Lewis 2013. Sole genus: Pseudomuriella N.Hanagata 1998.
- Family Scenedesmaceae Oltmanns 1904
- Family Schizochlamydaceae Fučíková, P.O.Lewis & L.A.Lewis 2013. Sole genus: Schizochlamys Braun ex Kützing 1849.
- Family Selenastraceae Blackman & Tansley 1903 (=Ankistrodesmaceae Korshikov 1953)
- Family Radiococcaceae
- Family Rotundellaceae Fučíková, P.O.Lewis & L.A.Lewis 2013. Sole genus: Rotundella Fučíková, P.O.Lewis & L.A.Lewis 2013.
- Family Tumidellaceae Fučíková, P.O.Lewis & L.A.Lewis 2013. Sole genus: Tumidella Fučíková, P.O.Lewis & L.A.Lewis 2013.
- Order Volvocales Poche 1913
- OCC clade
- Class Trebouxiophyceae Friedl 1995 (=Pleurastrophyceae Mattox et al. 1984)
- Class Ulvophyceae
- Division Streptophyta Bremer & Wanntorp 1981 (=Charophyta Migula 1897 emend. Karol et al. 2009)
Stramenopiles Patterson 1989, emend. Adl et al. 2005
- Class Platysulcea Cavalier-Smith 2018 → order Platysulcida Cavalier-Smith 2018 → family Platysulcidae Shiratori, Nakayama & Ishida 2015. Sole genus: Platysulcus Shiratori, Nakayama & Ishida 2015.
- Family Kaonashiidae Weston, Eglit & Simpson 2023. Sole genus: Kaonashia Weston, Eglit & Simpson 2023.
Phylum Bigyra Cavalier-Smith 1998 emend. 2006
- Subphylum Opalozoa Cavalier Smith 1991 emend. 2006
- Infraphylum Placidozoa Cavalier-Smith 2013
- Class Placididea Moriya, Nakayama & Inouye 2002 → order Placidida Moriya, Nakayama & Inouye 2002 → family Placididae Moriya, Nakayama & Inouye 2002. Genera: Allegra Rybarski & Arndt 2021; Haloplacidia Rybarski, Nitsche & Arndt 2021; Pendulomonas S.M.Tong 1997; Placidia Moriya, Nakayama & Inouye 2002; Placilonga Rybarski & Arndt 2021; Suigetsumonas Okamura & Kondo 2015; Wobblia Moriya, Nakayama & Inouye 2000.
- Class Nanomonadea Cavalier-Smith in Cavalier-Smith & Scoble 2013 (=clade MAST-3) → order Uniciliatida Cavalier-Smith in Cavalier-Smith & Scoble 2013
- Class Opalomonadea Cavalier-Smith 2013 (=clade MAST-12). No described species.
- Superclass Opalinata Wenyon 1926 emend. Cavalier-Smith 1997
- Class Opalinea Wenyon 1926 (=Slopalinida Patterson 1985)
- Order Proteromonadida Grassé 1952 emend. Cavalier-Smith 1993 → family Proteromonadidae Grassé 1952. Sole genus: Proteromonas Kunstler 1883 (= Prowazekella Aléxéieff 1912).
- Order Opalinida Poche 1913 stat. nov. Hall 1953 emend. Cavalier-Smith
- Class Blastocystea Zierdt et al. 1967 → order Blastocystida Zierdt 1978 → family Blastocystidae Jiang & He 1988. Sole genus: Blastocystis Alexeieff 1911.
- Infraphylum Bikosea Cavalier-Smith 2018 (=Bicosoecida Grassé 1926 emend. Karpov 1998) → class Bikosea Cavalier-Smith 1986 as "Bicosoecea" orth. em. 2013. Genera not assigned to families: Bilabrum Schoenle & Arndt in Schoenle et al. 2020; Cafileria Jirsová, Füssy, Richtová, Gruber, & Oborník 2019; Cantina Yubuki et al. 2015.
- Family Pseudobodonidae Cavalier-Smith in Cavalier-Smith & Scoble 2013. Sole genus: Pseudobodo Griessmann 1913.
- Subclass Rictidia Cavalier-Smith in Cavalier-Smith & Scoble 2013 → order Rictida Cavalier-Smith in Cavalier-Smith & Scoble 2013 → family Rictidae Cavalier-Smith in Cavalier-Smith & Scoble 2013. Sole genus: Rictus Yubuki, Leander & Silberman 2010.
- Subclass Bicosidia/Bicosoecophycidae Cavalier-Smith in Cavalier-Smith & Chao 2006
- Superorder Borokiae Cavalier-Smith in Cavalier-Smith & Chao 2006 → order Borokida/Borokales Cavalier-Smith in Cavalier-Smith & Chao 2006 → family Borokidae/Borokaceae Cavalier-Smith in Cavalier-Smith & Chao 2006. Sole genus: Boroka Cavalier-Smith in Cavalier-Smith & Chao 2006.
- Superorder Cyathobodoniae Cavalier-Smith 1993 emend. 2006. Incertae sedis genus: Halocafeteria Park, Cho & Simpson 2006.
- Order Anoecida/Anoecales Cavalier-Smith 1997
- Family Anoecidae/Anoecaceae Cavalier-Smith in Cavalier-Smith & Chao 2006. Sole genus: Anoeca Cavalier-Smith in Cavalier-Smith & Chao 2006.
- Family Caecitellidae/Caecitellaceae Cavalier-Smith in Cavalier-Smith & Chao 2006. Sole genus: Caecitellus Patterson et al. 1993.
- Family Cafeteriidae/Cafeteriaceae Moestrup 1995. Sole genus: Cafeteria Fenchel & Patterson 1988.
- Family Symbiomonadaceae Cavalier-Smith in Cavalier-Smith & Chao 2006. Sole genus: Symbiomonas Guillou & Chretiennot-Dinet 1999.
- Order Bicoecida/Bicoecales Grassé 1926
- Order Pseudodendromonadida/Pseudodendromonadales Hibberd 1985 emend. Cavalier-Smith 2006.
- Family Pseudodendromonadidae/Pseudodendromonadaceae Karpov 2000. Genera: Cyathobodo Petersen & Hansen 1961; Pseudodendromonas Bourrelly 1953.
- Family Siluaniidae/Siluaniaceae Karpov 1998. Genera: Adriamonas Verhagen, Zölffel, Brugerolle & D.J.Patterson 1994; Siluania Karpov 1998; Otto Harder, Ekelund & Karpov 2014; Regin Harder, Ekelund & Karpov 2014.
- Family Paramonadidae/Paramonadaceae Kent 1880. Sole genus: Paramonas Kent 1881.
- Family Nanidae/Nanaceae Cavalier-Smith in Cavalier-Smith & Scoble 2013. Sole genus: Nanum Kim et al. 2010 as "Nanos".
- Family Neradidae/Neradaceae Cavalier-Smith in Cavalier-Smith & Chao 2006. Sole genus: Nerada Cavalier-Smith in Cavalier-Smith & Chao 2006.
- Family Filidae/Filaceae Cavalier-Smith in Cavalier-Smith & Scoble 2013. Sole genus: Filos Kim et al. 2010.
- Subphylum Sagenista Cavalier-Smith 1995
- Class Labyrinthulomycetes Arx 1970 ex Dick 2001 (=Labyrinthulea L.S.Olive 1975 ex Cavalier-Smith 1989, 'phylum' Labyrinthomorpha Page in Levine et al. 1980/Labyrinthulomycota Whittaker 1969)
- Order Amphitremida (Poche 1913) Gomaa et al. 2013
- Order Amphifilida Cavalier-Smith in Anderson & Cavalier-Smith 2012 as "Amphifiloidea"
- Family Amphifilidae Cavalier-Smith in Anderson & Cavalier-Smith 2012. Sole genus: Amphifila Cavalier-Smith in Anderson & Cavalier-Smith 2012.
- Family Sorodiplophryidae Cavalier-Smith in Anderson & Cavalier-Smith 2012. Genera: Fibrophrys Takahashi, Yoshida, Inouye & Watanabe 2016; Sorodiplophrys Cienkowski 1876.
- Order Oblongichytrida/Oblongichytriales Bennett et al. 2017 → family Oblongichytriidae/Oblongichytriaceae Cavalier-Smith in Anderson & Cavalier-Smith 2012. Sole genus: Oblongichytrium R.Yokoyama & D.Honda 2006.
- Order Labyrinthulida Doffein 1901/Labyrinthulales E.A.Bessey 1950
- Family Aplanochytriidae/Aplanochytriaceae Leander ex Cavalier-Smith in Anderson & Cavalier-Smith 2012. Sole genus: Aplanochytrium Bahnweg & Sparrow 1972 emend. C.A.Leander & D.Porter 2000 (=Labyrinthuloides F.O.Perkins 1973).
- Family Labyrinthulidae Cienkowski 1867/Labyrinthulaceae Haeckel 1868. Sole genus: Labyrinthula Cienkowski 1864 (=Chlamydomyxa Archer 1875, Pseudoplasmodium Molisch 1926, Labyrinthodictyon Valkanov 1969, Labyrinthorhiza Chadefaud 1956).
- Family-level clade "Stellarchytriidae/Stellarchytriaceae". Sole genus: Stellarchytrium FioRito & Leander 2016.
- Order Thraustochytrida/Thraustochytriales Sparrow 1943
- Class Eogyrea Cavalier-Smith 2013 (=clade MAST-6). Genera not assigned to families: Mastreximonas Lax, Cho & Keeling 2024; Vomastromonas Tikhonenkov, Prokina, Cho & Keeling 2024.
- Order Eogyrida Cavalier-Smith 2018 → family Pseudophyllomitidae/Pseudophyllomitaceae Shiratori et al. 2017. Sole genus: Pseudophyllomitus Lee 2002.
Phylum Gyrista Cavalier-Smith 1998
- Subphylum Bigyromonada Cavalier-Smith 1998
- Class Developea Karpov & Aleoshin 2016 ex Cavalier-Smith 2017 → order Developayellida Cavalier-Smith 1987 ex 2017/Developayellales Doweld 2001 → family Developayellidae/Developayellaceae Cavalier-Smith 1997 ex 2017. Genera: Cubaremonas Tikhonenkov, Cho & Keeling 2022; Develocanicus Tikhonenkov, Cho, Mylnikov & Keeling 2022; Develocauda Tikhonenkov, Cho & Keeling 2022; Developayella Tong 1995; Develorapax Karpov & Aleoshin 2016; Mediocremonas del Campo & Weiler 2020.
- Class Pirsonea Cavalier-Smith 2017 → order Pirsoniales Cavalier-Smith 1998 emend. Prokina et al. 2024 → Pirsoniaceae Cavalier-Smith 1998 emend. Prokina et al. 2024. Genera: Bordeauxia Prokina et al. 2024; Bullionia Prokina et al. 2024; Feodosia Prokina et al. 2024; Koktebelia Prokina et al. 2024; Noirmoutieria Prokina et al. 2024; Pirsonia Schnepf, Debres & Elbrachter 1990.
- Subphylum Pseudofungi Cavalier-Smith 1986 (=Heterokontimycotina M.W. Dick 1976, Peronosporomycotina M.W.Dick 2001)
- Subphylum/Division Ochrophyta Cavalier-Smith 1986, emend. Cavalier-Smith & Chao 1996 (=Heterokontophyta Guiry, R.A.Andersen & Moestrup 2023). Incertae sedis genera: Commation Thomsen & Larsen 1993.
- Order Actinophryida Claus 1874, emend. Hartmann 1926
- Suborder Actinosphaerina Cavalier-Smith 2013 → family Actinosphaeriidae Cavalier-Smith 2013. Sole genus: Actinosphaerium Ritter von Stein 1857 (=Echinosphaerium Hovasse 1965).
- Suborder Actinophryina Cavalier-Smith 2013
- Family Actinophryidae Dujardin 1841. Sole genus: Actinophrys Ehrenberg 1830 (=Trichoda Müller 1773 nomen oblitum, Peritricha Bory de St.Vincent 1824 nomen dubium).
- Family Helioraphidae Cavalier-Smith 2013. Sole genus: Heliorapha Cavalier-Smith 2013.
- Infraphylum Chrysista Cavalier-Smith 1986. Incertae sedis genera: Chrysoderma C.Billard 1984 nom. inval.; Chrysomeris Carter 1937; Chrysonephos W.R.Taylor 1952; "Giraudyopsis" Dangeard 1965 nom. inval.; Rhamnochrysis Wilce & Markey 1974.
- Class Eustigmatophyceae Hibberd & Leedale 1971
- Clade Goniochloridales K.P.Fawley, M.Eliáš & M.W.Fawley 2013. Genera: Goniochloris Geitler 1928; Pseudostaurastrum Chodat 1921; Tetraedriella Pascher 1930 nom. cons.; Trachydiscus H.Ettl 1964; Trebonskia Přibyl & Procházková 2022; Vacuoliviride Nakayama, Nakamura, Yokoyama, Shiratori, Inouye & Ishida 2015.
- Order Eustigmatales Hibberd 1981
- Paraeustigmatos M.W.Fawley, Nĕmcová & K.P.Fawley 2019
- Family Eustigmataceae Hibberd 1981. Genera: Ellipsoidion Pascher 1938; Chlorobotrys Bohlin 1901; Eustigmatos Hibberd 1981; Pseudocharaciopsis K.W.Lee & Bold 1973; Vischeria Pascher 1938.
- Family Monodopsidaceae Hibberd 1981 (includes Loboceae Hedgewald in Hedgewald, Padisak & Friedl 2007). Genera: Microchloropsis M.W.Fawley, I.Jameson & K.P.Fawley 2015; Monodopsis Hibberd 1981; Nannochloropsis Hibberd 1981; Pseudotetraedriella Hedgewald in Hedgewald, Padisak & Friedl 2007.
- Family Neomonodaceae R.Amaral, K.P.Fawley, Nĕmcová, T.Ševčíková, Lukešová, M.W.Fawley, L.M.A.Santos & M.Eliáš 2020. Genera: Botryochloropsis Preisig & Wilhelm 1989; Characiopsella R.Amaral, K.P.Fawley, Nĕmcová, T.Ševčíková, Lukešová, M.W.Fawley, L.M.A.Santos & M.Eliáš 2020; Munda R.Amaral, K.P.Fawley, Nĕmcová, T.Ševčíková, Lukešová, M.W.Fawley, L.M.A.Santos & M.Eliáš 2020; Neomonodus R.Amaral, K.P.Fawley, Nĕmcová, T.Ševčíková, Lukešová, M.W.Fawley, L.M.A.Santos & M.Eliáš 2020; Pseudellipsoidion (Neustupa & Nĕmcová) Nĕmcová emend. Amaral et al. 2020.
- SII clade
- Class Olisthodiscophyceae Barcytė, Eikrem & M. Eliáš 2021 → order Olisthodiscales Cavalier-Smith 2013 emend. Barcytė, Eikrem & M. Eliáš 2021 → family Olisthodiscaceae Cavalier-Smith 2013 emend. Barcytė, Eikrem & M. Eliáš 2021. Sole genus: Olisthodiscus Carter 1937.
- Class Pinguiophyceae Kawachi, Inouye, Honda, O'Kelly, Bailey, Bidigare & R.A.Andersen 2002 → order Pinguiochrysidales Kawachi, Inouye, Honda, O'Kelly, Bailey, Bidigare & R.A.Andersen 2002 → family Pinguiochrysidaceae Kawachi, Inouye, Honda, O'Kelly, Bailey, Bidigare & R.A.Andersen 2002. Genera: Glossomastix O'Kelly 2002; Phaeomonas Honda & Inouye 2002; Pinguiochrysis Kawachi 2002; Pinguiococcus R.A.Andersen, D.Potter & J.C.Bailey 2002; Polypodochrysis Magne 1975.
- SSC clade
- SI clade/PXR clade
- Class Raphidophyceae Chadefaud 1950 ex Silva 1980 → order Chattonellales Throndsen in Tomas 1993 emend. Yamaguchi, Nakayama, Murakami & Inouye 2010 (=Vacuolariales Shameel, 2001). Genera: Chattonella, Fibrocapsa, Goniostomum, Haramonas, Heterosigma, Merotricha, Vacuolaria.
- PX clade
- Class Chrysoparadoxophyceae Wetherbee in Wetherbee et al. 2019 → order Chrysoparadoxales Wetherbee in Wetherbee et al. 2019 → family Chrysoparadoxaceae Wetherbee in Wetherbee et al. 2019. Genera: Chrysoparadoxa Wetherbee in Wetherbee et al. 2019; Nematochrysis Pascher 1925 (=Chrysowaernella Gayral & Lepailleur 1971).
- Phaeophyceae Hansgirg 1886
- Ascoseirales Petrov 1964. Ascoseira.
- Desmarestiales Setchell & Gardner 1925. Arthrocladia, Desmarestia (P), Himantothallus, Phaeurus.
- Dictyotales Bory de Saint-Vincent 1828. Dictyota, Dilophus, Lobophora, Padina, Stypopodium, Taonia, Zonaria.
- Discosporangiales Kawai et al. 2007. Choristocarpus, Discosporangium.
- Ectocarpales Bessey 1907, emend. Silva & Reviers 2000. Adenocystis, Acinetospora, Asterocladon, Asteronema, Chordaria, Ectocarpus, Scytosiphon.
- Fucales Bory de Saint-Vincent 1927. Ascophyllum, Bifurcaria, Cystoseira, Druvillaea, Fucus, Hormosira, Sargassum, Turbinaria.
- Ishigeales Cho et al. 2004 . Ishige.
- Laminariales Migula 1908. Akkesiophycus, Alaria, Chorda, Costaria, Laminaria, Lessonia, Pseudochoda.
- Nemodermatales Parente et al. 2008. Nemoderma.
- Onslowiales Draisma & Prud'homme van Reine 2008. Onslowia.
- Ralfsiales Nakamura ex Lim & Kawai 2007. Lithoderma, Neoralfsia, Pseudolithoderma, Ralfsia.
- Scytothamnales Peters & Clayton 1998. Scytothamnus, Splachnidium, Stereocladon.
- Sphacelariales Migula 1908. Chaetopteris, Halopteris, Stypocaulon, Sphacelaria, Verosphacella.
- Sporochnales Sauvageau 1926. Bellotia, Carpomitra, Nereia, Sporochonus, Tomaculopsis.
- Syringodermatales Henry 1984. Syringoderma.
- Tilopteridales Bessey 1907. Cutleria, Halosiphon, Haplospora, Phaeosiphoniella, Phyllaria, Tilopteris.
- Class Phaeosacciophyceae R.A.Andersen, L.Graf & H.S.Yoon in Graf et al. 2020 → order Phaeosacciales R.A.Andersen, L.Graf & H.S.Yoon in Graf et al. 2020
- Phaeothamniophyceae Andersen & Bailey in Bailey et al. 1998
- Schizocladiophyceae Henry, Okuda & Kawai 2003. Schizocladia.
- Xanthophyceae Allorge 1930, emend. Fritsch 1935
- Diatomista Derelle et al. 2016, emend. Cavalier-Smith 2017 . Incertae sedis taxa: environmental clades MOCH-1, MOCH-2 and MOCH-4 Massana et al. 2014.
- Bolidophyceae Guillou et al. 1999 . Bolidomonas, Triparma, Tetraparma, Pentalamina.
- Diatomeae Dumortier 1821
- Leptocylindrophytina D.G. Mann, in Adl et al. 2019
- Ellerbeckiophytina D.G. Mann, in Adl et al. 2019. Ellerbeckia.
- Probosciophytina D.G. Mann, in Adl et al. 2019. Proboscia.
- Melosirophytina D.G. Mann, in Adl et al. 2019. Aulacoseira, Melosira, Hyalodiscus, Stephanopyxis, Paralia, Endictya.
- Coscinodiscophytina Medlin & Kaczmarska 2004, emend. Adl et al. 2019. Actinoptychus, Coscinodiscus, Actinocyclus, Asteromphalus, Aulacodiscus, Stellarima.
- Rhizosoleniophytina D.G. Mann, in Adl et al. 2019. Guinardia, Rhizosolenia, Pseudosolenia.
- Arachnoidiscophytina D.G. Mann, in Adl et al. 2019. Arachnoidiscus.
- Bacillariophytina Medlin & Kaczmarska 2004, emend. Adl et al. 2019
- Mediophyceae Jouse & Proshkina-Lavrenko in Medlin & Kaczmarska 2004
- Chaetocerotophycidae Round & R.M. Crawford in Round et al. 1990, emend. Adl et al. 2019. Chaetoceros, Bacteriastrum, Dactyliosolen, Cerataulina, Hemiaulus, Eucampia, Acanthoceras, Urosolenia, Terpsinoë, Hydrosera.
- Lithodesmiophycidae Round & R.M. Crawford in Round et al. 1990, emend. Adl et al. 2019. Lithodesmium, Lithodesmioides, Helicotheca, Bellerochea, Ditylum.
- Thalassiosirophycidae Round & R.M. Crawford in Round et al. 1990. Thalassiosira, Lindavia, Cyclotella, Stephanodiscus, Cyclostephanos, Discostella, Bacteriosira, Skeletonema, Detonula.
- Cymatosirophycidae Round & R.M. Crawford in Round et al. 1990. Cymatosira, Minutocellus, Papiliocellulus, Leyanella, Extubocellulus, Plagiogrammopsis, Campylosira, Brockmanniella, Pierrecomperia.
- Odontellophycidae D. G. Mann, in Adl et al. 2019. Odontella, Triceratium, Cerataulus, Pleurosira, Pseudauliscus, Amphitetras, Trieres, Mastodiscus.
- Chrysanthemodiscophycidae D.G. Mann, in Adl et al. 2019. Chrysanthemodiscus, Biddulphiopsis, Trigonium, Isthmia, Lampriscus, Stictocyclus, Ardissonea, Climacosphenia, Toxarium.
- Biddulphiophyceae D. G. Mann, in Adl et al. 2019
- Bacillariophyceae Haeckel 1878, emend. Adl et al. 2019
- Striatellaceae Kützing 1844. Striatella, Pseudostriatella.
- Urneidophycidae Medlin 2016. (P?) Plagiogramma, Dimeregramma, Rhaphoneis, Delphineis, Psammoneis, Bleakeleya, Asterionellopsis.
- Fragilariophycidae Round in Round, Crawford & Mann 1990, emend. Adl et al. 2019. Fragilaria, Synedra, Tabellaria, Asterionella, Diatoma, Tabularia, Cyclophora, Astrosyne, Licmophora, Rhabdonema, Grammatophora, Staurosira, Thalassionema.
- Bacillariophycidae D.G. Mann in Round, Crawford & Mann 1990, emend. Adl et al. 2019. Eunotia, Achnanthes, Bacillaria, Nitzschia, Pseudonitzschia, Cylindrotheca, Navicula, Seminavis, Haslea, Pleurosigma, Gyrosigma, Achnanthidium, Cocconeis, Frustulia, Diploneis, Sellaphora, Pinnularia, Gomphonema, Cymbella, Didymosphenia, Phaeodactylum, Amphora, Entomoneis, Epithemia, Surirella, etc.
- Dictyochophyceae Silva 1980
- Pelagophyceae Andersen & Saunders 1993
- Pelagomonadales Andersen & Saunders 1993. Aureococcus, Pelagococcus, Pelagomonas.
- Sarcinochrysidales Gayral & Billard 1977
- Sarcinochrysidaceae Gayral & Billard 1977. Ankylochrisis, Arachnochrysis, Aureoscheda, Aureoumbra, Nematochrysopsis, Pelagospilus, Pulvinaria, Sarcinochrysis, Sargassococcus.
- Chrysocystaceae M.Melkonian, H.S.Yoon & R.A.Andersen 2018. Chrysocystis, Chrysoreinhardia, Sungminbooa.
- Plocamiomonadales Daugbjerg & Lovejoy 2024. Plocamiomonas.
Alveolata Cavalier-Smith 1991
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Cladogram of Alveolata, based on a SSU rDNA phylogeny of basal alveolates and a 203-gene phylogeny of apicomplexans and their relatives published in 2023.
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- Colponemida Cavalier-Smith 1993 emend. Adl et al. 2019 (=Protalveolata Cavalier-Smith 1991 emend. 2017. Genera not assigned to families: Neocolponema Gigeroff et al. 2023; Loeffela Gigeroff et al. 2023
- Phylum Colponemidia Tikhonenkov et al. 2014 → class Colponemea Cavalier-Smith 1993 → order Colponemida Cavalier-Smith 1993 → family Colponemidae Cavalier-Smith & Chao 2004. Sole genus: Colponema Stein 1878.
- Phylum Acavomonidia Tikhonenkov et al. 2014 → class Acavomonea Tikhonenkov et al. 2014 → order Acavomonida Tikhonenkov et al. 2014 → family Acavomonidae Tikhonenkov et al. 2014. Acavomonas Tikhonenkov et al. 2014.
- Order Palustrimonadida Cavalier-Smith 2017 → family Palustrimonadidae Cavalier-Smith 2017. Sole genus: Palustrimonas Patterson & Simpson 1996.
Myzozoa Cavalier-Smith & Chao 2004
- Phylum Chromerida R.B.Moore et al. 2008 → class Colpodellophyceae Molinari & Guiry 2023 ("chrompodellids") → order Colpodellales/Colpodellida Cavalier-Smith 1993 emend. Adl et al. 2005, 2019. Incertae sedis genus: Piridium Patten 1936.
- Phylum Perkinsozoa Norén & Moestrup in Norén et al 1999 → class Perkinsea Levine 1978. Incertae sedis genera: Phagodinium Kristiansen 1993; Rastrimonas Brugerolle 2003; Acrocoelus Fernández, Pardos, Benito & Arroyo 1999.
- Maranthos Alacid & Reñé 2021
- Family Pararosariidae Jeon & Park 2021. Sole genus: Pararosarium Jeon & Park 2021.
- Family Parviluciferaceae Reñé & Alacid 2017. Genera: Dinovorax Reñé & Alacid 2017; Parvilucifera Norén & Moestrup 1999; Snorkelia Reñé & Alacid 2017; Tuberlatum Jeon & Park 2019.
- Family Perkinsidae Levine 1978. Sole genus: Perkinsus Levine 1978.
- Family Xcellidae Freeman, Fuss, Kristmundsson, Keeling, Shalchian-Tabrizi & Bass 2017 em. Karlsbakk, Nystøyl, Plarre & Nylund 2021. Genera: Cryoxcellia Evans, Patel, Matzke & Millar 2023, Gadixcellia Freeman, Fuss, Kristmundsson, Keeling, Shalchian-Tabrizi & Bass 2017; Notoxcellia Desvignes et al. 2022; Salmoxcellia Karlsbakk, Nystøyl, Plarre & Nylund 2021; Xcellia Freeman, Fuss, Kristmundsson, Keeling, Shalchian-Tabrizi & Bass 2017.
- Phylum Dinoflagellata Bütschli 1885, emend. Fensome et al. 1993, emend. Adl et al. 2005. Incertae sedis genera: free-living (Adenoides, Akashiwo, Amphidiniella, Ankistrodinium, Apicoporus, Archaeosphaerodiniopsis, Bispinodinium, Bysmatrum, Cabra, Cladopyxis, Crypthecodinium, Cucumeridinium, Dactylodinium, Dicroerisma, Gloeodinium, Grammatodinium, Gynogonadinium, Gyrodiniellum, Halostylodinium, Heterodinium, Moestrupia, Paragymnodinium, Phytodinium, Plagiodinium, Planodinium, Pileidinium, Pseudadenoides, Pseudothecadinium, Pyramidodinium, Rhinodinium, Roscoffia, Sabulodinium, Sphaerodinium, Spiniferodinium, Testudodinium, Thecadinium, Thecadiniopsis, Togula) and parasitic Blastodiniales Chatton 1906 (Amyloodinium, Apodinium, Cachonella, Caryotoma, Crepidoodinium, Haplozoon, Oodinium, Myxodinium, Piscinoodinium, Protoodinium, Rhinodinium, Schyzochitriodinium, Stylodinium).
- Psammosa Okamoto, A. Horák & Keeling 2012
- Family Oxyrrhinaceae Sournia 1984. Sole genus: Oxyrrhis Dujardin 1841.
- Eleftheros Tikhonenkov, Hehenberger & Keeling 2023
- Class Endodinea Cavalier-Smith 2017 → order Ichthyodinida Cavalier-Smith 2017 (environmental Marine Alveolate Group I)
- Class Ellobiopsea A.R.Loeblich 1976 → order Ellobiopsida Whisler 1990 → family Ellobiopsidae Coutière 1911. Genera: Ellobiopsis Caullery 1910; Thalassomyces Niezabitowski 1913; Parallobiopsis B.Collin 1913; Ellobiocystis Coutière 1911; Rhizellobiopsis Hovasse 1926.
- Class Syndiniophyceae/Syndinea A.R.Loeblich 1976 → order Syndiniales A.R.Loeblich 1976
- Class Noctiluciphyceae Fensome et al. 1993→ order Noctilucales Haeckel 1894. Abedinium, Cachonodinium, Craspedotella, Cymbodinium, Kofoidinium, Leptodiscus, Noctiluca, Petalodinium, Pomatodinium, Scaphodinium, Spatulodinium.
- Class Dinophyceae Pascher 1914
- Subclass Gymnodiniphycidae Fensome et al. 1993
- Gymnodiniales F. Stein 1878, emend. G. Hansen & Moestrup in Daugbjerg et al. 2000 sensu stricto. Barrufeta, Chytriodinium, Dissodinium, Erythropsidinium, Greuetodinium, Gymnodinium, Lepidodinium, Nematodinium, Nusuttodinium, Pellucidodinium, Polykrikos, Proterythropsis, Wangodinium, Warnowia.
- Amphidinium Claparède & Lachmann 1859, emend. Flø Jørgensen et al. 2004 sensu stricto
- Gyrodinium Kofoid & Swezy 1921, emend. G. Hansen & Moestrup in Daugbjerg et al. 2000 sensu stricto
- Kareniaceae Bergholtz et al. 2005. Brachidinium, Karenia, Karlodinium, Takayama.
- Ceratoperidiniaceae Loeblich III 1980, emend. Reñé & de Salas 2013. Ceratoperidinium, Kirithra.
- Torodiniales Boutrup, Moestrup & Daugbjerg 2016. Kapelodinium, Torodinium.
- Levanderina Moestrup et al. 2014
- Margalefidinium F. Gómez, Richlen & D.M. Anderson 2017
- Cochlodinium F. Schütt emend. F. Gómez, Richlen & D.M. Anderson 2017 sensu stricto
- Ptychodiscales Fensome et al. 1993. Achradina, Amphilothus, Balechina, Ptychodiscus, Sclerodinium.
- Borghiellaceae Moestrup, Lindberg, & Daugbjerg 2009. Baldinia, Borghiella.
- Tovelliaceae Moestrup et al. 2005. Bernardinium, Esoptrodinium, Jadwigia, Tovellia.
- Suessiaceae Fensome et al. 1993, emend. Moestrup et al. 2009. Ansanella, Asulcocephalium, Biecheleria, Biecheleriopsis, Leiocephalium, Pelagodinium, Polarella, Prosoaulax, Protodinium, Symbiodinium, Yihiella.
- Subclass Peridiniphycidae Fensome et al. 1993
- Gonyaulacales Taylor 1980. Alexandrium, Amylax, Ceratium, Ceratocorys, Coolia, Fukuyoa, Fragilidium, Gambierdiscus, Goniodoma, Gonyaulax, Lingulodinium, Ostreopsis, Pentaplacodinium, Peridiniella, Protoceratium, Pyrocystis, Pyrodinium, Pyrophacus, Tripos.
- Peridiniales Haeckel 1894. Amphidiniopsis, Archaeperidinium, Blastodinium*, Diplopelta, Diplopsalis, Diplopsalopsis, Herdmania, Niea, Oblea, Palatinus, Parvodinium, Peridinium, Peridiniopsis, Preperidinium, Protoperidinium, Qia, Vulcanodinium.
- Thoracosphaeraceae Schiller 1930. Aduncodinium, Amyloodinium, Apocalathium, Blastodinium, Chimonodinium, Cryptoperidiniopsis, Duboscquodinium, Ensiculifera, Laciniporus, Leonella, Luciella, Naiadinium, Paulsenella, Pentapharsodinium, Pfiesteria, Scrippsiella, Stoeckeria, Theleodinium, Thoracosphaera, Tintinnophagus, Tyrannodinium.
- Podolampadaceae Lindemann 1928. Blepharocysta, Gaarderiella, Heterobractum, Lissodinium, Mysticella, Podolampas.
- Kryptoperidiniaceae Lindemann 1925 . Blixaea, Durinskia, Galeidinium, Kryptoperidinium, Unruhdinium, etc.
- Heterocapsaceae Fensome et al. 1993. Heterocapsa.
- Amphidomataceae Sournia 1984. Amphidoma, Azadinium.
- Oxytoxaceae Lindemann 1928. Corythodinium, Oxytoxum.
- Centrodiniaceae Hernández-Becerril 2010. Centrodinium.
- Dinophysales Kofoid 1926. Amphisolenia, Citharistes, Dinofurcula, Dinophysis, Histioneis, Latifascia, Metadinophysis, Metaphalacroma, Ornithocercus, Oxyphysis, Parahistioneis, Phalacroma, Pseudophalacroma, Sinophysis, Triposolenia.
- Prorocentrales Lemmermann 1910. Mesoporus, Prorocentrum.
- Class Squirmidea Cavalier-Smith 2014. Digyalum, Filipodium, Platyproteum.
- Phylum Apicomplexa Levine 1980, emend. Adl et al. 2005. Incertae sedis genera: Aggregata Frenzel 1885, Christalloidophora Dehorne 1934, Dobellia* Ikeda 1914, Echinococcidium* Porchet 1978, Globidiellum* Brumpt 1913, Joyeuxella* Brasil 1902, Rhabdospora* Laguesse 1906, Spermatobium* Eisen 1895, Spiriopsis* Arvy & Peters 1972, Spirogregarina* Wood & Herman 1943, Toxocystis* Léger & Duboscq 1910, Trophosphaera* Le Calvez 1939.
- Order Agamococcidiorida Levine 1979 (=Histogregarida Cavalier-Smith 2014)
- Order Protococcidiorida Kheisin 1956 (=Coelotrophiida Vivier 1982). Angeiocystis*, Coelotropha*, Grellia*, Eleutheroschizon*, Mackinnonia*, Myriosporides*, Myriospora*, Sawayella*.
- Aconoidasida Mehlhorn, Peters & Haberkorn 1980 (=Hematozoa Vivier 1982)
- Order Haemospororida Danielewsky 1885. Dionisia*, Haemocystidium, Haemoproteus, Hepatocystis, Leucocytozoon, Mesnilium*, Nycteria, Parahaemoproteus, Plasmodium, Polychromophilus, Rayella*, Saurocytozoon*.
- Order Piroplasmida Wenyon 1926. Anthemosoma*, Babesia, Cytauxzoon, Echinozoon*, Haemohormidium*, Sauroplasma*, Serpentoplasma*, Theileria.
- Order Nephromycida Cavalier-Smith 1993, emend. Adl et al. 2019. Nephromyces, Cardiosporidium.
- Conoidasida Levine 1988
- Order Corallicolida Kwong et al. 2021 → family Corallicolidae Kwong et al. 2021. Genera: Corallicola Kwong et al. 2021; Anthozoaphila Kwong et al. 2021; Gemmocystis Upton & Peters 1986.
- Coccidia Leuckart 1879 (P)
- Suborder Adeleorina Léger 1911. Adelea*, Adelina, Babesiosima*, Bartazoon*, Chagasella*, Cyrilia*, Dactylosoma, Desseria*, Ganapatiella*, Gibbsia*, Haemogregarina, Haemolivia, Hepatozoon, Ithania*, Karyolysus, Klossia, Klossiella*, Legerella*, Orcheobius*, Rasajeyna*.
- Suborder Eimeriorina Léger 1911. Atoxoplasma, Barrouxia*, Besnoitia, Caryospora, Caryotropha, Choleoeimeria, Cyclospora, Cystoisospora, Defretinella*, Diaspora*, Dorisa*, Dorisiella*, Eimeria, Elleipsisoma*, Goussia, Hammondia, Hyaloklossia, Isospora, Lankesterella, Mantonella*, Merocystis, Neospora, Nephroisospora, Ovivora*, Pfeifferinella, Pseudoklossia, Sarcocystis, Schellackia, Selenococcidium*, Selysina*, Spirocystis*, Toxoplasma, Tyzzeria*, Wenyonella*.
- Gregarinida Dufour 1828. Incertae sedis taxa: Digyalum Koura et al. 1990, Exoschizon Hukui 1939.
- Archigregarinorida Grassé 1953 (P). Meroselenidium, Merogregarina, Selenidium, Selenocystis, Veloxidium.
- Eugregarinorida Léger 1900 (P). Apolocystis*, Amoebogregarina, Ancora, Ascogregarina, Asterophora, Blabericola, Caliculium, Cephaloidophora, Colepismatophila, Cystobia*, Cystocephalus*, Difficilina, Diplauxis*, Enterocystis, Ganymedes, Geneiorhynchus, Gonospora, Gregarina, Heliospora, Hentschelia*, Hirmocystis*, Hoplorhynchus, Lankesteria, Lecudina, Leidyana, Lithocystis, Monocystella*, Monocystis, Nematopsis, Nematocystis*, Neoasterophora*, Paralecudina, Paraschneideria, Phyllochaetopterus, Pileocephalus*, Polyplicarium, Polyrhabdina, Porospora*, Prismatospora, Protomagalhaensia, Psychodiella, Pterospora, Pyxinia, Pyxinioides, Rhabdocystis*, Sphaerorhynchus*, Steinina, Stenophora, Stylocephalus, Sycia*, Syncystis, Thalicola*, Thiriotia, Trichotokara, Uradiophora*, Urospora, Xiphocephalus, Zygosoma*, and more.
- Neogregarinorida Grassé 1953. Apicystis, Aranciocystis, Caulleryella*, Coelogregarina*, Farinocystis*, Gigaductus*, Lipocystis*, Lipotropha*, Lymphotropha*, Machadoella*, Mattesia, Menzbieria, Ophryocystis, Schizocystis*, Syncystis, Tipulocystis*.
- Cryptogregarinorida Cavalier-Smith 2014, emend. Adl et al. 2019. Cryptosporidium.
- Class Blastogregarinea Chatton and Villeneuve 1936, emend. Simdyanov et al. 2018. Chattonaria, Siedleckia.
- Postciliodesmatophora Gerassimova & Seravin 1976
- Intramacronucleata Lynn 1996. Incertae sedis taxa: Protocruziidae Jankowski 1980 (Protocruzia Faria da Cunha & Pinto 1922).
- SAL Gentekaki et al. 2014. Incertae sedis taxa: Cariacotrichea Orsi et al. 2011 (Cariacothrix caudata), Mesodiniidae ankowski, 1980 (Mesodinium), Phacodiniidia Small and Lynn 1985 (Phacodinium).
- Spirotrichea Bütschli 1889
- Euplotia Jankowski 1979
- Perilemmaphora Berger 2008
- Hypotrichia Stein 1859
- Stichotrichida Fauré-Fremiet 1961 (P)
- Amphisiellidae Jankowski 1979. Amphisiella, Bistichella.
- Atractosidae Bourland 2015. Atractos.
- Epiclintidae Wicklow & Borror 1990. Epiclintes.
- Gonostomatidae Small & Lynn 1985. Cotterillia, Gonostomum.
- Halteriidae Claparède & Lachmann 1858. Halteria, Meseres.
- Holostichidae Fauré-Fremiet 1961. Holosticha, Uncinata.
- Kahliellidae Tuffrau 1979. Deviata, Kahliella.
- Keronidae Dujardin 1840. Kerona.
- Oxytrichidae Ehrenberg 1830 (P). Cyrtohymena, Gastrostyla, Oxytricha, Stylonychia.
- Parabirojimidae Dai & Xu 2011. Parabirojimia, Tunicothrix.
- Plagiotomidae Bütschli 1887. Plagiotoma.
- Psammomitridae Jankowski 1979. Psammomitra.
- Pseudoamphisiellidae Song et al. 1996. Pseudoamphisiella.
- Psilotrichidae Bütschli 1889. Psilotricha, Urospinula.
- Schmidingerotrichidae Foissner 2012. Schmidingerothrix.
- Spirofilidae von Gelei 1929. Spirofilopsis, Strongylidium.
- Trachelostylidae Small & Lynn 1985. Trachelostyla.
- Uroleptidae Foissner & Stoeck 2008. Paruroleptus, Uroleptus.
- Urostylida Jankowski 1979 (P)
- Oligotrichea Bütschli 1887
- Licnophoridae Bütschli 1887. Licnophora, Prolicnophora.
- Kiitrichidae Nozawa 1941. Caryotricha, Kiitricha.
- Lamellicorticata Vd'ačný et al. 2010
- CONTHREEP Lynn in Adl et al. 2012 . Incertae sedis taxa: Askenasia Blochmann 1895, Cyclotrichiidae Jankowski 1980 (Cyclotrichium), Paraspathidium Noland 1937, Pseudotrachelocercidae Song 1990 (Pseudotrachelocerca), Discotrichidae Jankowski 1967 (Discotricha, Lopezoterenia).
- Phyllopharyngea de Puytorac et al. 1974
- Colpodea Small & Lynn 1981
- Nassophorea (P)
- Prostomatea Schewiakoff 1896 (P)
- Plagiopylea Small & Lynn 1985
- Oligohymenophorea de Puytorac et al. 1974
- Apostomatia Chatton & Lwoff 1928
- Astomatia Schewiakoff 1896
- Hymenostomatia Delage & Hérouard 1896
- Peniculia Fauré-Fremiet in Corliss 1956 (P)
- Peritrichia Stein 1859
- Sessilida Kahl 1933
- Astylozoidae Kahl 1935. Astylozoon, Hastatella.
- Ellobiophryidae Chatton and Lwoff 1929. Ellobiophrya.
- Epistylididae Kahl 1933. Epistylis.
- Lagenophryidae Bütschli 1889. Lagenophrys.
- Operculariidae Fauré-Fremiet in Corliss 1979. Opercularia.
- Rovinjellidae Matthes 1972. Rovinjella.
- Scyphidiidae Kahl 1933 (P). Scyphidia.
- Termitophryidae Lom in Corliss 1979. Termitophrya.
- Usconophryidae Clamp 1991. Usconophrys.
- Vaginicolidae de Fromentel 1874. Cothurnia, Pyxicola, Thuricola, Vaginicola.
- Vorticellidae Ehrenberg 1838. Carchesium, Epicarchesium (P), Ophrydium, Pelagovorticella, Pseudovorticella (P), Vorticella (P).
- Zoothamniidae Sommer 1951. Haplocaulus, Zoothamnium.
- Mobilida Kahl 1933
- Scuticociliatia Small 1967 (P)
Rhizaria Cavalier-Smith 2002
Cercozoa Cavalier-Smith 1998, emend. Adl et al. 2005; emend. Cavalier-Smith 2018
- Incertae sedis taxa:
- Aquavolonida Bass & Berney 2018. Aquavolon, Lapot.
- Tremulida Howe et al. 2011. Tremula.
- Genera of uncertain placement: Dictiomyxa, Katabia, Myxodictyium, Pontomyxa, Protomyxa, Protogenes, Pseudospora, Rhizoplasma
- Discocelia Cavalier-Smith 2013
- Psammonobiotidae* Golemansky 1974, emend. Meisterfeld 2002. Alepiella, Chardezia, Edaphonobiotus, Feuerbornia, Frenzelina, Lesquerella, Micramphora, Micropsammella, Nadinella, Ogdeniella, Psammonobiotus, Propsammonobiotus, Rhumbleriella.
- Sarcomonadea Cavalier-Smith 1993 emend. Cavalier-Smith 2018 (P)
- Cercomonadida Poche 1913, emend. Vickerman 1983, emend. Mylnikov 1986, emend. Karpov et al. 2006; emend Howe et al. 2009; emend Cavalier-Smith 2012 . Cercomonas, Eoercomonas, Filomonas, Neocercomonas, Cavernomonas.
- Paracercomonadida Cavalier-Smith 2018 . Brevimastigomonas, Metabolomonas, Nucleocercomonas, Paracercomonas, Phytocercomonas.
- Glissomonadida Howe & Cavalier-Smith 2009
- Saccharomycomorphidae Feng, He, Jiang, Zhang & Yu 2021. Saccharomycomorpha.
- Sandonidae Howe et al. 2009. Sandona, Flectomonas, Neoheteromita, Mollimonas.
- Dujardinidae Howe & Cavalier-Smith 2011. Dujardina.
- Bodomorphidae Hollande 1952, emend. Cavalier-Smith in Howe et al. 2009. Bodomorpha.
- Proleptomonadidae Howe et al. 2009. Proleptomonas.
- Allapsidae Howe & Cavalier-Smith 2009. Allapsa, Teretomonas, Allantion.
- Viridiraptoridae Hess & Melkonian 2013. Orciraptor, Viridiraptor.
- Pansomonadidae Vickerman in Vickerman et al. 2005. Agitata, Aurigamonas.
- Sainouroidea Schuler et al. 2018
- Thecofilosea Cavalier-Smith 2003, emend. Cavalier-Smith 2011. Incertae sedis taxa: Mataza.
- Phaeodarea Haeckel 1879
- Phaeoconchia Haeckel 1879. Coelodendrum, Coelographis, Conchellium, Conchopsis.
- Phaeocystina Haeckel 1879. Aulacantha, Aulographis, Cannoraphis.
- Phaeogromia Haeckel 1879. Castanella, Challengeron, Haeckeliana, Medusetta, Tuscarora.
- Phaeosphaeria Haeckel 1879. Aulosphaera, Cannosphaera, Sagosphaera.
- Cryomonadida Cavalier-Smith 1993
- Ventricleftida Cavalier-Smith 2011
- Tectofilosida Cavalier-Smith 2003
- Ebriacea Lemmermann 1901 . Ebria, Hermesinum, Botuliforma.
- Imbricatea Cavalier-Smith 2011
- Spongomonadida Hibberd 1983 . Rhipidodendron, Spongomonas.
- Marimonadida Cavalier-Smith & Bass 2011
- Variglissida Cavalier-Smith 2014
- Silicofilosea Adl et al. 2005, emend. Adl et al. 2012
- Thaumatomonadida Shirkina 1987
- Thaumatomonadidae Hollande 1952. Allas, Hyaloselene, Reckertia, Thaumatomonas, Thaumatomastix, Ovaloplaca, Scutellomonas, Thaumatospina, Penardeugenia.
- Peregriniidae Cavalier-Smith 2011. Gyromitus, Peregrinia.
- Esquamulidae Shiratori, Yabuki & Ishida 2012. Esquamula.
- Euglyphida Copeland 1956, emend. Cavalier-Smith 1997. Incertae sedis taxa: Phaeobola.
- Cyphoderiidae de Saedeleer 1934. Campascus*, Corythionella, Cyphoderia , Messemvriella*, Pseudocorythion, Ichthyosquama, Knarr, Oleiformis, Psammoderia.
- Paulinellidae de Saedeleer 1934, emend. Adl et al. 2012. Micropyxidiella, Ovulinata, Paulinella.
- Euglyphina Kosakyan et al. 2016
- Assulinidae Lara et al. 2007. Assulina, Placocista, Valkanovia*.
- Sphenoderiidae Chatelain et al. 2013. Sphenoderia, Trachelocorythion, Deharvengia*.
- Trinematidae Hoogenraad & De Groot 1940, emend Adl et al. 2012. Corythion, Playfairina*, Puytoracia*, Trinema.
- Euglyphidae Wallich 1864, emend Lara et al. 2007. Euglypha, Scutiglypha.
- Tracheleuglypha Deflandre 1928
- Trivalvulariida Siemensma & Dumack 2020. Leptogromia, Trivalvularis.
- Metromonadea Cavalier-Smith 2007, emend. Cavalier-Smith 2011. Metromonas, Metopion, Micrometopion, Kiitoksia.
- Granofilosea Cavalier-Smith & Bass 2009. Incertae sedis taxa*: ?Apogromia, ?Kibisidytes, ?Leucodictyon, ?Limnofila, ?Mesofila, ?Microcometes, ?Microgromia, ?Nanofila, ?Reticulamoeba and probably ?Belaria, ?Ditrema, ?Heliomorpha and ?Paralieberkuehnia.
- Chlorarachnea Hibberd & Norris 1984. Amorphochlora, Bigelowiella, Chlorarachnion, Cryptochlora, Gymnochlora, Lotharella, Minorisa, Partenskyella, Viridiuvalis.
Endomyxa Cavalier-Smith 2002, emend. Bass & Berney in Adl et al. 2019
- Vampyrellida West 1901, emend. Hess et al. 2012 . Incertae sedis taxa: Arachnula, Gobiella, Lateromyxa, Penardia.
- Phytomyxea Engler & Prantl 1897
- Marinomyxa Kolátková, Čepička, Hoffman & Vohník 2021
- Plasmodiophorida Cook 1928 . Plasmodiophora , Polymyxa, Woronina, Ligniera , Sorosphaerula , Spongospora , ?Membranosorus, ?Octomyxa, ?Polymyxa, ?Sorodiscus, ?Tetramyxa .
- Phagomyxida Cavalier-Smith 1993. Phagomyxa, Maullinia.
- Filoreta Bass & Cavalier-Smith 2009
- Gromia Dujardin 1835
- Ascetosporea Sprague 1979, emend. Cavalier-Smith 2009
Retaria Cavalier-Smith 2002
- Foraminifera d'Orbigny 1826. Incertae sedis taxa: ?Lagenida, ?Heterogromia, ?Komokiacea*.
- Monothalamids Pawlowski et al. 2013 (P) . All genera traditionally in Allogromiida, Astrorhizida, and the Xenophyophorea. Genera unplaced into families: Allogromia, Astrammina, Crithionina, Notodendrodes, Psammophaga, Bathysiphon.
- Tubothalamea Pawlowski et al. 2012. †Fusulinida Delage & Hérouard 1896 probably belongs to this group.
- Globothalamea Pawlowski et al. 2012
- Rotaliida Delage & Hérouard 1896
- Globigerinida Lankester 1885 emend. Arz, Arenillas & Gilabert 2022 (P)
- †Parvularugoglobigerinoidea Arenillas, Arz & Gilabert 2022
- Eoglobigerinoidea BouDagher-Fadel 2012
- †Eoglobigerinidae Blow 1979. Alicantina, Eoclavatorella, Eoglobigerina, Parasubbotina, Pseudoglobigerinella, Subbotina, Turbeogloborotalia.
- Globoquadrinidae Blow 1979. Dentoglobigerina, Globoquadrina.
- †Neoacarininidae BouDagher-Fadel 2012. Neoacarinina.
- †Porticulasphaeridae Banner 1982. Globigerinatheka, Guembelitrioides, Inordinatosphaera, Orbulinoides, Porticulasphaera.
- Globigerinoidea Carpenter, Parker & Jones 1862
- Globigerinidae Carpenter, Parker & Jones 1862. Alloglobigerinoides, Ciperoella, Globigerina, Globicuniculus, Globigerinoides, Globigerinoidesella, Globoturborotalita, Trilobigerina , Zeaglobigerina.
- Globigerinellidae BouDagher-Fadel 2012. Beella, Bolliella, Globigerinella, Orcadia, Protentella, Quiltyella.
- Hastigerinidae Bolli, Loeblich & Tappan 1957. Hastigerina, Hastigerinella, Hastigerinopsis.
- Orbulinidae Schultze 1854. Biorbulina, Candorbulina, Orbulina, Praeorbulina.
- Sphaeroidinellidae Banner & Blow 1959. Prosphaeroidinella, Sphaeroidinella, Sphaeroidinellopsis.
- Turborotalitidae Hofker 1976. Berggrenia, Turborotalita.
- Globorotalioidea Cushman 1927
- †Catapsydracidae Bolli, Loeblich & Tappan 1957. Catapsydrax, Globigerinopsoides, Globigerinoita, Velapertina.
- Globorotaloididae Banner & Blow 1959. Clavatorella, Globorotaloides, Protentelloides.
- Globorotaliidae Cushman 1927. Dentigloborotalia, Globoconella, Globorotalia, Hirsutella, Jenkinsella, Menardella, Neogloboquadrina, Paragloborotalia, Truncorotalia.
- Pulleniatinidae Cushman 1927. Pulleniatina.
- †Globanomalinidoidea Loeblich & Tappan 1984
- †Hantkeninoidea Cushman 1927
- †Truncorotaloidinoidea BouDagher-Fadel 2012
- †Globigerapsidae Blow 1979. Globigerapsis, Muricoglobigerina.
- †Planorotalitidae BouDagher-Fadel 2012. Astrorotalia, Planorotalites.
- †Truncorotaloididae Loeblich & Tappan 1961. Acarinina, Igorina, Morozovella, Morozovelloides, Pearsonites, Praemurica, Pseudogloboquadrina, Testacarinata, Truncorotaloides.
- †Globotruncanida Arz, Arenillas & Gilabert 2022
- †Abathomphaloidea Arz, Arenillas & Gilabert 2022
- †Favuselloidea Longoria 1974
- †Hedbergelloidea Longoria & Gamper 1975
- †Ananiidae El-Nakhal 2010. Anania, Badriella, Costellagerina, Hillsella, Liuenella , Loeblichella, Muricohedbergella, Paracostellagerina, Pessagnoina, Planohedbergella, Pseudoclavihedbergella, Vanhintella.
- †Hedbergellidae Loeblich & Tappan 1961. Asterohedbergella, Clavihedbergella, Hedbergella, Microhedbergella, Paraticinella, Pseudoguembelitria.
- †Helvetoglobotruncanidae Lamolda 1976. Angulocarinella, Bermudeziana, Bollitruncana, Fingeria, Hedbergellita, Brittonella, Helvetoglobotruncana, Unitruncatus, Whiteinella.
- †Praehedbergellidae Banner & Desai 1988. Blefuscuiana, Gorbachikella, Praehedbergella, Lilliputianella, Lilliputianelloides, Wondersella.
- †Globotruncanoidea Brotzen 1942
- †Globotruncanidae Brotzen 1942. Contusotruncana, Globotruncana, Marginotruncana, Obliquacarinata, Sphaerotruncana, Ventrotruncana.
- †Praeglobotruncanidae Ion 1983. Concavatotruncana, Dicarinella, Falsotruncana, Rotundina, Praeglobotruncana, Verotruncana.
- †Reissidae Korchagin 2001. Elevatotruncana, Globotruncanita, Kassabiana, Radotruncana, Sigalitruncana, Turbotruncana.
- †Planomalinoidea Bolli, Loeblich & Tappan 1957
- †Eohastigerinellidae Loeblich & Tappan 1984. Eohastigerinella, Hastigerinoides.
- †Globigerinelloididae Longoria 1974. Alanlordella, Allotheca, Biglobigerinella, Blowiella, Claviblowiella, Globigerinelloides, Pseudoschackoina.
- †Planomalinidae Bolli, Loeblich & Tappan 1957. Bannerina, Planomalina, Pseudoplanomalina.
- †Schackoinidae Pokorný 1958. Asymetria, Groshenyia, Leupoldina, Neoschackoina, Schackoina.
- †Rotaliporoidea Sigal 1958
- †Rugoglobigerinoidea Subbotina 1959
- †Helvetiellidae Longoria & Gamper 1984. Archaeoglobigerina, Bucherina, Dorbignya, Edgarinella, Gandolfia, Gansserina, Globocarinata, Helvetiella, Kuglerina.
- †Rugoglobigerinidae Subbotina 1959. Archaeoglobitruncana, Plummerita, Rugoglobigerina, Rugosocarinata, Rugotruncana, Trinitella.
- †Heterohelicida Fursenko 1958, emend. Arz, Arenillas & Gilabert 2022
- †Heterohelicoidea Cushman 1927
- †Gublerinidae Aliyulla 1977. Gublerina, Lipsonia, Praegublerina.
- †Heterohelicidae Cushman 1927. Braunella, Bronnimannella, Ehrenbergites, Globoheterohelix, Fleisherites, Hartella, Heterohelix, Huberella, Laeviheterohelix, Lazarusina, Lunatriella, Magellanina, Mihaia, Nederbragtina, Planoheterohelix, Protoheterohelix, Pseudoplanoglobulina, Steineckia, Striataella, Texasina, ?Bifarina, ?Rectoguembelina, ?Zeauvigerina.
- †Pseudotextulariidae Maamouri & Salaj 1978. Planoglobulina, Pseudotextularia, Racemiguembelina.
- †Pseudoguembelinidae Aliyulla 1977. Eicheriella, Leptobimodalia, Pseudoguembelina.
- †Spiroplectidae Cushman 1911. Hendersonites , Neohendersonites, Paraspiroplecta, Spiroplecta.
- †Ventilabrellidae Maamouri & Salaj 1978. Planulitella, Proliferania, Sigalia, Ventilabrella.
- †Guembelitriida Arenillas, Arz & Gilabert 2022
- Order ? (unnamed)
- Robertinida Loeblich & Tappan 1984. Hoeglundina, Robertina, Robertinoides.
- Textulariida Delage & Hérouard 1896 (P). Cyclammina, Eggerella, Reophax, Textularia, Trochammina.
- Carterinida Loeblich & Tappan 1981. Carterina.
- Radiolaria Müller 1858, sensu Adl et al. 2005
- Acantharea Haeckel 1881, emend. Mikrjukov 2000
- Chaunocanthida Schewiakoff 1926. Amphiacon, Conacon, Gigartacon, Heteracon, Stauracon.
- Holocanthida Schewiakoff 1926. Acanthochiasma, Acanthocolla, Acanthoplegma.
- Symphyacanthida Schewiakoff 1926. Amphilithium, Astrolonche, Pseudolithium.
- Arthracanthida Schewiakoff 1926. Acanthometra, Daurataspis, Dictyacantha, Diploconus, Phractopelta, Phyllostaurus, Pleuraspis, Stauracantha.
- Taxopodida Fol 1883. Sticholonche.
- Polycystinea Ehrenberg 1839 stat. nov. Levine et al. 1980
- Spumellaria Ehrenberg 1876 stat. nov. Haeckel 1884
- Hexacromyoidea Haeckel 1882 stat. nov. Suzuki et al. 2021
- Spongosphaeroidea Haeckel 1862 → Spongosphaeridae Haeckel 1862: Diplospongus Mast 1910, Spongodendron Hollande & Enjumet 1960, Spongosphaera Ehrenberg 1847 .
- Lithocyclioidea Ehrenberg 1846
- Astracturidae Haeckel 1882: Astromma Ehrenberg 1846 , Amphactura Haeckel 1882 , Hymeniastrum Ehrenberg 1846 .
- Lithocycliidae Ehrenberg 1846: Cromyatractus Haeckel 1887 , Heliosestrum Haeckel 1882 ; Heliostylus Haeckel 1882 , Lithocyclia Ehrenberg 1846 , Phacostaurus Haeckel 1882 , Phacotriactis Sutton 1896, Sethostylus Haeckel 1882 , Staurocyclia Haeckel 1882 , Triactiscus Haeckel 1882 .
- Panartidae Haeckel 1887: Cannartus Haeckel 1882 , Diartus Sanfilippo & Riedel 1980, Didymocyrtis Haeckel 1862 , Spongolivella Dumitrica 2021.
- Phacodiscidae Haeckel 1882: Periphaena Ehrenberg 1874 , Phacodiscus Haeckel 1882 .
- Spongodiscoidea Haeckel 1862 emend. Suzuki 2021
- Spongodiscidae Haeckel 1862: Spongaster Ehrenberg 1861 , Spongodiscus Ehrenberg 1854 , Spongotrochus Haeckel 1861 .
- Euchitoniidae Stöhr 1880 emend. Suzuki 2021: Amphicraspedum Haeckel 1882 , Dictyocoryne Ehrenberg 1861 , Hexinastrum Haeckel 1882 , Ommatocampe Haeckel 1861 , Tessarastrum Haeckel 1887 , Tricanastrum Haeckel 1879 , Trigonastrum Haeckel 1887 .
- Spongobrachiidae Haeckel 1882 emend. Suzuki 2021: Spongasteriscus Haeckel 1862 , Spongastromma Haeckel 1887, Spongobrachium Haeckel 1882.
- Cladococcoidea Haeckel 1862 stat. nov. Suzuki et al. 2021
- Ethmosphaeridae Haeckel 1862: Cyrtidosphaera Haeckel 1861, Ethmosphaera Haeckel 1861, , Haplosphaera Hollande & Enjumet 1960, Heliosphaera Haeckel 1861 , Liosphaera Haeckel 1887 .
- Cladococcidae Haeckel 1862: Arachnosphaera Haeckel 1861 , Arachnospongus Mast 1910, Cladococcus Müller 1856 , Diplosphaera Haeckel 1861 , Haeckeliella Hollande & Enjumet 1960, Lychnosphaera Haeckel 1882 .
- Trematodiscoidea Haeckel 1862 emend. Suzuki 2021 → Trematodiscidae Haeckel 1862 emend. Suzuki 2021: Flustrella Ehrenberg 1839 , Staurospira Haeckel 1887 , Stylodictya Ehrenberg 1846 , Tripodictya Haeckel 1882 .
- Haliommoidea Ehrenberg 1846
- Actinommidae Haeckel 1862 emend. Suzuki 2021: Actinomma Haeckel 1861 , Cromyechinus Haeckel 1882 , Rhaphidocapsa Haeckel 1887, Sphaeractis Brandt in Wetzel 1936, Staurocaryum Haeckel 1882, Stomatosphaera Dreyer 1889, Stuermeria Deflandre 1964.
- Haliommidae Ehrenberg 1846 emend. Suzuki 2021: Cromyosphaera Haeckel 1882 , Haliomma Ehrenberg 1839 , Haliommantha Haeckel 1887, Hexacontella Haeckel 1887, Melittosphaera Haeckel 1882 , Pseudostaurosphaera Krasheninnikov 1960 .
- Heliodiscidae Haeckel 1882 sensu De Wever et al. 2001: Actinommura Haeckel 1887 , Excentrococcus Dumitrica 1978, Excentrodiscus Hollande & Enjumet 1960, Heliodiscus Haeckel 1862 , Helioferrusa Dumitrica 2019, Phaenicosphaera Haeckel 1887 .
- Lithelioidea Haeckel 1862 sensu Matsuzaki et al. 2015
- Spongopyloidea Dreyer 1889 emend. Suzuki 2021
- Phorticioidea Haeckel 1882 stat. nov. Suzuki et al. 2021
- Larcospiroidea Haeckel 1887 stat. nov. sensu Dumitrica 1989
- Pseudoaulophacoidea Riedel 1967 sensu De Wever et al. 2001
- Stylosphaeroidea Haeckel 1887 sensu Dumitrica 1984
- Nassellaria Ehrenberg 1875 emend. Haeckel 1887. Artostrobus, Eucyrtidium, Lithomelissa, Pterocanium, Pterocorys.
- Collodaria Haeckel 1887. Acrosphaera, Collosphaera, Collozoum, Sphaerozoum, Rhaphidozoum, Siphonsphaera, Thalassicolla.
- Orodaria Nakamura & Suzuki 2020
- †Entactinaria Kozur & Mostler 1982 sensu Nakamura & Suzuki 2020
- †Entactiniidae Riedel 1967. Afanasievella, Apophysiactinia, Borisella, Callela, Cancellosphaera, Costaentactinia, Cyclocarpus nomen dubium, Duodecimentactinia, Langsonsphaera, Entactinosphaera, Gracilentactinia, Holdisphaera, Involutentactinia, Kashiwara, Magnentactinia, Magnisphaera, Microporosa, Moskovistella, Multientactinia, Munzuwonella, Paratriposphaera, Perforentactinia, Plenoentactinia, Plenosphaera, Pluristratoentactinia, Polyedroentactinia, Provisocyntra, Radiobisphaera, Retentactinia, Retisphaera, Sinosphaera, Spongentactinia, Stigmosphaerostylus, Trilonche, Uberinterna, Wuyia.
- †Tetrentactiniidae Kozur & Mostler 1979. Multisphaera.
- †Triassothamnidae Takahashi, Maekawa & Dumitrica 2022. Triassothamnus.
Haptista Cavalier-Smith 2003
- Haptophyta Hibberd 1976, ex. Edvardsen & Eikrem 2000
- Pavlovales Green 1976 . Diacronema, Exanthemachrysis, Pavlova, Rebecca.
- Prymnesiophyceae Hibberd 1976
- Prymnesiales Papenfuss 1955, emend. Edvardsen & Eikrem 2000. Chrysochromulina, Chrysocampanula, Dicrateria, Haptolina, Prymnesium, Pseudohaptolina.
- Phaeocystales Medlin 2000. Phaeocystis.
- Isochrysidales Pascher 1910, emend. Edvardsen & Eikrem 2000. Emiliania, Gephyrocapsa, Isochrysis, Ruttnera, Tisochrysis.
- Coccolithales Schwarz 1932, emend. Edvardsen & Eikrem 2000. Balaniger, Calciosolenia, Coccolithus, Hymenomonas, Chrysotila, Wigwamma.
- Rappephyceae M. Kawachi, R. Kamikawa & T. Nakayama 2021
- Centroplasthelida Febvre-Chevalier & Febvre 1984
Cryptista Cavalier-Smith 1989, 2018, emend. Adl et al. 2019
- Palpitia Cavalier-Smith & Chao 2012 → Palpitea Cavalier-Smith & Chao 2012 → Palpitida Cavalier-Smith & Chao 2012 → Palpitidae Cavalier-Smith & Chao 2012. Palpitomonas Yabuki & Ishida 2010.
- Rollomonadia Cavalier-Smith 2013
- Kathablepharida/Katablepharidophyta Okamoto & Inouye 2005 → Kathablepharidea/Katablepharidophyceae Okamoto & Inouye 2005 → Kathablepharidida/Katablepharidales Okamoto & Inouye 2005 → Kathablepharididae Vørs 1992 emend. Clay & Kugrens 1999/Kathablepharidaceae Skuja 1939. Hatena Okamoto & Inouye 2006, Kathablepharis Skuja 1939, Leucocryptos Butcher 1967, Platychilomonas Larsen & Patterson 1990, Roombia Okamoto, Chantangsi, Horák, Leander & Keeling 2009.
- Cryptomonada Cavalier-Smith 2004
Excavates
Metamonada Grassé 1952, emend. Cavalier-Smith 1987
- Barthelona Bernard, Simpson & Patterson 2000
- Skoliomonas Eglit & Simpson 2024
- Anaeramoebae . Anaeramoeba.
- Fornicata Simpson 2003
- Parabasalia Honigberg 1973
- ?Tricercomitus
- Trichomonadida Kirby 1947. Cochlosoma, Dientamoeba, Lacusteria, Pentatrichomonas, Pentatrichomonoides, Pseudotrichomonas, Pseudotrypanosoma, Tetratrichomonas, Trichomonas, Trichomonoides, Trichomitopsis.
- Honigbergiellida Čepička et al. 2010 (P?). Ditrichomonas, Cthulhu, Cthylla, Hexamastix, Honigbergiella, Monotrichomonas.
- Hypotrichomonadida Čepička et al. 2010. Hypotrichomonas, Trichomitus.
- Tritrichomonadida Čepička et al. 2010 (P?). Dientamoeba, Histomonas, Monocercomonas, Parahistomonas, Simplicimonas, Tritrichomonas.
- Cristamonadida Brugerolle & Patterson 2001. Caduceia, Calonympha, Coronympha, Deltotrichonympha, Devescovina, Foaina, Gigantomonas, Joenia, Joenina, Joenoides, Joenopsis*, Kofoidia, Koruga, Macrotrichomonas, Macrotrichomonoides, Metadevescovina, Mixotricha, Pachyjoenia*, Projoenia*, Pseudodevescovina, Rhizonympha*, Snyderella, Stephanonympha.
- Spirotrichonymphida Grassé 1952. Holomastigotes*, Holomastigotoides, Microjoenia*, Micromastigotes*, Rostronympha*, Spiromastigotes*, Spironympha*, Spirotrichonympha*, Spirotrichonymphella, Uteronympha*.
- Lophomonadida Light 1927. Lophomonas.
- Trichonymphida Poche 1913. Barbulanympha, Eucomonympha, Heliconympha, Hoplonympha, Leptospironympha, Macrospironympha*, Pseudotrichonympha, Rhynchonympha*, Spirotrichosoma*, Staurojoenina, Teranympha, Trichonympha, Urinympha.
- Preaxostyla Simpson 2003
- Oxymonadida Grassé 1952. Barroella, Blattamonas, Brachymonas, Dinenympha, Microrhopalodina, Monocercomonoides, Notila, Opisthomitus, Oxymonas, Paranotila, Polymastix, Pyrsonympha, Sauromonas, Saccinobaculus, Streblomastix, Tubulimonoides.
- Trimastigidae Saville Kent 1880-1882. Trimastix.
- Paratrimastigidae Zhang et al. 2015. Paratrimastix.
Discoba Simpson in Hampl et al. 2009
Jakobida Cavalier-Smith 1993
- Pharyngomonada Cavalier-Smith 2008. Pharyngomonas
- Tetramitia Cavalier-Smith 1993
- Selenaionidae Hanousková et al. 2018. Dactylomonas, Selenaion.
- Neovahlkampfiidae Hanousková et al. 2018. Neovahlkampfia.
- Eutetramitia Hanousková et al. 2018
- Vahlkampfiidae Jollos 1917 (P). Fumarolamoeba, Heteramoeba, Naegleria, Neovahlkampfia, Paravahlkampfia, Tetramitus, Vahlkampfia, Willaertia.
- Gruberellidae Page & Blanton 1985. Gruberella*, Stachyamoeba.
- Acrasidae Poche 1913. Acrasis, Allovahlkampfia, Pocheina.
- Percolomonadidae Cavalier-Smith 2008. Percolomonas.
- Psalteriomonadidae Cavalier-Smith 1993. Harpagon, Psalteriomonas, Monopylocystis, Pseudoharpagon, Sawyeria.
- Stephanopogonidae Corliss 1961. Stephanopogon.
- Creneidae Pánek et al. 2014. Creneis.
- Tulamoebidae Kirby et al. 2015. Pleurostomum, Tulamoeba.
Euglenozoa Cavalier-Smith 1981, emend. Simpson 1997
- Euglenida Butschli 1884, emend. Simpson 1997. Uncertain genera: †Moyeria Thusu 1973.
- Petalomonadida Cavalier-Smith 1993. Atraktomonas*, Biundula*, Calycimonas, Dolium, Dylakosoma*, Notosolenus, Pentamonas*, Petalomonas, Scytomonas, Sphenomonas, Tropidoscyphus*.
- Alistosa Lax & Simpson 2021. Ploeotia, Serpenomonas, Keelungia, Lentomonas, Decastava.
- Entosiphon Cavalier-Smith, Chao & Vickerman 2016
- Gaulosia Lax, Cho & Keeling 2023
- Karavia Lax, Cho & Keeling 2023. Hemiolia, Liburna.
- Olkaspira Lax & Simpson 2021.
- Chelandium Lax, Cho & Keeling 2023
- Olkasia Lax, Lee, Eglit & Simpson 2019
- Spirocuta Cavalier-Smith, Chao & Vickerman 2016
- Anisonemia Cavalier-Smith 2016
- Peranemidae Bütschli 1884 (P). Chasmostoma, Jenningsia , Peranema, Teloprocta, Urceolus .
- Euglenophyceae Schoenichen 1925, emend. Marin & Melkonian 2003
- Rapaza Yamaguchi et al. 2012
- Eutreptiales Leedale 1967, emend. Marin & Melkonian 2003. Eutreptia, Eutreptiella.
- Euglenales Leedale 1967, emend. Marin & Melkonian 2003
- Phacaceae Kim et al. 2010. Discoplastis, Lepocinclis, Phacus.
- Euglenaceae Dujardin 1841, emend. Kim et al. 2010. Ascoglena, Colacium, Cryptoglena, Euglena, Euglenaformis, Euglenamorpha, Euglenaria, Euglenopsis, Hegneria, Klebsina, Monomorphina, Strombomonas, Trachelomonas.
- Diplonemea Cavalier-Smith 1993, emend. Simpson 1997
- Symbiontida Yubuki et al. 2009. Bihospites, Calkinsia, Postgaardi.
- Kinetoplastea Honigberg 1963. Incertae sedis taxa: ?Bordnamonas, ?Cephalothamnium, ?Rhynchoidomonas.
- Prokinetoplastina Vickerman in Moreira et al. 2004. Ichthyobodo, Perkinsela.
- Metakinetoplastina Vickerman in Moreira et al. 2004
- Neobodonida Vickerman in Moreira et al. 2004. Actuariola, Avlakibodo, Azumiobodo, Cruzella, Cryptaulaxella, Dimastigella, Klosteria, Neobodo, Phanerobia, Rhynchobodo, Rhynchomonas.
- Parabodonida Vickerman in Moreira et al. 2004. Cryptobia, Jarrellia, Parabodo, Procryptobia, Trypanoplasma.
- Eubodonida Vickerman in Moreira et al. 2004. Bodo.
- Trypanosomatida Kent 1880, emend. Vickerman in Moreira et al. 2004. Angomonas, Blechomonas, Leptomonas, Paratrypanosoma, Sergeia, Strigomonas, Wallaceina, Phytomonas, Trypanosoma.
Orphan groups
CRuMs Brown et al. 2018
Provora Tikhonenkov et al. 2022
Genera of uncertain affiliation
Acinetactis, Actinastrum, Actinocoma, Actinolophus, Adinomonas, Aletium, Amphimonas, Amylophagus, Aphelidiopsis, Asterocaelum, Asthmatos, Aurospora, Barbetia, Berkeleyaesol, Belaria, Belonocystis, Bertarellia, Bertramia, Bodopsis, Boekelovia, Branchipocola, Camptoptyche, Chalarodora, Cibdelia, Cichkovia, Cinetidomyxa, Cingula, Cladomonas, Clathrella, Codonoeca, Coelosporidium, Copromonas, Cyanomastix, Cyclomonas, Cytamoeba, Dallingeria, Dictyomyxa, Dimastigamoeba, Dinemula, Dinoasteromonas, Diplocalium, Diplomita, Diplophysalis, Diploselmis, Dobellina, Ducelleria, Ectobiella, Elaeorhanis, Embryocola, Endamoeba, Endemosarca, Endobiella, Endomonas, Endospora, Enteromyxa, Eperythrocytozoon, Errera, Fromentella, Gweamonas, Gymnococcus, Gymnophrydium, Haematotractidium, Hartmannina, Heliobodo, Heliomonas, Hermisenella, Heterogromia, Hillea, Hyalodaktylethra, Immanoplasma, Isoselmis, Janickina, Kamera, Labyrinthomyxa Dubosq 1921, Lagenidiopsis, Liegeosia, Luffisphaera, Lymphocytozoon, Lymphosporidium, Macappella, Magosphaera, Malpighiella, Martineziella, Megamoebomyxa, Meringosphaera, Microcometes, Monochrysis, Monodus, Mononema, Myrmicisporidium, Naupliicola, Nephrodinium, Neurosporidium, Orbulinella, Ovicola, Palisporomonas, Pansporella, Paradinemula, Parakaryon, Paraluffisphaera, Paramonas, Paraplasma, Parastasia, Parastasiella, Peliainia, Peltomonas, Petasaria, Phagodinium, Phanerobia, Phloxamoeba, Phyllomitus, Phyllomonas, Physcosporidium, Pleuophrys, Pleuromastix, Protenterospora, Protomonas, Pseudoactiniscus, Pseudosporopsis, Rhizomonas, Rhynchodinium, Rigidomastix, Schewiakoffia, Sergentella, Serpentoplasma, Sphaerasuctans, Spongastericus, Spongocyclia, Stephanomonas, Strobilomonas, Tetradimorpha, Thaulirens, Topsentella, Toshiba, Trichonema, Urbanella.
See also
Notes
- The first eukaryotes were “neither plants, animals, nor fungi”, hence as defined, the Protista would include the earliest common ancestor of all eukaryotes.
- In the original 4-kingdom model proposed in 1959, Protista included all unicellular microorganisms such as bacteria.
- ^ This taxon belongs to the paraphyletic phylum Apusozoa Cavalier-Smith 1997 emend. 2013.
- ^ There are two competing phylogenetic hypotheses: Teretosporea (Corallochytrium + Ichthyosporea) and Pluriformea (Corallochytrium + Syssomonas). This article follows the latter hypothesis, because it is strongly supported by the most recent phylogenetic studies.
- The term "Choanozoa" has been used since 1991 by Cavalier-Smith as a paraphyletic assemblage of opisthokont protists, and the terms "Apoikozoa" and "choanimal" were proposed as names for the clade Metazoa+Choanoflagellata. However, these terms have not been formally described or adopted, and were rejected in favour of a renamed Choanozoa to fit the clade Metazoa+Choanoflagellata.
- The position of the genera Microcorycia, Parmulina, Penardochlamys and Zonomyxa, which were listed in 2002 under family Microcoryciidae, is not clear. They are placed here by morphological characters but this needs to be supported by molecular data.
- The latest revision by Adl et al. (2019) ignores the grouping of some variosean genera into higher rank clades that was made in older studies because of the weakly supported SSU phylogenetic analyses, except for Fractovitellida, which is fully supported by phylogenomic analyses from 2017.
- ^ This order was initially divided into families, but phylogenetic analyses haven't supported the monophyly of each family. For this reason, in recent classifications there is no family rank division within it.
- This genus grouped with Dermamoebidae in a phylogenetic anaysis that used a limited number of taxa. In the recent taxonomy it was listed as a separate clade until its position is better resolved. A 2023 analysis placed it, once again, related to Dermamoebida in a clade with Microglomus.
- Both genera group together in some phylogenetic analyses, but usually appear separated. They were considered only a potential branch of Discosea, unless proven otherwise. A 2023 analysis places both genera in Flabellinia, closely related to Thecamoebida.
- This genus could be a synonym of Vannella.
- Latest analyses show that Microheliella is the sister group to Cryptista.
- Telonemia is the sister group to the SAR clade.
- The picobiliphytes are phylogenetically closer to Rhodophyta and Rhodelphis than to other groups, and are therefore considered part of Archaeplastida.
- Within the order Anoecida, the four families Anoecaceae, Caecitellaceae, Cafeteriaceae and Symbiomonadaceae were included by T. Cavalier-Smith in 2006. In a 2013 revision, he simplified the classification by transferring Symbiomonadaceae and Anoecaceae to Cafeteriaceae. However, both of those families remain accepted by the scientific community as independent from Cafeteriaceae as of 2020.
- ^ Cavalier-Smith hypothesized in 2013 a sister relationship between actinophryids and raphidophytes, with both groups placed under the taxon Raphidomonadea. The molecularly uncharacterized genus Commation was classified as part of this taxon. However, the placement of actinophryids among ochrophytes is still unstable and uncertain, and Commation has never been included in classifications since.
- O'Kelly placed the genera Antarctosaccion, Chrysomeris, Chrysonephos, Nematochrysis/Chrysowaernella, Phaeosaccion and Rhamnochrysis in the order Chrysomeridales nomen nudum in 1989, and Cavalier-Smith placed it inside the class Chrysomeridophyceae (spelt originally as Chrysomerophycea) in 1995. However, the class was proven to be polyphyletic. As a result, some of its genera (Nematochrysis/Chrysowaerella) were transferred to the class Chrysoparadoxophyceae, while others (Antarctosaccion and Phaeosaccion) were transferred to the class Phaeosacciophyceae. Due to a lack of molecular data, the placement of Chrysomeris, Chrysonephos and Rhamnochrysis remains unknown.
- The position of Eustigmatophyceae is still unstable, with different phylogenetic methodologies showing affinities to either of the SI and SII clades.
- ^ The taxonomic ranks above class level (phylum, subphylum, infraphylum, etc.) are unstable within the Alveolata, due to the many different existing classifications. For example, the phylum-level rank has been traditionally assigned to Perkinsozoa, Dinoflagellata, Chromerida and Apicomplexa, all of which have been classified as phylum Myzozoa, which in turn has been classified inside phylum Miozoa. Treating the four myzozoan groups as separate phyla is generally accepted among phycologists, while at the same time the rejection of higher taxonomic ranks due to being superfluous is prevalent among protistologists.
- Apart from morphological descriptions, no molecular analysis has solidly affiliated Rastrimonas with the Perkinsozoa.
- The genera Parallobiopsis, Ellobiocystis and Rhizellobiopsis are only provisionally placed among ellobiopsids.
- Highly divergent 18S rRNA.
- This taxon is artificial; many of the families listed in it are not monophyletic and have little support from phylogenetic analyses.
- There is only one molecular sequence from this genus, which causes long branches in gene phylogenies, and the node is unresolved.
- According to Nakamura & Suzuki, the only extant (i.e. not extinct) orders of Polycystinea are Spumellaria, Nassellaria, Collodaria and Orodaria. Therefore, Entactinaria is considered an exclusively fossil group.
- The genus Tetragonidium is known only from one written diagnosis and some illustrations, and its affinities with Cryptophyceae are very uncertain.
- Probably a synonym of the zygomycete fungus Nephridiophaga.
- Labyrinthomyxa, a genus of putative labyrinthulomycetes, is placed incertae sedis because of limited data.
- May be the same genus as Belonocystis.
- It is not yet known whether this organism is an eukaryote or a prokaryote.
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