The following groups contain protists. The clade Opisthokonta also contains the animals and the fungi, and the Archaeplastida also contains plants.
Cavalier-Smith's classification
Thomas Cavalier-Smith and his collaborators use a fully rank-based classification of protists. Here is their classification, non-protists are shown in bold:
(P?) Potentially paraphyletic or polyphyletic taxon.
(=...) Taxonomic synonym.
(...) Same taxon in a different code of nomenclature.
Amorphea
The supergroup Amorphea contains very diverse heterotrophic organisms, from the macroscopic fungi and animals to the unicellular choanoflagellates and classical amoebae. They frequently exhibit the ability to produce multinucleated cells, a trait considered ancestral to Amorphea. They are also capable of producing pseudopodia, as does the closely related CRuMs clade, forming the clade Podiata.
Amorphea is divided into two clades: Amoebozoa, containing well-known amoebae and slime molds, and Obazoa, containing animals, fungi, and their closest relatives. The relationship between these two clades was initially called 'Unikonta', due to a hypothesis where their common ancestor was a unikont, i.e., a eukaryote with just one flagellum. However, this hypothesis was refuted, as there are bikont amorpheans (e.g., Breviata anathema) and it likely is not an ancestral trait to have a single flagellum.
The clade Obazoa contains two small groups of flagellates, the breviates and the apusomonads, and
the large clade Opisthokonta, which contains animals, fungi, and their closest protist relatives. Under the Cavalier-Smith system, breviates and apusomonads were two classes that composed the phylum Apusozoa, but this taxon is paraphyletic, as apusomonads are more closely related to opisthokonts. The taxonomy of apusomonads was expanded in a 2022 phylogenetic study that introduced many new genera.
Class BreviateaCavalier-Smith 2004, order BreviatidaCavalier-Smith 2004. Genus not assigned to any family: Lenisia.
Opisthokonts are divided into two branches: Holozoa (animal-related), containing the ichthyosporeans, pluriformeans, filastereans and choanoflagellates; and Nucletmycea or Holomycota (fungus-related), containing the nucleariids and opisthosporidians. These groups, minus opisthosporidians, were classified as different classes within the paraphyletic phylum Choanozoa in the system of Cavalier-Smith, now obsolete. Instead, Choanozoa is the name used for the clade containing choanoflagellates and animals. Opisthosporidians (aphelids, rozellids and microsporidians) are often studied as protists, but are also considered fungi by protistologists and mycologists alike. Both Holozoa and Nucletmycea have been proposed once as superkingdoms by a group of mycologists who classified nucleariids and fungi as kingdoms, but without any mention of holozoan kingdoms.
NucletmyceaBrown et al. 2009 (=Holomycota Liu et al. 2009)
Cladogram of the major groups of Amoebozoa based on an 824-gene phylogenetic analysis published in 2022.
The phylum Amoebozoa contains around 2,400 species of primarily amoeboid protists. It includes a large portion of the traditional Sarcodina, the taxon uniting all amoebae. In particular, it groups naked and testate lobose amoebae (the traditional Lobosa), as well as the archamoebae and eumycetozoans (slime molds), and a few flagellates. After the general 2019 revisions published by the International Society of Protistologists (ISOP), there have been specific revisions to the classification of eumycetozoans and testate amoebae.
Order Protosteliida (Protosteliales) L.S.Olive & Stoian. 1966 sensu Shadwick & Spiegel in Adl et al. 2012, family Protosteliidae (Protosteliaceae) L.S.Olive & Stoian. 1966, genus Protostelium (incl. Planoprotostelium).
Order FractovitellidaLahr et al. 2011 sensu Kang et al. 2017
EumycetozoaZopf 1884 sensu Kang et al. 2017 (=Mycetozoa de Bary 1859 ex Rostafinski 1873, Macromycetozoa Fiore-Donno 2010)
Class DictyosteleaLister 1909 sensu Sheikh et al. 2018 (Dictyosteliomycetes Doweld 2001). Genus unassigned to any order: Synstelium. Genus incertae sedis: Coenonia.
Class Ceratiomyxomycetes (Ceratiomyxea) D. Hawksw., B. Sutton & Ainsw. 2019, order ProtosporangiidaShadwick & Spiegel in Adl et al. 2012 (Ceratiomyxales G.W. Martin ex M.L. Farr & Alexop.)
The clade Archaeplastida encompasses photosynthetic eukaryotes whose chloroplasts are derived from an event of primary endosymbiosis with a cyanobacterium. This includes the multicellular land plants (embryophytes), distinguished by their embryonic development and differentiation into tissues, and a multitude of protist lineages, many of which have also evolved multicellularity independently (e.g., red algae). Together, they amount to an estimated 500,000 species, with protists covering less than 50,000. In some systems of classification, Archaeplastida is equivalent to the plant kingdom (Plantae). As such, the protist lineages, including simple, single-celled algae and protozoa, are regarded as "plants" under this definition. Other definitions exclude these protists, and reduce the plant kingdom to only embryophytes.
Cladogram showing the relationships between red algal classes, according to a 2017 phylogenomic analysis.
The red algae, formally known as phylum Rhodophyta, are a group of more than 7,100 species of photosynthetic eukaryotes containing primary plastids. They have evolved into diverse morphologies, from single coccoid cells to large pseudoparenchymatousthalli that have complex life cycles with up to three generations. Unlike other eukaryotes, they lack flagella and centrioles in all their life stages.
Traditionally, red algae have been classified according to morphology as two classes (Bangiophyceae and Florideophyceae), or two subclasses (Bangiophycidae and Florideophycidae) of a single class Rhodophyceae. This system was challenged with the rise of molecular phylogenetics, which revealed the paraphyly of Bangiophyceae. In addition, a third class, Cyanidiophyceae, was discovered as the earliest diverging lineage. In 2004 a new molecular-based classification of red algae was proposed, where they composed a subkingdom of plants (Rhodoplantae) divided into two phyla: Cyanidiophyta, with just one class, and Rhodophyta, with three subphyla (Rhodellophytina, Metarhodophytina and Eurhodophytina) and four classes, one of which was still paraphyletic. In 2006, a comprehensive molecular analysis revised the classification and proposed a single phylum Rhodophyta with two subphyla: Cyanidiophytina, with one class, and Rhodophytina, with six classes. This taxonomic system, developed by Hwan Su Yoon and collaborators, is the prevalent among taxonomists, with the addition of a separation of subphylum Rhodophytina into two subphyla Proteorhodophytina and Eurhodophytina in 2017. In 2022, a book was published revising the classification of all freshwater red algae.
Cladogram of Chloroplastida with focus on the classes of green algae, based on 2019–2023 phylogenetic studies. Prasinophytes are marked *.
The green algae are a paraphyletic group from which land plants (Embryophyta) evolved. Together they form the clade Chloroplastida (in reference to their green plastids), also known as Viridiplantae (meaning "green plants"). Green algae were originally studied as a single division Chlorophyta.
Prasinodermophyta
Division PrasinodermatophytaMarin & Melkonian in Li et al. 2020 (as Prasinodermophyta)
Order MonomastigalesR.E.Norris ex Marin & Melkonian 2010 (=Monomastigales Norris in Parker 1982 nomen nudum), family Monomastigaceae Marin & Melkonian 2010, genus Monomastix.
Class NephroselmidophyceaeCavalier-Smith 1993 emend. Yamaguchi 2011, order Nephroselmidales Nakayama, Suda, Kawachi & Inouye 2007, family Nephroselmidaceae Pascher 1913 ex Silva 1980, genus Nephroselmis.
Class PicocystophyceaeLopes dos Santos & Eikrem 2017, order Picocystales Lopes dos Santos & Eikrem 2017, family Picocystaceae Lopes dos Santos & Eikrem 2017, genus: Picocystis.
Class PseudoscourfieldiophyceaeCrépeault, C.Otis, Pombert, Turmel & Lemieu 2024, order PseudoscourfieldialesMelkonian 1990 ex Crépeault, C.Otis, Pombert, Turmel & Lemieu 2024, family PseudoscourfieldiaceaeMelkonian 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, genus Pseudoscourfieldia (=Pycnococcus).
Cladogram of Pancryptista based on 2020 and 2022 analyses.
The phylum Cryptista contains heterotrophic and photosynthetic single-celled flagellates. Its classification has undergone many changes through the years, and several conflicting systems and nomenclatures coexist. It was described by Thomas Cavalier-Smith in 1989 to unite two distinct groups of flagellates: the photosynthetic cryptomonads, and the heterotrophic goniomonads (respectively the two classes Cryptomonadea and Cyathomonadea). The name Cryptista was meant to be a synonym of Cryptophyta, the algal Phylum described by the same author in previous years. In 2004, he modified the classification of Cryptista to add two subphyla: Cryptomonada, containing the aforementioned classes (renamed as Cryptophyceae and Goniomonadea respectively), and Leucocrypta, containing the heterotrophic katablepharids. The next year, a separate group of authors proposed a different higher ranking for katablepharids as a phylum Kathablepharida or Phylum Katablepharidophyta, related to but independent from phylum Cryptophyta, with no mention of Cryptista. Between 2013 and 2015, Cavalier-Smith updated the classification once more by describing three new subphyla: Rollomonadia, containing the previous subphyla lowered to superclasses; Palpitia, containing the flagellate Palpitomonas bilix; and Corbihelia, containing picozoans, telonemids, and some heliozoan species (Heliomorpha and Microheliella). Corbihelia did not reach consensus: later analyses and revisions separated telonemids and picozoans as their own clades, and placed Heliomorpha in Cercozoa. However, the addition of Palpitomonas and the monophyly of Rollomonadia have been supported in other analyses.
Cryptista was redefined in the 2019 ISOP revision as the clade containing Palpitomonas, katablepharids, goniomonads and cryptomonads. However, this revision introduced yet another classification system that is contradictory with the previous ones. They proposed a single class Cryptophyceae uniting cryptomonads, goniomonads and katablepharids, and treated cryptomonads as a single order Cryptomonadales, although this does not follow scientific consensus: there are more cryptomonad orders (e.g., Pyrenomonadales, Tetragonidiales) and the name Cryptophyceae was already used for taxa that excluded katablepharids and often excluded goniomonads too. There has not been a new revision since.
Unlike with Heliomorpha, the genus Microheliella was genetically sequenced and its affinities have been resolved. In 2022, it was proposed as the sister group of Cryptista, in a clade known as Pancryptista.
Class CentroplasthelidaFebvre-Chevalier & Febvre 1984 (=Centrohelea Kühn 1926 sensu Cavalier-Smith in Yabuki et al. 2012; Centroheliozoa Dürrschmidt & Patterson 1987). Genera incertae sedis: Meringosphaera, Parasphaerastrum.
Order AcanthocystidaCavalier-Smith & von der Heyden 2007 emend. Shɨshkin & Zlatogursky 2018
Suborder MarophryinaCavalier-Smith in Yabuki et al. 2012, family MarophryidaeCavalier-Smith & von der Heyden 2007 emend. Shɨshkin & Zlatogursky 2018, genus Marophrys.
Suborder ChalarothoracinaHertwig & Lesser 1874 sensu Cavalier-Smith in Yabuki et al. 2012 emend. Shɨshkin & Zlatogursky 2018
Class PlatysulceaCavalier-Smith 2018 → order Platysulcida Cavalier-Smith 2018 → family Platysulcidae Shiratori, Nakayama & Ishida 2015. Sole genus: PlatysulcusShiratori, Nakayama & Ishida 2015.[clarification needed]
Bigyra
Bigyra was initially proposed as a phylum of heterotrophic protists closely related to the photosynthetic heterokonts (Ochrophyta). It contained three subphyla: Pseudofungi (oomycetes and hyphochytrids), Bigyromonada (free-living biflagellates), and Opalinata (large multi-flagellated gut symbionts). The phylum was proposed with a unifying characteristic, the presence of a flagellar transition zone with double helices or rings. This definition was later modified to exclude both Pseudofungi and Bigyromonada, and it was instead reduced to two different subphyla: Opalozoa (including Opalinata and bicosoecids) and Sagenista. Prior to this, Sagenista itself was also a phylum containing bicosoecids and labyrinthuleans, but it got reduced to only labyrinthuleans and a few flagellates.
The current definition of Bigyra is paraphyletic according to some phylogenetic analyses, with Sagenista more closely related to Gyrista. Despite its probable paraphyly, most taxonomists continue to use it, and it was recognized in the 2019 revision by the ISOP, which prioritizes monophyletic taxa. Its global classification was last revised by Cavalier-Smith in 2013 and 2018, while the specific class Placididea was revised in 2021, with new taxa described by Alexandra Rybarski and coauthors, and the classes Labyrinthulea and Opalinea were revised in-depth in the 2017 Handbook of the protists.
Subclass Bicosidia(P?)Cavalier-Smith in Cavalier-Smith & Chao 2006. Genera not assigned to any order: Halocafeteria, Cafileria.
Order Borokales (Borokida) Cavalier-Smith in Cavalier-Smith & Chao 2006, family Borokaceae (Borokida) Cavalier-Smith in Cavalier-Smith & Chao 2006, genus Boroka.
Order Anoecales(P?) (Anoecida) Cavalier-Smith 1997 Genus not assigned to any lower taxon: Bilabrum.
Family AnoecaceaeCavalier-Smith in Cavalier-Smith & Chao 2006, genus Anoeca.
Family Caecitellaceae (Caecitellidae) Cavalier-Smith in Cavalier-Smith & Chao 2006, genus Caecitellus.
Class LabyrinthuleaL.S.Olive 1975 ex Cavalier-Smith 1989 (Labyrinthulomycetes Arx 1970 ex Dick 2001) (='phylum' Labyrinthomorpha Page in Levine et al. 1980 (Labyrinthulomycota Whittaker 1969))
PirsonialesCavalier-Smith & Chao 2006 emend. Prokina et al. 2024. Genera not assigned to any lower taxon: BordeauxiaProkina et al. 2024; BullioniaProkina et al. 2024; FeodosiaProkina et al. 2024; KoktebeliaProkina et al. 2024.
HyphochytriomycetesICNSparrow ex M.W.Dick 1983 (HyphochytreaICZNCavalier-Smith 1986). Genus not assigned to any lower taxon: HyphochytriumKarling 1939.
ChrysoparadoxophyceaeWetherbee in Wetherbee et al. 2019 → order Chrysoparadoxales Wetherbee in Wetherbee et al. 2019 → family Chrysoparadoxaceae Wetherbee in Wetherbee et al. 2019. ChrysoparadoxaWetherbee in Wetherbee et al. 2019; NematochrysisPascher 1925 (=ChrysowaernellaGayral & Lepailleur 1971).
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.
Genera not assigned to any lower taxon: NeocolponemaGigeroff et al. 2023, LoeffelaGigeroff et al. 2023.
PhylumColponemidiaTikhonenkov et al. 2014 → class ColponemeaCavalier-Smith 1993, emend. Tikhonenkov et al. 2014 → order ColponemidaCavalier-Smith 1993 → family ColponemidaeCavalier-Smith & Chao 2004, genus ColponemaStein 1878.
Cladogram of Rhizaria based on a 2019 phylogenomic analysis.
Rhizaria is a clade that contains a wide variety of primarily amoeboid protists with fine (filose) pseudopodia. It is generally divided into two phyla: Cercozoa, which is composed of a heterogeneous mixture of free-living flagellates, testate amoebae, obligate intracellular parasites, and photosynthetic amoebae, among others; and Retaria, which includes the radiolarians and forams, two groups that have a rich and continuous fossil record over 500 million years long. Discovered only through molecular phylogenetics, Rhizaria is home to over 11,000 described species.
Cladogram of Cercozoa based on a 2026 phylogenomic analysis.
Cercozoa is a phylum of protists with extreme morphological diversity, ranging from small flagellates and amoeboflagellates, to testate amoebae, heliozoan- and radiolarian-like amoebae, and massive biomineralizing predators, as well as a few photosynthetic species. They are present abundantly in aquatic habitats and soils. Cercozoa contains two subphyla: Filosa, represented primarily by free-living lineages, and Endomyxa, which includes obligate intracellular parasites and free-living predators. Included in or related to Endomyxa are several clades known primarily from environmental sequences ('novel clades' 10, 11, 12), with only a few members formally described.
The classification below is based largely on the 2019 revision by Adl et al. and Cavalier-Smith et al. Adl et al. excludes Endomyxa and Skiomonadea from Cercozoa, but later works generally include them.
Order Glissomonadida(P)Howe & Cavalier-Smith in Howe et al. 2009 (Heteromitidae Kent 1880, emend. Mylnikov 1990, emend. Mylnikov & Karpov 2004). Genus not assigned to any family: Neuromorpha.
Class Imbricatea(P)Cavalier-Smith in Cavalier-Smith & Chao 2003, emend. Howe et al. 2011
Incertae sedis
Superorder Discomonada Cavalier-Smith in Cavalier-Smith, Chao & Lewis 2018, order Discomonadida Cavalier-Smith in Scoble & Cavalier-Smith 2014, family Discomonadidae Cavalier-Smith in Scoble & Cavalier-Smith 2014, genus Discomonas.
Order ReticulosidaCavalier-Smith in Cavalier-Smith & Chao 2003 emend. Bass et al. 2009, family FiloretidaeCavalier-Smith & Bass in Bass et al. 2009, genus Filoreta.
Cladogram of foraminifera based on a 2022 phylogenetic analysis.
The foraminifera, or forams, are a diverse group of single-celled aquatic amoebae, usually bearing an organic or calcareous wall, amounting to over 6,700 living species and many fossil taxa. They were originally classified as an order of protozoa (Foraminiferida) belonging to the now obsolete Granoreticulosa, along with other reticulose amoebae. Later they were separated into their own phylum by most protozoologists, although maintained as a class by micropaleontologists, until they were placed as a subphylum of phylum Retaria along with the Radiolaria. They are divided into three classes (or subclasses, when globally treated as a class): the paraphyletic monothalamids, containing amoebae with single-chambered organic walls and a few naked amoebae (e.g., the large xenophyophores); and the monophyletic Globothalamea and Tubothalamea, which evolved from monothalamids, each containing amoebae with multi-chambered tests, either organic or calcareous. Some alternate systems of dividing foraminifera into classes have been proposed, but none have gained consensus. The relationships of monothalamids remain a work in progress due to the limited amount of genetic data.
Foraminiferal classification was compiled numerous times through the 20th century, culminating in 1987 with the catalogue of foraminiferal genera published by paleontologists Alfred R. Loeblich Jr and Helen Tappan. Later, catalogues have been published individually for separate groups of foraminifera on the basis of morphology and ecology. Two classifications for exclusively agglutinated (organic-walled) foraminiferal genera were published in 2001 and 2014, and one classification for planktonic foraminifera was published in 2022.
Cladogram of Disparia based on a 2025 phylogenomic analysis.
Disparia is a clade that unites several predatory protists, namely the provorans, hemimastigotes, and two mysterious genera Meteora and Solarion. It was described in 2025 through phylogenomic analyses that accompanied the discovery of Solarion. Prior to these analyses, provorans, hemimastigotes and Meteora were considered 'orphan' taxa, with unstable phylogenetic positions. The first provoran, Ancoracysta twista, was briefly proposed to be related to Haptista. However, in 2024 there was already evidence of a close affinity between Meteora, hemimastigotes, and provorans. The phylum Caelestes, described in 2025, encompasses two monotypic genera of protists with a unique stalked extrusome used for immobilizing prey bacteria. Their morphology resembles that of celestial bodies, after which they are named. Only one of the genera, Solarion, is assigned to a family, and no classes or orders have been defined. Hemimastigotes are a small group composed of ten species of heterotrophs with a pellicle and numerous flagella. First identified in 1988, they remained an orphan group for decades due to the absence of genetic information, with taxonomists hypothesizing affinities to many different protists. In 2018, two hemimastigotes were successfully sequenced and a phylogenomic analysis revealed their deep-branching placement near Diaphoretickes. Between 2024 and 2025, a closer relationship with the clades Provora and Caelestes was resolved. Provorans compose two ancient phyla of predatory microbes and a total of eight described species. They are small, fast-swimming predators capable of consuming larger prey, but are easily confused with other protists due to their unremarkable appearance; they required meticulous study to be recognized.
The metamonads were first described by Pierre-Paul Grassé in the first volume of Traité de Zoologie, published in 1952, as the superorder Metamonadina or Anaxostylaria. They were originally composed of zooflagellates with four or more flagella, known as polymastigotes and hypermastigotes (e.g., Trichomonas, Oxymonas). These were later split into other groups such as the Parabasalia and Preaxostyla (over 260 and 140 species respectively), regarded as individual phyla. After rRNA phylogenetic analyses demonstrated their relatedness, the concept of metamonads was reintroduced by Cavalier-Smith as a monophyletic phylum Metamonada that includes both groups, as well as the anaerobic Fornicata (e.g., the free-living Carpediemonas and the parasitic Giardia; around 140 species). In this system, Preaxostyla is known as subphylum Anaeromonada, and Fornicata and Parabasalia are two infraphyla that belong to the subphylum Trichozoa. Still, some taxonomists retain the Parabasalia at a phylum level.
The classifications of Preaxostyla and Fornicata were last revised separately in the 2017 Handbook of the protists and the higher classification of Metamonada was revised by Cavalier-Smith in 2021. The classification of Parabasalia was completely updated in 2024. Two new smaller clades of metamonads have been described in addition: anaeramoebae and the 'BaSk' clade, containing barthelonids and skoliomonads. However, Parabasalia was treated as a separate phylum by the 2024 revision, instead of a member of phylum Metamonada.
Phylum MetamonadaGrassé 1952 emend.stat. n. Cavalier-Smith 2003
Cladogram of heterolobosean orders based on combined phylogenomic and 18S rRNA analyses published in 2025.
The phylum Heterolobosea contains around 170 species of amoebae, flagellates, and amoeboflagellates. It was initially established to unite two historically well-known amoeboid orders, Schizopyrenida (such as Naegleria fowleri, a human pathogen) and Acrasida (slime molds). Later, as more flagellates joined this grouping, the usage of Heterolobosea was split between two meanings: the more common usage applies to the entire clade, while the usage by Cavalier-Smith and collaborators was restricted to a paraphyletic class of "traditional" heteroloboseans, with the name Percolozoa used for the phylum instead. The first comprehensive phylogenomic study of Heterolobosea was published in 2025 by Tomáš Pánek and coauthors, resulting in its modern classification.
Phylum HeteroloboseaPage & Blanton 1985 sensu Hanousková et al. 2019 (=Percolozoa Cavalier-Smith 1991)
The phylum Euglenozoa is home to at least 2,000 described species of single-celled flagellates of very dissimilar lifestyles. It was originally proposed to group the euglenids (such as the photosynthetic Euglena) and the kinetoplastids (like the pathogenic Trypanosoma), usually studied separatedly; eventually it included diplonemids and symbiontids as well. Due to its share of photosynthetic species, traditionally regarded as algae, the phylum is also known as Euglenophyta by phycologists, and euglenids in particular were often studied as algae. Euglenids and kinetoplastids are the most diverse in terms of described species, although diplonemids may compose over 67,000 potential species. The classification of euglenozoans was summarized by Cavalier-Smith in 2016. A more phylogenetically precise revision of their classification was published in 2021 by Alexei Kostygov and coauthors, with newer clades and genera described in the following years, particularly of euglenids. Still, one group of euglenids, the paraphyletic "ploeotids", remains unresolved in the current classification, spread out across multiple clades.
Family RigifilidaeYabuki & Cavalier-Smith in Yabuki et al. 2012 genus RigifilaYabuki & Cavalier-Smith 2012.
Class GlissodisceaCavalier-Smith 2013 emend. 2021 → order MantamonadidaCavalier-Smith in Glücksman et al. 2011 → family MantamonadidaeCavalier-Smith in Glücksman et al. 2011, genus MantamonasGlücksman & Cavalier-Smith 2011.
The phylum Telonemia (telonemids) contains a few species of flagellates found in ocean and fresh waters worldwide. It was originally proposed in 2006 for Telonema, a genus of previously uncertain affinity. Under the Cavalier-Smith system, telonemids were initially classified as a class of Cryptista, but later analyses consistently recovered it as a separate group. Until 2019, only two species had been formally described, each belonging to a separate genus, but environmental DNA sequencing suggested there were many more species not yet described. Between 2022 and 2025, eight additional species were described along with three new genera, bringing the total number of species to ten.
↑The first eukaryotes were "neither plants, animals, nor fungi", hence as defined, the Protista would include the earliest common ancestor of all eukaryotes.
↑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 2019 revision by the ISOP ignores the grouping of some variosean genera into higher rank clades (orders and families) proposed in older studies, due to the weakly supported SSU rRNA phylogenetic analyses.
12According to a 2018 molecular study: "The genera Coriophyllum, Neohalosacciocolax and Pseudorhododiscus are currently assigned to the Palmariales but have yet to be included in a molecular phylogenetic context, and their associations within the Palmariales remain equivocal."
↑The picobiliphytes are phylogenetically closer to Rhodophyta and Rhodelphis than to other groups, and are therefore considered part of Archaeplastida.
↑The 2019 revision by the ISOP inaccurately stated that goniomonads are classified as "Cyathomonadacea Pringsheim 1944". The name Cyathomonadacea does not exist; Pringsheim only described the family Cyathomonadaceae based on the genus Cyathomonas, and later the order Cyathomonadales and class Cyathomonadea were described, each by different authors. However, as pointed out in 1993 by Gianfranco Novarino and Ian Lucas, this genus was based on a species that actually belonged to Goniomonas; since then, taxonomists have prioritized higher taxa named after it (Goniomonadaceae, Goniomonadales/adida, Goniomonadea) instead.
↑The genus Tetragonidium is known only from one written diagnosis and some illustrations, and its affinities with cryptomonads are very uncertain.
↑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.
↑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.
12The 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.
↑Highly divergent 18S rRNA. Since 2020 member of newly identified major apicomplexan subgroup Marosporida, putting together Aggregata octopiana Frenzel 1885, Merocystis kathae Dakin, 1911 (both Aggregatidae, originally coccidians), Rhytidocystis sp. 1 and Rhytidocystis sp. 2 Janouškovec et al. 2019 (Rhytidocystidae Levine, 1979, originally coccidians, Agamococcidiorida), and Margolisiella islandica Kristmundsson et al. 2011 (closely related to Rhytidocystidae)
↑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.
↑This taxon is artificial; many of the families listed in it are not monophyletic and have little support from phylogenetic analyses.
↑Whether Endomyxa is part of Cercozoa or not has been difficult to assess due to poor taxon sampling, but the most recent phylogenomic analyses support the inclusion of Endomyxa within Cercozoa.
↑The family Massisteriidae was originally placed in the order Leucodictyida, along with the family Leucodictyidae which included two genera Leucodictyon and Reticulamoeba. However, Leucodictyon has not been genetically sequenced and Reticulamoeba is not closely related to Massisteriidae.
↑A proposed suborder-level clade by Cavalier-Smith in 2018 named Fiscullina is not monophyletic because of uncultured tectofilosids.
↑One 18S rRNA phylogenetic analysis suggests that the genus Opisthomitus is affiliated with the family Pyrsonymphidae.
↑Regarding the classification of Retortamonadida, there is a disconnect between the Cavalier-Smith system and the system described by different authors in the Handbook of the protists and other studies. The order Retortamonadida was originally defined as two genera: Chilomastix and Retortamonas. In 2013, Cavalier-Smith modified the retortamonads to only include Retortamonas, and describing a separate order Chilomastigida for Chilomastix only, placed among the early branching Carpediemonas-like organisms. However, this has not yet been recognized by later studies from the other authors.
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