Between brackets is the number of accepted species
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2 Shows the number of accepted species within the taxon
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- Biota
- Kingdom Animalia
- Kingdom Archaea
- Kingdom Bacteria
- Kingdom Chromista
- Kingdom Fungi
- Kingdom Plantae
- Kingdom Protista accepted as Protozoa
- Kingdom Protozoa
- Subkingdom Eozoa
- Subkingdom Sarcomastigota
- Subkingdom Zoomastigophora accepted as Sarcomastigota
- Phylum Hemimastigophora
- Phylum Nebulidia
- Phylum Nibbleridia
- Phylum Protozoa incertae sedis
- Phylum Rhizopoda accepted as Sarcomastigota
- Phylum Sarcomastigophora accepted as Sarcomastigota
- Class Mastigophora accepted as Sarcomastigota
- Class Protozoa (awaiting allocation)
- Family Palisporomonadaceae
- Genus Aberisphaera Wan, 1991 †
- Genus Aboema Frenzel, 1897
- Genus Aboudaragina Nakkady, 1955 †
- Genus Abriolina Luperto, 1963 †
- Genus Acanthapophysia Popofsky, 1904
- Genus Acanthochiasmarium Popofsky, 1904
- Genus Acanthochiasmidium Popofsky, 1904
- Genus Acanthochiasmonium Popofsky, 1904
- Genus Acanthocyrta Schewiakoff, 1926
- Genus Acantholarcus Tedeschi, 1895 †
- Genus Acantholonche Popofsky, 1904
- Genus Acanthometron Popofsky, 1904
- Genus Acanthonia Popofsky, 1904
- Genus Acanthophlegma Schewiakoff, 1926
- Genus Acanthospongus Mast, 1910
- Genus Acanthostephanus Haeckel, 1879
- Genus Acarella Cohn, 1866
- Genus Acariaeum Perty, 1852
- Genus Acervulina Hanzawa, 1957 †
- Genus Acidophorus Stein, 1859
- Genus Acioniscium Rostafianski, 1874
- Genus Acipenserinus Costa, 1864
- Genus Acolonche Popofsky, 1904
- Genus Acomia Dujardin, 1841
- Genus Acomia Diesing, 1848
- Genus Acrobotrissa Popofsky, 1913
- Genus Actinastrum Haeckel, 1885
- Genus Actinelius Haeckel, 1865
- Genus Actinobdella Gönnert, 1935
- Genus Actinocoma Penard, 1903
- Genus Actinogonium Schomburgk, 1847
- Genus Actinolithis Ehrenberg, 1847
- Genus Actinoma Haeckel, 1861
- Genus Adelocyrtis Pantanelli, 1880
- Genus Adhaerentina Paalzow, 1936 †
- Genus Adherentina Spandel, 1909
- Genus Aegyria Claparède & Lachmann, 1858
- Genus Aeolides de Montfort, 1808
- Genus Agathaminoides Vangerow, 1963 †
- Genus Agathiphyllia Reuss, 1863
- Genus Aglenophrya Diesing, 1866
- Genus Aguayoina Bermudez, 1939
- Genus Akanthopeltis Pochmann, 1942
- Genus Aletium Trinchese, 1881
- Genus Allodictya Ehrenberg, 1872
- Genus Allotheca Ehrenberg, 1843
- Genus Alyscum Dujardin, 1841
- Genus Alyscum Diesing, 1848
- Genus Ammoconia Haeckel, 1889
- Genus Ammocycloloculina Maync, 1958 †
- Genus Ammolynthus Haeckel, 1889
- Genus Ammonautilus Parkinson, 1811
- Genus Ammonema Eimer & Fickert, 1899
- Genus Ammonicerina Costa, 1856
- Genus Ammosolenia Haeckel, 1889
- Genus Ammovaginulina Nakkady & Eissa, 1962 †
- Genus Amoebogromia Giard, 1900
- Genus Amoebophilus Hollande & Guilcher, 1945
- Genus Amoebosporidium Bonome, 1895
- Genus Amorphina Parker & Jones, 1857
- Genus Amphacanthus Dogiel, 1926
- Genus Amphicarydiscus Lipman, 1965 †
- Genus Amphicentria Ehrenberg, 1861
- Genus Amphiexis de Folin, 1885
- Genus Amphigramma Reinsch, 1877
- Genus Amphilarcus Tedeschi, 1895 †
- Genus Amphimetron Popofsky, 1904
- Genus Amygdalites Costa, 1839
- Genus Ancistrina Chejsin, 1930
- Genus Ancyrium Werneck, 1841
- Genus Andromeda Agassiz, 1844
- Genus Angulogavellinella Hofker, 1957 †
- Genus Angustofolliculina Silén, 1947
- Genus Anhymenia Fabre-Doumergue, 1888
- Genus Annulatospira Clark & Campbell, 1945 †
- Genus Annulite McClelland, 1835
- Genus Anomalosoma Loeblich & Tappan, 1961 †
- Genus Apgaria Stokes, 1884
- Genus Aphthomonas Stauffacher, 1916
- Genus Apionidium Perty, 1852
- Genus Apiopterina Zborzewski, 1834
- Genus Apiosoma Wandolleck, 1895
- Genus Aporiella Krassilstschik, 1909
- Genus Applinella Thalmann, 1942
- Genus Aproctomus Rafinesque, 1820
- Genus Apsiphora Langer, 1991 †
- Genus Arachnidiopsis Penard, 1918
- Genus Arachnospongus Mast, 1910
- Genus Arachnothauma Zacharias, 1906
- Genus Archaecyclina Silvestri, 1910
- Genus Archaelagena Howchin, 1888
- Genus Arcyrella Rostafianski, 1875
- Genus Arcyrioides Morgan, 1893
- Genus Arduorhiza Wentzel, 1889
- Genus Arenarium Agassiz, 1843
- Genus Arenovirgulina Said & Barakat, 1958 †
- Genus Arethusa de Montfort, 1808
- Genus Arhabdomonas Fisch, 1885
- Genus Aristeropora Ehrenberg, 1858
- Genus Aristerospira Ehrenberg, 1858
- Genus Armilla Rafinesque, 1815
- Genus Arthrocena Soldani, 1791
- Genus Arthronema Eschscholtz in Kotzebue, 1828
- Genus Arthronema Eschscholtz, 1825
- Genus Ascoidium Braun, 1887
- Genus Ascosporidium Zacharias, 1898
- Genus Asecta Popofsky, 1913
- Genus Asellicola Plate, 1888
- Genus Askopsis de Folin, 1881
- Genus Aspidiscopsis Ghosh, 1921
- Genus Aspidodexia Ehrenberg, 1872
- Genus Aspidomma Haeckel, 1862
- Genus Aspidospira Ehrenberg, 1844
- Genus Aspidospirus Ehrenberg, 1844
- Genus Aspironympha Cleveland & Day, 1958
- Genus Astathes Gistl, 1848
- Genus Asterodiscocyclina Berry, 1928 †
- Genus Asterodiscus Ehrenberg, 1839
- Genus Asterosphaera Reitlinger, 1957 †
- Genus Astraphidokrates Gistl, 1848
- Genus Astrococcura Sutton, 1895
- Genus Astrogonium Francé, 1893
- Genus Astrorhizopsis de Folin, ? 1885
- Genus Astrorhizopsis de Folin, ? 1882
- Genus Astrotium Morgan, 1894
- Genus Astylon Endlicher, 1836
- Genus Ataxogyroidina Marie, 1941
- Genus Ataxophragmoides Brotzen, 1948 †
- Genus Athecocyclina Vaughan & Cole in Cushman, 1940
- Genus Atlanticella Borgert, 1906
- Genus Atractolina Schlicht, 1870
- Genus Atractospira de Folin, 1883
- Genus Auerinella Frenguelli, 1954
- Genus Aulancora Haeckel, 1879
- Genus Aulax Gourret & Roeser, 1888
- Genus Aulaxella Strand, 1928 †
- Genus Aulocerium Parks, 1909 †
- Genus Aulocoryne Fowler, 1899
- Genus Aulographis Haeckel, 1884
- Genus Aulographium Haeckel, 1879
- Genus Aulokleptes Immermann, 1903
- Genus Aulopetasus Haecker, 1908
- Genus Aulophyton Immermann, 1904
- Genus Aulostomella Alth, 1850
- Genus Auriculina Costa, 1856
- Genus Autonomos de Folin, ? 1885
- Genus Autonomos de Folin, ? 1882
- Genus Avellana Paulsen, 1931
- Genus Awerintzevia Schouteden, 1906
- Genus Bacillaria Oken, 1815
- Genus Bacterioidomonas Künstler, 1884
- Genus Baeonidium Perty, 1849
- Genus Balanitozoon Stokes, 1886
- Genus Balantioides Alexeieff, 1931
- Genus Balanulina Rzehak, 1888
- Genus Balbiania Blanchard, 1885
- Genus Balladinopsis Ghosh, 1921
- Genus Ballodora Dogiel & Furssenko, 1926
- Genus Balononema Kahl, 1931
- Genus Baphonulines Zborzewski, 1843
- Genus Barbetia Dangeard, 1886
- Genus Barroussia Schneider, 1885
- Genus Barrouxia Labbé, 1899
- Genus Bathybiopsis de Folin, ? 1882
- Genus Bathybiopsis de Folin, ? 1885
- Genus Bathybius Huxley, 1868
- Genus Bathymyxum Nusbaum-Hilarowicz, 1915
- Genus Bathyopsis Folin, 1884
- Genus Bathysphaera Hollande & Enjumet, 1960
- Genus Begia Smout, 1956 †
- Genus Beisselina Voloshinova & Balakhmatova, 1959 †
- Genus Belaria Epstein, 1941
- Genus Benedenia Foettinger, 1881
- Genus Bernardinella Pascher, 1922
- Genus Beroetta Cleve, 1899
- Genus Bertarellia Carini, 1930
- Genus Besnoitia Franco & Borges, 1916
- Genus Bicellum Strother & Wellman in Strother et al., 2021 †
- Genus Bifidellus Rafinesque, 1815
- Genus Biflagella Zimmerman & Brown, 1952
- Genus Bimulticavea Schafhäutl, 1863
- Genus Biorbulina Blow, 1956 †
- Genus Biporosononion Mamedova, 1965 †
- Genus Birbalina Sahni, 1955 †
- Genus Bithurammina Miklukho-Maklay, 1963 †
- Genus Blanchardia Wierzejski, 1890
- Genus Blanchardina Labbé, 1899
- Genus Blastosporidium Hartman & Schoo, 1914
- Genus Blephalax Rafinesque, 1815
- Genus Blephurus Rafinesque, 1815
- Genus Blobula Rafinesque, 1832
- Genus Blophastoma Rafinesque, 1820
- Genus Bolbodium Ehrenberg, 1872
- Genus Bommeria Pascher, 1922
- Genus Borelia Sorrentino, 1934
- Genus Borrellina Paillot, 1926
- Genus Bostrychosaria Vologdin, 1958 †
- Genus Brachyonus
- Genus Bradya Carter, 1877
- Genus Bradyinelloides Mamet & Pinard, 1992 †
- Genus Branchiocystis Burchardt, 1900
- Genus Branchiophaga Mazzarelli, 1905
- Genus Branchipocola Breindl, 1925
- Genus Broeckella Sherborn, 1893
- Genus Bruguieria Prever, 1902 †
- Genus Bruguièria Prever, 1902 † accepted as Bruguieria Prever, 1902 †
- Genus Bryophrya Kahl, 1931
- Genus Buccinina Costa, 1861
- Genus Buccinis Ledermüller, 1761
- Genus Bulbrodinium Wetzel, 1960 †
- Genus Buliminopsis Rzehak, 1895
- Genus Bulinella Penard, 1907
- Genus Bundleia Strelkow, 1939
- Genus Buningia Finlay, 1939
- Genus Bursalinus Kalmus, 1929
- Genus Cadium Bailey, 1856
- Genus Cadiumella Strand, 1928 †
- Genus Caduceia Kirby, 1936
- Genus Caementella Borgert, 1909
- Genus Caenomophina Blochmann, 1898
- Genus Calatharia Zalesski, 1927 †
- Genus Calcaria Gruber, 1879
- Genus Calcaromma Thomson, 1877
- Genus Calceolus Diesing, 1866
- Genus Calcisphaera Dawson, 1881
- Genus Calcisphaere Sherborn, 1902
- Genus Calia Werneck, 1841
- Genus Callyntrochlamys Frenzel, 1885
- Genus Caloneme Morgan, 1893
- Genus Calospeira G. Arnaud, 1949
- Genus Camerina Rafinesque, 1815
- Genus Cameroconus Meunier, 1888
- Genus Campbellella Loeblich & Tappan, 1961 †
- Genus Campylopus Claparède & Lachmann, 1857
- Genus Cannacantha Baeckel, 1879
- Genus Cannophysa Haeckel, 1888
- Genus Cannorhaphis Haeckel, 1879
- Genus Cannosphaera Haeckel, 1879
- Genus Canopus Montfort, 1808
- Genus Cantharipes Agassiz, 1846
- Genus Canthropes Montfort, 1808
- Genus Canthropus Oken, 1815
- Genus Capillicephalus Tuzet & Ormières, 1952
- Genus Caprina Mazzarelli, 1906
- Genus Capriniana Strand, 1928 †
- Genus Carbasaria Dalyell, 1853
- Genus Carcerinia Martius, 1817
- Genus Cariniella Pinto, 1926
- Genus Carpanoplasma Santos Dias, 1953
- Genus Carpolithis Ehrenberg, 1847
- Genus Caryoletira Kirby, 1944
- Genus Caryolithis Ehrenberg, 1847
- Genus Caryoryctes Calkins, 1904
- Genus Cashia Oye, 1926
- Genus Castellania Paul in Castellani, 1914
- Genus Catharia Leidy, 1874
- Genus Caudamoeba Faust, 1923
- Genus Caullerya Chatton, 1907
- Genus Celibs Sherborn, 1893
- Genus Cenospongodiscus Lipman, 1960 †
- Genus Ceophonus Bosc, 1816
- Genus Cephalodella Bory de St. Vincent, 1827
- Genus Cephalolithis Ehrenberg, 1847
- Genus Cephalorhynchus Diesing, 1866
- Genus Cephinus Rafinesque, 1815
- Genus Cepinulina Schafhäutl, 1851
- Genus Cepiopterines Zborzewski, 1843
- Genus Cerataria Zalessky, 1926 †
- Genus Ceratidium Ehrenberg, 1838
- Genus Ceratospirulima Ehrenberg, 1858
- Genus Ceratotintinnus Kofoid & Campbell, 1939
- Genus Cercidina Vogler, 1941 †
- Genus Cerobalana Agassiz, 1846
- Genus Cerona Agassiz, 1846
- Genus Chaetomonas Ehrenberg, 1832
- Genus Chaetoproteus Stein, 1857
- Genus Chaetotrochus Ehrenberg, 1866 †
- Genus Chalazodes Parks, 1908 †
- Genus Challengeria Thomson, 1877
- Genus Chasmostoma J. Massart, 1920
- Genus Chasmostomum Massart, 1920 accepted as Chasmostoma J. Massart, 1920
- Genus Chatterjeeia Rodríguez López-Neyra & Suárez Peregrin, 1933
- Genus Chaunosphaera Loeblich & Tappan, 1961 †
- Genus Checchiaites Sorrentino, 1934
- Genus Cheiramina de Folin, 1881
- Genus Cheiropsis de Folin, 1881
- Genus Cheissinella Meier, 1954
- Genus Chelibs Montfort, 1808
- Genus Chichkovia Valkanov, 1934
- Genus Chilodinium Conrad, 1926
- Genus Chilodon Agassiz, 1846
- Genus Chiloma Agassiz, 1846
- Genus Chilomma Ehrenberg, 1847
- Genus Chitinosperma Meunier, 1910
- Genus Chitonicium Plate, 1899
- Genus Chlamidodon Ehrenberg, 1836
- Genus Chlamidophora Ehrenberg, 1856
- Genus Chlamidophora Ehrenberg, 1876
- Genus Chlamydamoeba Collin, 1912
- Genus Chlamydobotris Korschikov, 1924
- Genus Chlamydobundleia Strelkow, 1939
- Genus Chlamydodon Agassiz, 1846
- Genus Chloramoeba Lagerheim, 1897
- Genus Chlorogoniella Schmidle, 1903
- Genus Chloropeltis Stein, 1878
- Genus Chlorophacus Pochmann, 1942
- Genus Chlorotriangulum Pascher, 1922
- Genus Chondropus Greeff, 1873
- Genus Chondrostagon Babudieri, 1932
- Genus Chondrostes Gistl, 1848
- Genus Chordoperculinoides Arni, 1965 †
- Genus Chromatella Frenzel, 1891
- Genus Chromatophagus Kerbert, 1884
- Genus Chromyomma Jørgensen, 1900
- Genus Chrysophidia Morgan, 1893
- Genus Cibotarella Brustur, 1991 †
- Genus Cidaria Grzybowski, 1896
- Genus Cidarollus Montfort, 1808
- Genus Ciliospina Leegaard, 1915
- Genus Cimelidium Ehrenberg, 1859
- Genus Cinetidomyxa Chatton & Lwoff, 1924
- Genus Cingula Averincev, 1916
- Genus Circoporetta Haecker, 1906
- Genus Circosphaera Haeckel, 1879
- Genus Circus Voloshinova & Budasheva, 1961 †
- Genus Cirrolus Martins, 1821
- Genus Cistidium Gamble in Lankester, 1909
- Genus Cithoryctes Stiles & Hassall, 1925
- Genus Citoryctes Guarnieri, 1892
- Genus Claparèdia Diesing, 1866 accepted as Claparedia Diesing, 1866
- Genus Clathroides Adanson, 1763
- Genus Clathroïdes Adanson, 1763 accepted as Clathroides Adanson, 1763
- Genus Claudiostriatella Seiglie & Bermüdez, 1965 †
- Genus Clavula de Folin, 1881
- Genus Clevea Balech, 1948
- Genus Clevelandia Kidder, 1937
- Genus Climacocylis Kofoid & Campbell, 1939
- Genus Clypeocyclina Silvestri, 1910
- Genus Clyphogonium Reinsch, 1877
- Genus Clypoleum Gourret & Roeser, 1888
- Genus Coccidiopsis Sokoloff, 1913
- Genus Coccosphaera Haeckel, 1894
- Genus Coccudina Bory de St Vincent, 1827
- Genus Cochleamoeba Schneider, 1887
- Genus Cochlearia Fauré-Fremiet, 1905
- Genus Cochleatina Bykova, 1956 †
- Genus Cochliella Jørgensen, 1924
- Genus Codonelloides Kofoid & Campbell, 1939
- Genus Codonopsis Kofoid & Campbell, 1939
- Genus Codonosiga Stein, 1878
- Genus Coelacantha Hertwig, 1879
- Genus Coelanthemum Haecker, 1907
- Genus Coelechinus Haecker, 1904
- Genus Coelocystis Ghelelovitch, 1947
- Genus Coelodiceras Haecker, 1907
- Genus Coelomoplasma Brumpt, 1938
- Genus Coelopodium Popofsky, 1926
- Genus Coelotetraceras Haecker, 1907
- Genus Coelothyrsus Haecker, 1907
- Genus Coenicosphaera
- Genus Colnicosphaera
- Genus Colobidium Perty, 1852
- Genus Colpoda Gmelin in Linnaeus, 1790
- Genus Colpodopsis Gourret & Roeser, 1888
- Genus Colpopleura Ehrenberg, 1844
- Genus Cometodendren Swarczewsky, 1928
- Genus Companulina Misik, 1973 †
- Genus Concharium Haeckel, 1879
- Genus Conchoceras Haeckel, 1879
- Genus Conchocystis Haecker, 1908
- Genus Conchophacus Haecker, 1906
- Genus Conchopsis Haeckel, 1879
- Genus Conchularia Weisse, 1844
- Genus Condylostoma Ehrenberg, 1831
- Genus Condylostoma Dujardin, 1841
- Genus Conicocornuspira Marie in Deleau & Marie, 1961 †
- Genus Coniocyclis Fol, 1881
- Genus Coniocylis Fol, 1881
- Genus Conocaryomma Lipman, 1965 †
- Genus Conocella Haas, 1978 †
- Genus Cononympha Oshima, 1917
- Genus Conorbina Brotzen, 1935 †
- Genus Consobrinella Mamet & Pinard, 1992 †
- Genus Convallarina Bory de St. Vincent, 1823
- Genus Copramoeba Lobeck, 1940
- Genus Cordylosoma Roth, 1909
- Genus Corethria Wright, 1859
- Genus Cormyomma Haeckel, 1862
- Genus Cornucella Borgert, 1907
- Genus Cortalus Montfort, 1808
- Genus Corticella Ehrenberg, 1872
- Genus Corythomelissa Campbell, 1951 †
- Genus Coscinosphaera Stuart, 1866
- Genus Coskinolinella Delmas & Deloffre, 1961 †
- Genus Coskinolinopsis Henson, 1948 †
- Genus Cosmella Nordmann, 1845
- Genus Craigia Calkins, 1915
- Genus Craspedonotana Strand, 1928
- Genus Craspedonotus Kahl, 1926
- Genus Craspedophrya Rieder, 1936
- Genus Craspedothorax Sondheim, 1929
- Genus Craterella Dons, 1942
- Genus Craterina Bory de St. Vincent, 1827
- Genus Crateriola Strand, 1943 †
- Genus Craterocyclas Haecker, 1908
- Genus Cretya Mingazzini, 1892
- Genus Cribroendothyra Lebedeva, 1956 †
- Genus Cribroparella Dam, 1948 †
- Genus Cribrospirella Marie, 1941
- Genus Cricocoleps Diesing, 1866
- Genus Crinisus Rafinesque, 1815
- Genus Criptocanalifera Krasheninnikov, 1960 †
- Genus Cristallosphaera Popofsky, 1912
- Genus Crossopyxis Ehrenberg, 1872
- Genus Cruciforma Popofsky, 1906
- Genus Crustula Allix, 1913
- Genus Cryptocystes Gurley, 1894
- Genus Cryptoplasma Chatton & Blanc, 1916
- Genus Cryptoprora Ehrenberg, 1847
- Genus Cryptostoma Fedele, 1927
- Genus Ctenoctophrys Weill, 1946
- Genus Cucurbitina Costa, 1856
- Genus Cupulites d'Orbigny, 1850 †
- Genus Curcurbitina Galloway, 1933
- Genus Curinostoma Kozloff, 1954
- Genus Cyathodinioides Cunha & Freitas, 1936
- Genus Cyclaster Mallory, 1904
- Genus Cyclasterella Castellani & Chalmers, 1913
- Genus Cyclasterion Mallory, 1905
- Genus Cyclochaeta Jackson, 1875
- Genus Cyclocyrrha Fabre-Domergue, 1888
- Genus Cyclolepidina Whipple, 1934
- Genus Cyclopoma Endlicher, 1836
- Genus Cycloposthium Strelkow, 1939
- Genus Cylastrum Ruest, 1898 †
- Genus Cylindropyxis Kufferath, 1932
- Genus Cylindrospira Folin, 1883
- Genus Cymatocylis Meunier, 1910
- Genus Cymricides Costa, 1839
- Genus Cyphidium Ehrenberg, 1836
- Genus Cypridium Kent, 1882
- Genus Cyprinaria Morren, 1829
- Genus Cyrtidium Bütschli, 1880
- Genus Cyrtolarcus Tedeschi, 1895 †
- Genus Cyrtostephanus Popofsky, 1913
- Genus Cyrtostomum Stein, 1859
- Genus Cysteodictyina Carter, 1880
- Genus Cystidina Volz, 1929
- Genus Cystidium Hertwig, 1879
- Genus Cystodiscus Lutz, 1889
- Genus Cystomonas Blanchard, 1886
- Genus Cystoplasma Lipschuetz, 1912
- Genus Cytharina d'Orbigny, 1842 †
- Genus Cythoryctes Stiles & Hassall, 1925
- Genus Cytoplasma Stiles & Hassall, 1925
- Genus Cytorhyctes Siegel, 1904
- Genus Cytorhyktes Stiles & Hassall, 1925
- Genus Cytorictes Stiles & Hassall, 1925
- Genus Cytorrhyctes Stiles & Hassall, 1925
- Genus Cytorrhyktes Stiles & Hassall, 1925
- Genus Cytorryktes Stiles & Hassall, 1925
- Genus Cytoryctes Stiles & Hassall, 1925
- Genus Cytoryktes Stiles & Hassall, 1925
- Genus Cytosporon Danilewsky, 1891
- Genus Cytozoon Danilewsky, 1891
- Genus Dactylina Zborzewski, 1843
- Genus Dactylophorus Schneider, 1887
- Genus Danilewskya Labbé, 1894
- Genus Dasystera Rafinesque, 1815
- Genus Deflandastrum Combaz, 1962 †
- Genus Delopora von Hagenow in Geinitz, 1851
- Genus Dendracantha Massera Bottazi, 1964
- Genus Dendropela Folin, 1883
- Genus Dendropela de Folin, 1887
- Genus Dentalen Ledermuller, 1763
- Genus Denticycloposthium Strelkow, 1939
- Genus Dermatosphaera Ehrenberg, 1860
- Genus Dermosporidium Marcone, 1908
- Genus Deropsis Rafinesque, 1815
- Genus Desmatocium Gabb, 1860
- Genus Desmomonas Williams, 1999
- Genus Diabolocampe Burma, 1959 †
- Genus Diaphanosoma Grandori, 1934
- Genus Diapora Bargatzky, 1881
- Genus Dicella Ehrenberg, 1841
- Genus Diceras Pascher, 1922
- Genus Diceratella Bory de St. Vincent, 1824
- Genus Diceratium Agassiz, 1846
- Genus Dicerratella Bory de St. Vincent, 1824
- Genus Dicorys Popofsky, 1913
- Genus Dictiomyxa Monticelli, 1897
- Genus Dictynna Morgan, 1894
- Genus Dictyocircus Jørgensen in Nordgaard & Joergensen, 1905
- Genus Dictyocoleps Diesing, 1866
- Genus Dictyolampra Schomburgk, 1847
- Genus Dictyolithis Ehrenberg, 1847
- Genus Dictyoplegma Haeckel, 1862
- Genus Dictyosoma Müller, 1856
- Genus Dictyosphagma Mivart, 1878
- Genus Dicycloposthium Strelkow, 1939
- Genus Didymophyes Frantzius, 1848
- Genus Digitalina Bory de St. Vincent, 1824
- Genus Dillina Munier-Chalmas & Schlumberger, 1883
- Genus Dimastigomastix Mello, Ganencar & Loundo, 1938
- Genus Dimorphiella Valkanov, 1928
- Genus Diodiathesis de Folin, ? 1885
- Genus Diodiathesis de Folin, ? 1882
- Genus Diphasia Fischer, 1823
- Genus Diplellipsis Popofsky, 1908
- Genus Dipleurostyla Roux, 1899
- Genus Diplocaryozoon Prowazek, 1913
- Genus Diplocystis Penard, 1890
- Genus Diplodinium Schuberg, 1888
- Genus Diplodinium Fiorentini, 1890
- Genus Diploglossa Morren, 1841
- Species Diploglossa purpurea C.J.E. Morren
- Genus Diplomasta de Folin, 1881
- Genus Diplomonadina Dangeard, 1902
- Genus Diplophysalis Zopf in Schenk, 1885
- Genus Diplosphaera Haeckel, 1860
- Genus Diplospyla Kellicott, 1885
- Genus Diplostoma Ebensberger, 1962 †
- Genus Diplurus Rafinesque, 1820
- Genus Discodella Weisse, 1845
- Genus Discoidina Terquem & Berthelin, 1875 †
- Genus Discolita Rafinesque, 1815
- Genus Discolithes Fortis, 1801
- Genus Discolithis Bronn, 1825
- Genus Discolithus Fortis, 1802
- Genus Discorbitus Rafinesque, 1815
- Genus Discorbula Lamarck, 1816
- Genus Disoma Ehrenberg, 1831
- Genus Disparospora Achmerov, 1954
- Genus Disphoeridium Trouessart, 1898
- Genus Displostauron Korschikov, 1926
- Genus Dispongia Popofsky, 1912
- Genus Distephanolithis Ehrenberg, 1860
- Genus Districha Fromentel, 1874
- Genus Distylocapsa Squinabol, 1904
- Genus Ditecium Rafinesque, 1815
- Genus Dorbignyaea Deshayes, 1830
- Genus Doryprunum Vinassa de Regny, 1898 †
- Genus Dorypyle Squinabol, 1904
- Genus Doxococcus Ehrenberg, 1830
- Genus Doyerius Ormancey, 1852
- Genus Drepanidium Ehrenberg, 1861
- Genus Drepanina Savi, 1913
- Genus Drepanoceras Stein, 1878
- Genus Drepanostoma Engelmann, 1862
- Genus Drilosphaera Granata, 1919
- Genus Druppalonche Hinde, 1899 †
- Genus Dujardinia Gray, 1858
- Genus Dumontia Künstler, 1885
- Genus Dyctyosoma Müller, 1856
- Genus Dyoxeia de Folin, 1881
- Genus Dysteropsis Roux, 1899
- Genus Echinocystis Bhatia & Chatterjee, 1925
- Genus Echinogromia Schroeder, 1907
- Genus Echinosphaera Hertwig, 1879
- Genus Ectobiella Bruyne, 1889
- Genus Ehrenbergius Ormancey, 1852
- Genus Eickenia Frenzel, 1891
- Genus Eilemammina de Folin, 1881
- Genus Elaeorhanis Greeff, 1873
- Genus Elaster Grimm, 1872
- Genus Eleaster Schmidt, 1913
- Genus Elenis Agassiz, 1844
- Genus Eliptophrya Kijenskii, 1926
- Genus Ellipotothigma Meier, 1954
- Genus Ellipsosiphongenerina Silvestri, 1923
- Genus Elliptina Harting, 1852
- Genus Embolium Endlicher, 1836
- Genus Enantioamphicoryna Marie, 1956 †
- Genus Enantiomarginulina Marie, 1941
- Genus Encheleis Scopoli, 1777
- Genus Enchelis O.F. Müller, 1773
- Genus Enchelys Nitzsch, 1817
- Genus Encorycium Ehrenberg, 1858
- Genus Endactis Rafinesque, 1820
- Genus Endomyxa Serbinov, 1916
- Genus Endophrys Przesmycki, 1901
- Genus Endothyrina Mikhailov, 1935 †
- Genus Endyomena Zopf in Schenck, 1884
- Genus Enigma G. Arnaud, 1949
- Genus Entamoebophaga Ivanic, 1936
- Genus Enteromyxa Cienkowsky in Schenk, 1884
- Genus Entocannula Haeckel, 1879
- Genus Entolagena Silvestri, 1900
- Genus Entoplasma Castellani, 1914
- Genus Eoalveolinella Silvestri, 1928 †
- Genus Eochernyshinella Lipina, 1965 †
- Genus Eodinina Eisenack, 1935 †
- Genus Eostaffellina Reïtlinger, 1963 †
- Genus Eotournayellina Lipina, 1965 †
- Genus Epiorella Kofoid & Campbell, 1939
- Genus Epipora Rafinesque, 1814
- Genus Epirhabdosella Campbell, 1942
- Genus Epistelis Ehrenberg, 1830
- Genus Epistomaria Kuwano, 1950 †
- Genus Epistominites Zalessky, 1927 †
- Genus Epistomonas Corda, 1838
- Genus Eretes Werneck, 1841
- Genus Errera Schouteden, 1907
- Genus Ervilia Dujardin, 1841
- Genus Ervilia Dujardin, 1840
- Genus Erysibe Nees, 1817
- Genus Erythrocytonucleophaga Ivanic, 1934
- Genus Erythrocytozoon Lestoquard & Donatien, 1937
- Genus Estrella Frenzel, 1893
- Genus Ethmosphaera Haeckel, 1861
- Genus Euarcella Deflandre, 1928
- Genus Eubodo Diesing, 1848
- Genus Eucadium Ehrenberg, 1872
- Genus Eucharteria Schmidle, 1903
- Genus Euchelydium Kahl, 1930
- Genus Euchilomonas Diesing, 1848
- Genus Euchlamydomonas Schmidle, 1903
- Genus Euchondrioderma Lister, 1894
- Genus Eucormos Endlicher, 1836
- Genus Eucorycium Ehrenberg, 1858
- Genus Eucraterium Morgan, 1896
- Genus Eucribraria Rostafinski, 1875
- Genus Eucryptomon Diesing, 1848
- Genus Eucryptomonas Diesing, 1848
- Genus Eucytis Morgan, 1896
- Genus Eudiderma Lister, 1911
- Genus Eudidymium Lister, 1911
- Genus Eudifflugia Diesing, 1848
- Genus Eumonas Diesing, 1848
- Genus Eumonodontophrya Heidenreich, 1935
- Genus Eumorpha Endlicher, 1837
- Genus Euodon Ehrenberg, 1834
- Genus Euperanema Diesing, 1848
- Genus Euperichaena Raunkiaer, 1888
- Genus Eupoterion MacLennan & Connell, 1931
- Genus Eurhabdonella Kofoid & Campbell, 1939
- Genus Eurhizostoma Haeckel, 1880
- Genus Euspironympha Day, 1945
- Genus Euuvella Diesing, 1848
- Genus Euxystonellopsis Kofoid & Campbell, 1939
- Genus Exassula Ehrenberg, 1872
- Genus Excentrica Paulsen, 1931
- Genus Exochiton de Folin, ? 1885
- Genus Exochiton de Folin, ? 1882
- Genus Falsodiscus Davydov, 1991 †
- Genus Fascicolites Carter, 1853 †
- Genus Favolagena Malumián, Náñez & Caramés, 1991 †
- Genus Favus Schafhäutl, 1850
- Genus Fenestracanthia Bertolini, 1937
- Genus Fibrillpbundleia Strelkow, 1939 †
- Genus Filigerina Schneider, 1887
- Genus Flagellipodium Bovee, 1951
- Genus Flexurella Vologdin, 1958 †
- Genus Flosculina Stache in Schwagger, 1883 †
- Genus Folius Soldani, 1791
- Genus Folliculus Meunier, 1910
- Genus Foramoeba Garcia, 1957
- Genus Forulina Schafhäutl, 1850
- Genus Frankeina Cushman & Alexander, 1929 †
- Genus Freia Claparède & Lachmann, 1858
- Genus Frondiculina Münster, 1835
- Genus Frondiculina Münster, 1838
- Genus Fujimotoella Morikawa, 1952 †
- Genus Fuligo Wiggers, 1780
- Genus Fusarchaias Reichel, 1949 †
- Genus Fyscosporidium Awerinzew, 1924
- Genus Gasterochaeta Diesing, 1850
- Genus Gastrochaeta Dujardin, 1841
- Genus Gastrochoeta Dujardin, 1840
- Genus Gastrotricha Wrzesniowski, 1867
- Genus Geleiella Stiller, 1939
- Genus Gemmulina d'Orbigny in Cuvier, 1838
- Genus Geophonus Montfort, 1808
- Genus Geopona de Blainville, 1824
- Genus Geoponus Ehrenberg, 1839
- Genus Gervaisius Ormancey, 1852
- Genus Geticella Dumitrica, 1965 †
- Genus Gillardella Štěpánek, 1963
- Genus Giroliarella Crespin, 1958 †
- Genus Glandiolus Montfort, 1808
- Genus Glenoclosterium Carter, 1869
- Genus Glenopanophrys Diesing, 1866
- Genus Glenotrochilia Diesing, 1866
- Genus Globanamalina Haque, 1956 †
- Genus Globicella Borgert, 1907
- Genus Globigerina Morozova, 1959 †
- Genus Globisipinum Popofsky, 1906
- Genus Globogyroidina Kaiho, 1992 †
- Genus Globulnia Costa, 1856
- Genus Gloidium Sorokin, 1878
- Genus Glomerina Franke, 1928 †
- Genus Glossa Gourret & Roeser, 1888
- Genus Glossatella Bütschli in Bronn, 1889
- Genus Goniocypris Brady & Robertson, 1870
- Genus Gonobia Mingazzini, 1892
- Genus Gordieriella Skvortzow, 1958
- Genus Gourisina Reichel, 1945
- Genus Grammobotrys Ehrenberg, 1844
- Genus Gregarella Chatton & Brachon, 1936
- Genus Gregarinoides Fantham, 1925
- Genus Gringa Frenzel, 1897
- Genus Guembelia Prever, 1902 †
- Genus Gumbelia Prever, 1902 † accepted as Guembelia Prever, 1902 †
- Genus Gümbelia Prever, 1902 † accepted as Guembelia Prever, 1902 †
- Genus Guttulidium Frenzel, 1892
- Genus Gymnococcus Zopf in Schenk, 1884
- Genus Gymnopharynx Diesing, 1866
- Genus Gymnopithus Kahl, 1926
- Genus Gyrammina Eimer & Fickert, 1899
- Genus Gyromorphina Marie, 1941
- Genus Haeckelella Khabakov, 1937 †
- Genus Haemamoeba Grassi & Feletti, 1890 accepted as Plasmodium Marchiafava & Celli, 1885
- Genus Haemapium Eisen, 1897
- Genus Haematococcus Morren, 1841
- Genus Haematomonas Osler, 1887
- Genus Haematophyllum Metschnikoff, 1887 accepted as Plasmodium Marchiafava & Celli, 1885
- Genus Haemiophrya Kent, 1882
- Genus Haemocytozoon Danilewsky, 1886
- Genus Haemoplasmodium Danilewsky, 1886
- Genus Haerina Munier-Chalmas, 1882 †
- Genus Haliphysema Haeckel, 1877
- Genus Halsis Stokes, 1889
- Genus Hantkenia Prever, 1902 †
- Genus Hantkenina Thalmann, 1942
- Genus Hantkeninella Brönnimann, 1950 †
- Genus Haplosphaera Hollande & Enjumet, 1960
- Genus Harmodirus Perty, 1852
- Genus Harpakter Burch, 1885
- Genus Hastigerinella Brönnimann, 1952 †
- Genus Hectina Bartenstein & Brand, 1949 †
- Genus Helcosoma Wright, 1903
- Genus Helichona Plate, 1888
- Genus Helicites Gesner, 1758 †
- Genus Helioamoeba Miller, 1923
- Genus Heliochallengeron Haecker, 1906
- Genus Heliocometes Sand, 1899
- Genus Heliomycopsis Arnaud, 1949
- Genus Heliophrynella Vejdovský, 1882
- Genus Heliophrys Greeff, 1873
- Genus Heliosestarium Campbell & Clark, 1944 †
- Genus Hemamoeba Labbé, 1899
- Genus Hemiarcyria Fries in Endlicher, 1836
- Genus Hemicrypta De Folin, 1883
- Genus Hemiholostiche Gelei, 1954
- Genus Hemiophrya Kent, 1882
- Genus Hemispeiropsis König, 1894
- Genus Hemistegina Kaufman, 1867 †
- Genus Hemisterea Ehrenberg, 1872
- Genus Hemisticta Ehrenberg, 1872
- Genus Hemoproteus Celli & San Felice, 1891
- Genus Hepatocytes Levaditi & Schoen, 1932
- Genus Herione Agassiz, 1844
- Genus Herpetosoma Doflein, 1901
- Genus Heterocornutanna Clark & Campbell, 1945 †
- Genus Heterocosmia Ehrenberg, 1872
- Genus Heterocysta Stein, 1883
- Genus Heterosoma Mast, 1910 †
- Genus Heterosphaera Mast, 1910
- Genus Heterosphaerina Mast, 1910
- Genus Heterospongus Mast, 1910
- Genus Heterostomum Ehrenberg, 1854 †
- Genus Hexagonocyclina Caudri, 1944 †
- Genus Hexalodus Haecker, 1908
- Genus Hexarhizites Haeckel, 1874
- Genus Hexcladus Vinassa de Regny, 1898 †
- Genus Hexonaspis Haeckel, 1885
- Genus Histiogregarina Raffaele, 1938
- Genus Histocystidium Goodchild, 1953
- Genus Histosporidium Feinberg, 1903
- Genus Hochbergia Shinn & McLean, 1989
- Genus Holocladina Carter, 1880
- Genus Holococcus Ehrenberg, 1858
- Genus Hologlypha Ehrenberg, 1872
- Genus Homoeochlamys Ehrenberg, 1872
- Genus Hoplarium Agassiz, 1846
- Genus Hovasiella Puytorac, 1955
- Genus Huxleya Claparède & Lachmann, 1858
- Genus Hyalolimax Brumpt & Lavier, 1935
- Genus Hyalophacus Pochmann, 1942
- Genus Hyalopus Schaudinn, 1894
- Genus Hybridina Kuebner & Zwingli, 1866
- Genus Hydromylina Witt Puyt, 1941 †
- Genus Hydrophrya Nozawa, 1938
- Genus Hymenostoma Stokes, 1884
- Genus Hyperaminopsis de Folin, ? 1885
- Genus Hyperaminopsis de Folin, ? 1882
- Genus Hypochthon Gistl, 1848
- Genus Hypocomatophora Jarocki & Raabe, 1932
- Genus Hystozoon Podwissozky, 1896
- Genus Iberina Munier-Chalmas, 1902 †
- Genus Ichthydium Ehrenberg, 1831
- Genus Ichthyofrondina Vachard in Vachard & Ferriere, 1991 †
- Genus Ichthyokrates Gistl, 1848
- Genus Iduna Claparède & Lachmann, 1860
- Genus Iliozotica de Folin, ? 1882
- Genus Ilyopegma de Folin, 1881
- Genus Ilyoperidia de Folin, 1881
- Genus Ilyosphaera de Folin, 1881
- Genus Ilyozotika de Folin, 1881
- Genus Immanoplasma Neumann, 1909
- Genus Inquilinium Rafinesque, 1815
- Genus Iodomonas Penso, 1932
- Genus Isolepidina Douvillé, 1915
- Genus Isselina Cépède, 1910
- Genus Isthmia Ehrenberg, 1854 †
- Genus Ixodioplasma Schmidt, 1904
- Genus Jigulites Rozovskaya, 1948 †
- Genus Julia de Folin, 1881
- Genus Jungia Oye, 1949
- Genus Kampiopsis de Folin, ? 1885
- Genus Kampiopsis de Folin, ? 1882
- Genus Kampylopter Pochmann, 1942
- Genus Karyamoeba Kofoid & Swezy, 1924
- Genus Karyamoeba Giglio-Tos, 1900
- Genus Karyamoebina Kofoid & Swezy, 1925
- Genus Karyoclastis Campbell, 1926
- Genus Karyonella Cabrera, 1957
- Genus Katachiton de Folin, ? 1885
- Genus Katachiton de Folin, ? 1882
- Genus Kerobalana Bory de St. Vincent, 1826
- Genus Kidderia Raabe, 1934
- Genus Kikrammina de Folin, 1881
- Genus Kiloma Losana, 1829
- Genus Kolpoda Müller, 1773
- Genus Kondyliostoma Bory de St. Vincent, 1826
- Genus Kordeella Vologdin, 1958 †
- Genus Lacazopsis Douvillé, 1931 †
- Genus Lachmanella Cépède, 1910
- Genus Lacroixella Haman, 1991 †
- Genus Lada Vejdovský, 1882
- Genus Ladopsis Cheisin, 1928
- Genus Laevepeneroplis Šulc, 1935
- Genus Lagenopsis Gregorio, 1930 †
- Genus Lagunculina Rhumbler, 1904
- Genus Laharpeia Prever, 1902 †
- Genus Lamellina Bory de St. Vincent, 1826
- Genus Laminiuva Vella, 1961 †
- Genus Lapidium Morgan, 1896
- Genus Larcodiscus Tedeschi, 1895 †
- Genus Larvella Morgan, 1894
- Genus Latericia Schafhäutl, 1850
- Genus Lebedevaella Vologdin, 1958 †
- Genus Lecquereusia Schlumberger, 1845
- Genus Lecythia Wright, 1861
- Genus Lecythina Dangeard, 1912
- Genus Lecythodytes Dangeard, 1908
- Genus Leiocraterium Rostafinski, 1875
- Genus Leionata Wresniowski, 1869
- Genus Lekithiamina de Folin, 1881
- Genus Lekithiammina de Folin, 1887
- Genus Lepidella Zacharias, 1906
- Genus Lepista Zalessky, 1927 †
- Genus Leptoclava Budde, 1927
- Genus Leptodermella Rhumbler, 1935
- Genus Leptodesmus Zacharias, 1903
- Genus Leptoglena Grassé & de Boissezon, 1929
- Genus Lequereusia Doflein, 1928
- Genus Lesquereusia Agassiz, 1846
- Genus Leucophrydium Roux, 1899
- Genus Leukocytozoon Ziemann, 1898
- Genus Leydenia Schaudinn, 1896
- Genus Liegeoisia Chatton in Grassé, 1953
- Genus Limnias Oken, 1815
- Genus Limnophrya Zacharias, 1892
- Genus Limocaecum de Folin, 1881
- Genus Limocoecum de Folin, 1881
- Genus Lincolaria Cristofori & Jan, 1832
- Genus Linendothyra Mamet & Pinard, 1992 †
- Genus Lineola von Baer, 1827
- Genus Lineolaria Münster in Ansted, 1844 †
- Genus Linguloglandulina Silvestri, 1903
- Genus Linthuris Montfort, 1808
- Genus Linthurus Sherborn, 1893
- Genus Liosiphon Ehrenberg, 1853
- Genus Liostephania Schomburgk, 1847
- Genus Liriope Gegenbaur, 1856
- Genus Lithacanthus Popofsky, 1907
- Genus Lithamoeba Lankester, 1879
- Genus Lithocorys Ichikawa, 1950 †
- Genus Lithocorythium Ehrenberg, 1847
- Genus Litholophus Haeckel, 1860
- Genus Lithophyllium Müller, 1858
- Genus Lithophyllum Müller, 1859
- Genus Lithosphaerella Frenzel, 1892
- Genus Lithozoa Folin, 1885
- Genus Litosolenus Stokes, 1893
- Genus Litriolites Swainson, 1835
- Genus Lituosepta Cati, 1959 †
- Genus Lobularia Costa, 1839
- Genus Lobularia Hitchcock, 1878
- Genus Loeschia Chatton & Lalung-Bonnaire, 1912
- Genus Longicauda Korotneff, 1880
- Genus Longicilium Milne, 1883
- Genus Longlinia Yang & Hao, 1991 †
- Genus Lonkashkina Skvortzow, 1958
- Genus Lophoctenia Bourne in Lankester, 1900
- Genus Lophomonas Grassi, 1885
- Genus Loschia Chatton & Lalung-Bonnaire, 1912 accepted as Loeschia Chatton & Lalung-Bonnaire, 1912
- Genus Löschia Chatton & Lalung-Bonnaire, 1912 accepted as Loeschia Chatton & Lalung-Bonnaire, 1912
- Genus Luffisphaera Belcher & Swale, 1975
- Genus Lycophris Montfort, 1808
- Genus Lymphocystis Woodcock, 1904
- Genus Lymphocytozoon Ross, 1912
- Genus Lymphohaematocytozoon Mayer, 1913
- Genus Lymphohamatocytozoon Mayer, 1913 accepted as Lymphohaematocytozoon Mayer, 1913
- Genus Lymphohämatocytozoon Mayer, 1913 accepted as Lymphohaematocytozoon Mayer, 1913
- Genus Lymphosporidium Calkins, 1900
- Genus Lyozoom Leber & Prowazek in Prowazek, 1911
- Genus Lyrina Zborzewski, 1834
- Genus Lythocorythium Bütschli, 1881
- Genus Macrocercus Nitzsch in Ersch & Gruber, 1827
- Genus Macrodites Montfort, 1808
- Genus Macrophrya Kijenskii, 1925
- Genus Macroxystonellopsis Kofoid & Campbell, 1939
- Genus Magnella Neumann, Pozaryska & Vachard, 1975 †
- Genus Malameba Taylor & King, 1937
- Genus Malca Gistl, 1848
- Genus Mallopela de Folin, 1881
- Genus Mallopela de Folin, 1887
- Genus Malpighiella Minchin, 1910
- Genus Mandlius Ormancey, 1852
- Genus Marenda Nyholm, 1951
- Genus Margaritina Schwager in Waagen, 1888 †
- Genus Mastichemonas Diesing, 1848
- Genus Mastigamoebula Fantham, 1919
- Genus Mastigostephanus Levander, 1893
- Genus Mazosphaera Ehrenberg, 1860
- Genus Megalodictys Morgan, 1894
- Genus Megamoebomyxa Nyholm, 1952
- Genus Megathyra Ehrenberg, 1843
- Genus Megatricha Perty, 1852
- Genus Melanella Bory de St. Vincent, 1827
- Genus Mendesia Petri, 1962 †
- Genus Meniscostomum Kent, 1881
- Genus Mesopora Ehrenberg, 1854 †
- Genus Mespilina Agassiz, 1843
- Genus Metaheleopera Bartoš, 1963
- Genus Metameronympha Koidzumi, 1915
- Genus Metaradiophyra Heidenreich, 1935
- Genus Metaschwagerina Minato & Honjo, 1958 †
- Genus Metastephanonympha Mello & Brito, 1929
- Genus Meteora Hausmann, Weitere, Wolf & Arndt, 2002
- Genus Metopides Quennerstedt, 1867
- Genus Metromonas Larsen & Patterson, 1990
- Genus Meyenella Davis, 1950 †
- Genus Mezenia Stuckenberg, 1895 †
- Genus Microamoeba Reich, 1933
- Genus Microbion Barykin & Kritsch, 1923
- Genus Micrococcidium Druener, 1894
- Genus Microfolliculina Dons, 1928
- Genus Microgromia Hertwig, 1874
- Genus Microhydrella Frenzel, 1891
- Genus Microklossia Krassilstschik, 1905
- Genus Microlecitos Issel, 1891 †
- Genus Micromitra Delphy, 1938
- Genus Micropithus Kahl, 1926
- Genus Micropoculum Dons, 1922
- Genus Microrhibdulus Deflandre, 1959 †
- Genus Microscopistes Dujardin, 1836
- Genus Microsol Dons, 1918
- Genus Microsoma Lebedeff & Tscharnotzky, 1911
- Genus Microsporidia Moniez, 1887
- Genus Microsporidyopsis Schereschewsky, 1925
- Genus Microzyma Béchamp, 1867
- Genus Microzymas Labbé, 1899
- Genus Miculopodium Hadži, 1940
- Genus Mikrogromia Saedeleer, 1934
- Genus Mikroklossia Krassilstschik, 1902
- Genus Miliolis Oken, 1817
- Genus Millettella Rhumbler, 1904
- Genus Mirga Gregorio, 1930 †
- Genus Misilus Montfort, 1808
- Genus Mitra Quennerstedt, 1867
- Genus Mitrarium Alexeieff, 1912
- Genus Mitrocystis Pinto, 1927
- Genus Moellerina Schellwien, 1898 †
- Genus Molnaria Zalessky, 1927 †
- Genus Molybdis Pachinger, 1886
- Genus Monadendron Pascher, 1942
- Genus Monadites Matthew, 1890
- Genus Monadopsis Klein, 1882
- Genus Monaxonium Popofsky, 1912
- Genus Monetulites Ehrenberg, 1856
- Genus Monobia Schneider, 1878
- Genus Monobidia Cockerell, 1909
- Genus Monoderma Rostafinski, 1875
- Genus Monogenerina Spandel, 1901
- Genus Monohyla Schweigger, 1820
- Genus Monomastigocystis Saedeleer, 1930
- Genus Monopodium Mereschkowsky, 1880
- Genus Monostylus Cayeux, 1897 †
- Genus Monotubus Popofsky, 1913
- Genus Morgania Kahl, 1934
- Genus Morularia Bruyne, 1889
- Genus Mucilago Adanson, 1763
- Genus Mullerius Ormancey, 1852
- Genus Mulsantius Ormancey, 1852
- Genus Multicyclina Cushman, 1918 †
- Genus Multilepidina Hanzawa, 1932
- Genus Mycetomyxa Zacharias, 1893
- Genus Mycodinium Averinzev, 1916
- Genus Mydeplasmodium Guibert, 1958
- Genus Myiobium Swellengrebel, 1919
- Genus Myriophrys Penard, 1897
- Genus Myrtilina Bory de St. Vincent, 1827
- Genus Mystacodella Bory de St. Vincent, 1827
- Genus Myxastrum Haeckel, 1868
- Genus Myxobrachia Haeckel, 1869
- Genus Myxodictyum Haeckel, 1868
- Genus Myxodiscus Prowazek, 1900
- Genus Myxodyctium Bütschli in Bronn, 1880
- Genus Myxophyllum Raabe, 1933
- Genus Myxosporidium Korotneff, 1892
- Genus Nannochloris Pascher, 1911
- Genus Nathella Singh, 1953
- Genus Nationaletta Borgert, 1906
- Genus Nautilina Costa, 1856
- Genus Nautilita Soldani, 1789
- Genus Nematodozoon Gistl, 1848
- Genus Nematopoda Sand, 1901
- Genus Neoactinomyxum Granata, 1922
- Genus Neobalkhania Cherchi, Radoicic & Schroeder, 1991
- Genus Neoorbitolites Ghose, 1959 †
- Genus Neopleneroplis Didkovsky, 1958 †
- Genus Neoseptaglomospiranella Lipina, 1965 †
- Genus Nephrocystidium Weissenberg, 1922
- Genus Neuroplasma Santos, 1934
- Genus Neuroryctes Williams, 1906
- Genus Neurosporidium Ridewood & Fantham, 1907
- Genus Nicollia Kritschewsky, 1922
- Genus Nivalia Bottazzi, 1965
- Genus Noctyocha Deflandre, 1949 †
- Genus Nodeola Rafinesque, 1815
- Genus Nodocyclina Heim, 1908 †
- Genus Nodoplanulis Hussey, 1943 †
- Genus Nodosarina Parker & Jones, 1859
- Genus Nodotes Spratt, 1854 †
- Genus Normania Cushman, 1928
- Genus Nubeculospira Simonelli, 1879
- Genus Nummularius Gesner, 1758 †
- Genus Nummulella Carus, 1832
- Genus Nummulostegina Schubert, 1907 †
- Genus Obeliscus Popofsky, 1913 †
- Genus Ocanthularia Sosnina, 1960 †
- Genus Ocyglossa Giard, 1904
- Genus Odontodictya Ehrenberg, 1872
- Genus Odontotintinnus Kofoid & Campbell, 1939
- Genus Oligostegina Kaufmann in Heer, 1865
- Genus Olivina Frenzel, 1897
- Genus Olympina Reichel, 1945
- Genus Oncobotrys Ehrenberg, 1856
- Genus Ondogordius Deleau & Marie, 1959 †
- Genus Onychodactylus Entz, 1884
- Genus Oospira Chatton & Lwoff, 1930
- Genus Oouramoeba Bütschli in Bronn, 1880
- Genus Ophidionella de Folin, 1881
- Genus Ophionella Kent, 1882
- Genus Ophisthodon Stein, 1859
- Genus Ophiurespira Chatton & Lwoff, 1930
- Genus Ophrydia Bory de St. Vincent, 1827
- Genus Ophrydium Ehrenberg, 1830
- Genus Ophryocerca Ehrenberg, 1832
- Genus Ophthalmoplanis Bory de St. Vincent, 1827
- Genus Oplarium Losana, 1829
- Genus Orbicula Defrance, 1825
- Genus Orbiculina Reeve, 1842
- Genus Orbignina Freyer, 1849
- Genus Orbitella Douvillé, 1915
- Genus Orbitocyclinoides Brönniman, 1944 †
- Genus Orbitulites Bronn in Bronn & Roemer, 1854
- Genus Orbulinella Entz, 1877
- Genus Orbulinoides Blow & Saito, 1968 †
- Genus Orbulites Lamarck, 1816
- Genus Orcheocystis Trinci, 1916
- Genus Orizaria Agassiz, 1844
- Genus Ormathascia Deák, 1964 †
- Genus Orobias Eichwald, 1860
- Genus Orobias Galloway & Harlton, 1928 †
- Genus Orthoceras Blainville, 1825
- Genus Orthoceros Da Costa, 1776
- Genus Orthochona André, 1910
- Genus Orthocornutanna Clark & Campbell, 1945 †
- Genus Oryzaria Agassiz, 1846
- Genus Otostomum Ehrenberg, 1872
- Genus Ouramoeba Leidy, 1874
- Genus Ovalveolina Reichel, 1935 †
- Genus Ovolina Terquem, 1866
- Genus Ovoplasma Raadt, 1913
- Genus Ovoplasma Marzinkowsky & Bogrow, 1904
- Genus Ovulida de Folin, 1887
- Genus Ovulina Gruber, 1884
- Genus Oxytricha Ehrenberg, 1830
- Genus Ozawaina Lee, 1927 †
- Genus Pachymyxa Gruber, 1883
- Genus Pachysoma Mingazzini, 1891
- Genus Pachysphaera Brandt, 1902
- Genus Pachysphaera Conil & Lys, 1964 †
- Genus Pachystroma Nicholson & Murie, 1878
- Genus Pacillina Cleve, 1899
- Genus Palaeacanthus Davis, 1950 †
- Genus Palaeovalvuloria Schubert, 1920 †
- Genus Palingenestes Gistl, 1848
- Genus Palmularia Defrance, 1825
- Genus Paludinicola Gistl, 1848
- Genus Paniculina Schafhäutl, 1850
- Genus Panophrys Dujardin, 1841
- Genus Panophrys Dujardin, 1840
- Genus Pantotrichum Ehrenberg, 1830
- Genus Parabolivina Resig, 1992
- Genus Parabradyina Mamet & Pinard, 1992 †
- Genus Parabursaria Ghosh, 1921
- Genus Paracenodiscus Krasheninnikov, 1960 †
- Genus Paracyathodinium Cunha & Freitas, 1944
- Genus Paradivergentia Paulsen, 1931
- Genus Paragonium Sokoloff & Ancona, 1937
- Genus Paralogopsis Handlirsch, 1911 †
- Genus Paraluffisphaera Esteban, Clarke & Finlay, 2005
- Genus Paramaecidium Savi, 1915
- Genus Paranebela Jung, 1942
- Genus Paranoplophyra Rohrbach, 1936
- Genus Paranyctotherus Sandon, 1941
- Genus Paraperanema Shawhan & Jahn, 1947
- Genus Paraplasma Seidelin, 1911
- Genus Parasubbotina Olsson, Hemleben, Berggren & Liu, 1992 †
- Genus Parasyniella Bykova, 1961 †
- Genus Paratrocholina Oberhauser, 1956 †
- Genus Paraxystonellopsis Kofoid & Campbell, 1939
- Genus Parenglypha Penard, 1902
- Genus Parfia Bistelius, Miklukho-Maklai & Ryabinin, 1953 †
- Genus Parundellopsis Kofoid & Campbell, 1939
- Genus Patevia Valkanov, 1931
- Genus Patilloides Leischner, 1959 †
- Genus Patrocla Bronn, 1848 †
- Genus Pauroleptus Wengel, 1953
- Genus Pecilia Lepeletier, 1822
- Genus Pectinaria Zalessky, 1926 †
- Genus Pedicellaria Berthold in Latreille, 1827
- Genus Peitiada Frenzel, 1891
- Genus Pelecida Dujardin, 1841
- Genus Pelekydion Eberhard, 1862
- Genus Peltierus Ormancey, 1852
- Genus Penardia Oye, 1923
- Genus Pentasolenia Ehrenberg, 1860
- Genus Pentasyderina Nicolucci, 1843
- Genus Perichaenella Raunkiaer, 1888
- Genus Pericometes Schneider, 1886
- Genus Peridasys Rafinesque, 1815
- Genus Perikaryon Chatton, 1911
- Genus Peripheres Carus, 1832
- Genus Periples Montfort, 1808
- Genus Perispira Haeckel, 1881 †
- Genus Perispirella Loeblich & Tappan, 1961 †
- Genus Petalopella Loeblich & Tappan, 1961
- Genus Petalopus Claparède & Lachmann, 1859
- Genus Petasia Morren, 1829
- Genus Petromonas Chodat, 1926
- Genus Phacites Gesner, 1758 †
- Genus Phacoplax Pascher, 1911
- Genus Phacopyle Dreyer, 1888
- Genus Phacothamnion Lagerheim, 1884
- Genus Phaenocystes Gurley, 1895
- Genus Phaeococcus Toni, 1891
- Genus Phaeocolla Haeckel, 1879
- Genus Phaeodella Haeckel, 1884
- Genus Phaeogloea Pascher, 1924
- Genus Phagodinium Kristiansen, 1993
- Genus Phanerostomum Ehrenberg, 1843
- Genus Phialina Costa, 1856
- Genus Phloxamoeba Bovee, 1951
- Genus Phoebea Modeer, 1792
- Genus Phragelliorhynchus Herrick, 1884
- Genus Phryanella Pénard, 1902
- Genus Phykopsis de Folin, ? 1882
- Genus Phykopsis de Folin, ? 1885
- Genus Phyllolonche Popofsky, 1904
- Genus Phyllopsammina Matecki, 1953 †
- Genus Physcosporidium Awerinzew, 1924
- Genus Physomphalus Ehrenberg, 1856
- Genus Physophaga Percy, 1929
- Genus Pileonella Morren, 1829
- Genus Pinaciocystis Roskin, 1929
- Genus Pinacocoleps Diesing, 1866
- Genus Pineina Schafhäutl, 1850
- Genus Pirhemocyton Chatton & Blane, 1914
- Genus Piridium Patten, 1936
- Genus Pirobodo Sangiorgi, 1922
- Genus Pirochroma Dschunkowsky, 1938
- Genus Pirolina Vauzème, 1834
- Genus Pirotrypanum Narro, 1927
- Genus Pissida Adanson, 1763
- Genus Placentia Morgan, 1894
- Genus Placentula Soldani, 1795
- Genus Placoidea Morris, 1936
- Genus Placolithes Broili in Zittel, 1910 †
- Genus Placolithis Ehrenberg, 1847 †
- Genus Plagiacantha Müller, 1856
- Genus Plagiocantha Wallich, 1862
- Genus Plagiotricha Bory de St. Vincent, 1827
- Genus Plakopus Schulze, 1875
- Genus Plakousa de Folin, ? 1882
- Genus Plakousa de Folin, ? 1885
- Genus Planariola Dujardin, 1841
- Genus Planiplotes Andrusova, 1886
- Genus Planorbites Lamarck, 1799
- Genus Planospira Rafinesque, 1815
- Genus Plasmoeba Eberle, 1904
- Genus Plasmosoma Huntemueller, 1914
- Genus Plateja Modeer, 1792
- Genus Platymonas Pascher, 1922
- Genus Platynema Kahl, 1931
- Genus Platyoecus Ehrenberg, 1854 †
- Genus Plavskina Reitlinger, 1960 †
- Genus Plectanella Morgan, 1893
- Genus Plectophorina Loeblich & Tappan, 1961 †
- Genus Plectophrys Entz, 1877
- Genus Pleospora Crivelli, 1870
- Genus Pleuraspis Pochmann, 1942
- Genus Pleurites Ehrenberg, 1854 †
- Genus Pleurospyris Ehrenberg, 1847
- Genus Pleurostomina Costa, 1862
- Genus Pleurostrema Ehrenberg, 1839
- Genus Pleurotrema Ehrenberg, 1839
- Genus Pliolepidina Douvillé, 1915
- Genus Pnylomorphina Bronn, 1848 †
- Genus Podactinelius Schroeder, 1907
- Genus Podarcella Giard, 1887
- Genus Podaxon Fries, 1829
- Genus Podosphaera Archer, 1868
- Genus Polimitus Danilesky, 1886
- Genus Polycarpum Stempell, 1901
- Genus Polycaryum Stempell, 1902
- Genus Polycoccon Sauerbrey, 1928
- Genus Polyflagellomonas Carpano, 1940
- Genus Polymitus Danilewsky, 1891
- Genus Polymoria Folin, 1887
- Genus Polymorphus Soldani, 1791
- Genus Polyphragma Reuss, 1871
- Genus Polyrabdina Mingazzini, 1891
- Genus Polyrhabdina Labbé, 1899
- Genus Polysiphonidia Eisenack, 1971 †
- Genus Polysphaerina Sherborn, 1896
- Genus Polystichia Pantanelli, 1880
- Genus Polythei Leigh-Sharpe, 1924
- Genus Polytricha Bory de St. Vincent, 1831
- Genus Polyxenes Montfort, 1808
- Genus Pomatograptus Haeckel, 1889 †
- Genus Poroamphora Popofsky, 1908
- Genus Poronaia Ujiié & Watanabe, 1960 †
- Genus Poropila Schiller, 1925
- Genus Porosonoion Putrya in Voloshinova, 1958 †
- Genus Porospira Ehrenberg, 1844
- Genus Porostephanus Haeckel, 1879
- Genus Porpita Soldani, 1789
- Genus Porpites Guettard, 1770
- Genus Praelamarckina Kaptarinko-Chernoussova, 1956 †
- Genus Praeuvigerina Hofker, 1951 †
- Genus Prantlitina Vašícek & Růžička, 1957 †
- Genus Prantlitinopsis Vašícek & Růžička, 1957 †
- Genus Premnammina Folin, 1881
- Genus Prismatium Haeckel, 1862
- Genus Prismozoon Burchardt, 1900
- Genus Proboscella Kent, 1881
- Genus Proclimacocylis Kofoid & Campbell, 1939
- Genus Proctamoeba Alexeieff, 1912
- Genus Prophysema Haeckel, 1889
- Genus Proreophax Ghose, 1959 †
- Genus Prorocyclina Vaughan & Cole in Cushman, 1940
- Genus Prorospira Agassiz, 1845
- Genus Prorotrichia Rostafinski, 1876
- Genus Prorotrichonympha Saleem, 1955
- Genus Protalector Gistl, 1848
- Genus Protamoeba Korotneff, 1880
- Genus Protarachne Gistl, 1848
- Genus Protastrum Grimm, 1876
- Genus Proterophacus Pochmann, 1942
- Genus Protoanoplophrya Miyashita, 1930
- Genus Protobalantidium Abé, 1929
- Genus Protobathybius Bessels, 1873
- Genus Protobatrachus Gistl, 1848
- Genus Protobios d'Herelle, 1924
- Genus Protocantharus Gistl, 1848
- Genus Protocobitis Gistl, 1848
- Genus Protocochliella Jörgensen, 1925
- Genus Protocyathus Ford, 1878 †
- Genus Protoentospora Sun, 1910
- Genus Protogenes Haeckel, 1865
- Genus Protoglobulimina Hofker, 1951
- Genus Protokyon Gistl, 1848
- Genus Protomonas Haeckel, 1866
- Genus Protomonas Cienkowsky, 1865
- Genus Protomys Gistl, 1848
- Genus Protoperidinium Stokes, 1888
- Genus Protoradiophrya Rossolimo & Perzowa, 1929
- Genus Protorhabdonella Kofoid & Campbell, 1939
- Genus Protosepiola Gistl, 1848
- Genus Protosphaera Cayeux, 1897 †
- Genus Protoxystonellopsis Kofoid & Campbell, 1939
- Genus Protozoon Gistl, 1848
- Genus Protravassosia Artigas & Unti, 1938
- Genus Proxystonella Kofoid & Campbell, 1939
- Genus Proxystonellopsis Kofoid & Campbell, 1939
- Genus Psammechinus Folin, 1881
- Genus Psammolychna de Folin, 1881
- Genus Psammoperidia de Folin, 1881
- Genus Psammophyllum Haeckel, 1889
- Genus Psammoscene Rhumbler, 1931
- Genus Psammozootica Folin, ? 1882
- Genus Psammozotika Folin, 1881
- Genus Pseudammochidium Hovasse, 1932
- Genus Pseudamphimonas Bruyne, 1889
- Genus Pseudamphinomas Bruyne, 1889
- Genus Pseudarkys de Folin, ? 1882
- Genus Pseudarkys de Folin, ? 1885
- Genus Pseudastraea Reuss, 1863
- Genus Pseudastrorhizula Wetzel, 1940 †
- Genus Pseudoamoeba Maddox, 1873
- Genus Pseudoastrorhiza Eisenack, 1934 †
- Genus Pseudocolpoda Ilowaisky, 1921
- Genus Pseudocormos Endlicher, 1836
- Genus Pseudodiderma Rostafinski, 1875
- Genus Pseudoglaucoma Wengel, 1953
- Genus Pseudogumbelina Brönnimann & Brown, 1953 †
- Genus Pseudohaemogregarina Awerinzew, 1941
- Genus Pseudojanischewskina Mamet & Pinard, 1992 †
- Genus Pseudolituola Marie, 1941
- Genus Pseudomallomonas Pascher, 1922
- Genus Pseudopalaeospiroplectammina Mamet & Pinard, 1992 †
- Genus Pseudopatellina Haque, 1960 †
- Genus Pseudopolypus Agassiz, 1843
- Genus Pseudopontigulasia Oye, 1956
- Genus Pseudospora Cienkowsky, 1865
- Genus Pseudosporidium Zopf in Schenk, 1884
- Genus Pseudostaurosphaera Krasheninnikov, 1960 †
- Genus Pseudostylis Endlicher, 1836
- Genus Psilotrix Gourret & Roeser, 1888
- Genus Psorospermium Eimer, 1870
- Genus Pteractis Ehrenberg, 1872
- Genus Ptychostomum Agassiz, 1846
- Genus Ptygostomum Ehrenberg, 1843
- Genus Ptyka Folin, 1881
- Genus Ptylostroma Dupont, 1883 †
- Genus Ptyxidium Perty, 1852
- Genus Pulsatella Geddes, 1881
- Genus Pupella Bory de St Vincent, 1827
- Genus Pupina Reuss in Geinitz, 1846
- Genus Pygmomyces Arnaud, 1949
- Genus Pygolimax Tyzzer, 1920
- Genus Pylosphaera Ehrenberg, 1858
- Genus Pyramidomonas Stein, 1878
- Genus Pyronema Dujardin, 1836
- Genus Pyrosoma Smith & Kilborne, 1893
- Genus Quadrimetron Popofsky, 1904
- Genus Quadristaurus Popofsky, 1904
- Genus Quasireichelina Ueno, 1992 †
- Genus Quataria Henson, 1948 †
- Genus Racemulina Étallon in Thurmann & Étallon, 1863
- Genus Radiolarites Matthew, 1890
- Genus Ramesella Vašícek, 1947 †
- Genus Ramešella Vašícek, 1947 † accepted as Ramesella Vašícek, 1947 †
- Genus Ranikothalia Arni, 1965 †
- Genus Raphidium Moniez, 1887
- Genus Raphidospora Léger, 1900
- Genus Rapistrum Soldani, 1791
- Genus Rauserites Rozovskaja, 1948 †
- Genus Rectogumbelina Cushman, 1932 †
- Genus Rectoseptabrunsiina Lipina, 1965 †
- Genus Rectotrochamminoides Fischer, 1954 †
- Genus Reitlingerella Vologdin, 1958 †
- Genus Renulinites Parkinson, 1811
- Genus Reophaxopsis de Folin, 1887
- Genus Retepora Soldani, 1795
- Genus Reussina Grzymium, 1896
- Genus Rexiella Morgan, 1896
- Genus Rhabdamminopsis Folin, 1883
- Genus Rhabdella Archiac & Haime, 1853 †
- Genus Rhabdocystis Arnaud, 1949
- Genus Rhabdodon Entz, 1884
- Genus Rhabdolithes Voeltzkow, 1902
- Genus Rhabdopleura Dawson, 1870
- Genus Rhabdotricha Greeff, 1888
- Genus Rhaphidococcus Haeckel, 1861
- Genus Rhaphidodendron Moebius, 1876
- Genus Rhaphidohelix Moebius, 1880
- Genus Rhaphidoscene Jennings, 1896
- Genus Rhaphimonas Kent, 1880
- Genus Rhaphiodendron Moebius, 1876
- Genus Rhaphiophorasphaera Clark & Campbell, 1945 †
- Genus Rhinella Bory, 1828
- Genus Rhipidocyclina Gümbel, 1868
- Genus Rhizopela de Folin, 1881
- Genus Rhizoplasma Verworn, 1896
- Genus Rhizoplectopsis Wetzel, 1961 †
- Genus Rhizosphaera Haeckel, 1860
- Genus Rhodanascia Deák, 1964 †
- Genus Rhopalocephalus Korotneff, 1893
- Genus Rhopalocyrtis Bütschli, 1881
- Genus Rhopalodictyum Ehrenberg, 1860
- Genus Rhumbleria Bürger, 1917
- Genus Rimelphidium Voloshinova, 1958 †
- Genus Rinella Bory de St. Vincent, 1827
- Genus Riyudhella Redmond, 1965 †
- Genus Ropalozotika Folin, 1881
- Genus Rosario Frenzel, 1893
- Genus Rosenia Waagen & Wentzel, 1886 †
- Genus Rosetta Popofsky, 1904
- Genus Rotulina Pourtalès, 1850
- Genus Rugipes Schaeffer, 1926
- Genus Sagena Haeckel, 1884
- Genus Sagenidium Haeckel, 1884
- Genus Saitoella Kaiho, 1992 †
- Genus Salamandraches Gistl, 1848
- Genus Salpistes Wright, 1859
- Genus Saltonella Frenzel, 1891
- Genus Saonea Rafinesque, 1815
- Genus Saracenella Franke, 1935 †
- Genus Sarcosporidium Gross, 1909
- Genus Sarella Frenzel, 1891
- Genus Saturnulus Haeckel, 1881
- Genus Sawayaella Marcus, 1939
- Genus Saxella Morgan, 1896
- Genus Saxicolina Deshayes, 1830
- Genus Scaniella Pflug, 1965 †
- Genus Schellwienia Staff & Wedekind, 1910 †
- Genus Scheviakovella Caullery & Mesnil, 1905
- Genus Schizamoeba Davis, 1927
- Genus Schizogenes Moniez, 1886
- Genus Schizomma Ehrenberg, 1860
- Genus Schizopus Claparède & Lachmann, 1858
- Genus Schlutzia Grimm, 1876
- Genus Schraderella Rostafinski, 1875
- Genus Schultzellina Cépède, 1910
- Genus Schultzia Grimm, 1876
- Genus Sciadostoma Kahl, 1926
- Genus Scintilla H.D. Pflug, 1966 †
- Genus Scolopendra Shaw, 1794
- Genus Scortimus Montfort, 1808
- Genus Seguenza Silvestri, 1889
- Genus Semseya Franzenau, 1894
- Genus Septalingulina Yan & Norling, 1991 †
- Genus Sergentella Brumpt, 1910
- Genus Serginella Pronina, 1963 †
- Genus Serpularia Rostafinski, 1874
- Genus Setigerella Ehrenberg, 1872
- Genus Siagonophorus Stein, 1862
- Genus Siagontherium Perty, 1852
- Genus Sideriporus Bronn, 1848 †
- Genus Siedleckia Janiszewska, 1953
- Genus Sigalasia Delphy, 1938
- Genus Sigmomorphinoides Rouvillois, 1960 †
- Genus Sigmovirgulina Loeblich & Tappan, 1957
- Genus Silicina Bornemann, 1874 †
- Genus Silicoplacentina Köváry, 1956 †
- Genus Silicosigmoilina Israelsky, 1953 †
- Genus Silicotextulina Deflandre, 1934
- Genus Sinuolinea Jameson, 1931
- Genus Siphogenerita Furrer, 1961 †
- Genus Siphonclavalina Silvestri, 1948 †
- Genus Siphosigmoilina Parr, 1942 †
- Genus Skinnerella Coogan, 1960 †
- Genus Soldanina Costa, 1856
- Genus Solenopoda Zarnik, 1907
- Genus Solenopus Zarnik, 1907
- Genus Sparotricha Entz, 1878
- Genus Spastostyla Entz, 1884
- Genus Spathidia Dujardin, 1840
- Genus Spathidiopsis Kahl, 1926
- Genus Spathyocyathus Nie & Lu, 1945
- Genus Spermatias Gistl, 1848
- Genus Spermatobium Reichenbach, 1828
- Genus Spermatogonius Gistl, 1848
- Genus Spermatothalus Leuckart, 1827
- Genus Spermokrates Gistl, 1847
- Genus Sphaeractis Wetzel, 1935 †
- Genus Sphaeractis Brandt, 1935
- Genus Sphaeractis Brandt, 1936 †
- Genus Sphaerella Reitlinger, 1957 †
- Genus Sphaerocalpis Wiśniowski, 1888 †
- Genus Sphaerosporidium Mazzarelli, 1907
- Genus Sphaerosporostes Gistl, 1848
- Genus Sphaerostroma Gürich, 1896
- Genus Sphaira Raymond, 1903
- Genus Spireitlina Vachard & Beckary, 1991 †
- Genus Spiremaria Kozlova, 1960 †
- Genus Spiridobotrys Bütschli, 1881
- Genus Spirilina Bory de St. Vincent, 1826
- Genus Spirillum Diesing, 1848
- Genus Spirocapsa Rüst, 1892 †
- Genus Spirogregarina Wood & Herman, 1943
- Genus Spironympha Oshima, 1917
- Genus Spirophora Zopf in Schenk, 1884
- Genus Spiropleurites Ehrenberg, 1854
- Genus Spirosphaerina Sherborn, 1896
- Genus Spirostegina Zborzewski, 1843
- Genus Spirostomina Gruber, 1884
- Genus Spirulina Bory, 1826
- Genus Spongina Gregorio, 1930 †
- Genus Spongioconcha Mast, 1910
- Genus Spongiodictyum Hensen, 1887
- Genus Spongocyclia Haeckel, 1862
- Genus Spongocyrtis Dunikowski, 1882
- Genus Spongodendron Hollande & Enjumet, 1960
- Genus Spongodictyum Haeckel, 1862
- Genus Spongopylarium Dreyer, 1888
- Genus Spongopylidium Dreyer, 1888
- Genus Spongylomorum Ehrenberg, 1848
- Genus Sporidium Funk, 1901
- Genus Sporobiotes Gistl, 1848
- Genus Sporodonium Gönnert, 1936
- Genus Sporopsyche Gistl, 1848
- Genus Spyridobotrys Haeckel, 1862
- Genus Squalorophyra Goodrich & Jahn, 1943
- Genus Staphylocystis Coutière, 1940
- Genus Stappersia Meunier, 1910
- Genus Staurodiscus Krasheninnikov in Sazonova & Shchutzkoi, 1960 †
- Genus Staurodiscus Neviani, 1900 †
- Genus Staurolithium Haeckel, 1862
- Genus Stegochilium Schewiakoff, 1892
- Genus Stellacantha Popofsky, 1904
- Genus Stellolonche Popofsky, 1904
- Genus Stephanolithes Bury, 1862
- Genus Stephanolithis Ehrenberg, 1847
- Genus Stephanopela de Folin, 1881
- Genus Stephanospyris Haeckel, 1862
- Genus Stephonoma Cohn, 1852
- Genus Sticholepis Ehrenberg, 1872
- Genus Stomatosphaera Dreyer, 1888
- Genus Stravolaema Bory de St. Vincent, 1827
- Genus Stravolaeme Bory de St. Vincent, 1827
- Genus Strephochetus Seely, 1885
- Genus Strephorhetus Vosmaer in Bronn, 1887
- Genus Streptodelus Campbell, 1953 †
- Genus Strombidion Claparède & Lachmann, 1860
- Genus Strombilidium Schewiakoff, 1892
- Genus Strombodes Sjörbring, 1902
- Genus Strombodia Strand, 1917
- Genus Strongyloplasma Lipschuetz, 1912
- Genus Strophoconus Ehrenberg, 1843
- Genus Styla Stechow, 1921
- Genus Stylactis Ehrenberg, 1872
- Genus Stylamoeba Frenzel, 1893
- Genus Styldrya Fromentel, 1874
- Genus Styloceras Pascher, 1922
- Genus Stylodictyon Nicholson & Murie, 1878
- Genus Styloneis Ehrenberg, 1844
- Genus Stylonethes Sterki, 1878
- Genus Styloplotes Stein, 1859
- Genus Stylosphaeridium Pascher, 1925
- Genus Stylospira Haeckel, 1862
- Genus Stylospora Hallier, 1875
- Genus Stylotrochus Haeckel, 1862
- Genus Synspira Ehrenberg, 1854 †
- Genus Talariscus Loeblich & Tappan, 1961 †
- Genus Tansinhokella Banner & Hodgkinson, 1991 †
- Genus Technitella de Folin, ? 1882
- Genus Telosporidium Fuchs, 1915
- Genus Telostoma Grandori, 1935
- Genus Tentaculifera Sokoloff, 1931
- Genus Terebralina Terquem, 1866
- Genus Tereuva Vella, 1961 †
- Genus Terquemina Galloway, 1933
- Genus Testamoeba Epstein, 1926
- Genus Tethysiella Blau in Blau & Haas, 1991 †
- Genus Tetracanthus Popofsky, 1907 †
- Genus Tetracina Loeblich & Tappan, 1961 †
- Genus Tetraplasma Bartenstein & Brand, 1949 †
- Genus Tetrasolenia Ehrenberg, 1860
- Genus Tetrasphaera Popofsky, 1912
- Genus Thalassiosolen Wolfenden, 1902
- Genus Thaumas Ehrenberg, 1832
- Genus Thecotapus Campbell, 1951 †
- Genus Themeone Berthold in Latreille, 1827
- Genus Thetis Viator, 1838
- Genus Thrace Gistl, 1848
- Genus Thuricolopsis Stokes, 1888
- Genus Tignisphaera Popofsky, 1906
- Genus Toddia França, 1911
- Genus Tokayella Altiner, Ozkan & Okan, 1990 †
- Genus Tolypamminella Deleau & Marie, 1959 †
- Genus Topsentella Duboscq & Tuzet, 1936
- Genus Torocapsa Schiller, 1952
- Genus Torquatina Gros, 1850
- Genus Toxinopsis de Folin, 1881
- Genus Toxomus Rafinesque, 1815
- Genus Trachelina Schrank, 1803
- Genus Trachycraterium Rostafinski, 1874
- Genus Trachysporidium Stempell, 1921
- Genus Tragos Goldfuss, 1829
- Genus Tremastegina Brönnimann, 1951 †
- Genus Trematocyclina Munier-Chalmas, 1885
- Genus Trematodiscus Haeckel, 1860
- Genus Triactinosphaera Dunikowski, 1882
- Genus Triadinium Fiorentini, 1890
- Genus Triadiscus Krasheninnikov in Sazonova & Shchutzkoi, 1960 †
- Genus Triaulacias Ehrenberg, 1844
- Genus Tribulina Bory, 1826
- Genus Trichia Hoffmann, 1790
- Genus Trichoderum Strand, 1942 †
- Genus Trichodiscus Ehrenberg, 1830
- Genus Trichodon Fromentel, 1874
- Genus Trichoduboscquia Léger, 1926
- Genus Tricholeptus Fromentel, 1874
- Genus Trichomecium Fromentel, 1874
- Genus Trichomonas Dujardin, 1841
- Genus Trichopelma Levander, 1900
- Genus Trichorhynchus Balbiani, 1887
- Genus Tricomonas Donné in Dujardin, 1836
- Genus Tricosphaera Hinde, 1890
- Genus Tridictyopus Hertwig, 1879
- Genus Triflagellum Namyslowski, 1913
- Genus Trigenerina Schubert, 1902 †
- Genus Trigonodiscus Neviani, 1900 †
- Genus Trigonouva Vella, 1961 †
- Genus Triloba Mudrezowa-Wyss, 1929
- Genus Triloclinella Riccio, 1950 †
- Genus Trinella Bory de St. Vincent, 1827
- Genus Triodonta Bory de St. Vincent, 1827
- Genus Triopsis Rafinesque, 1815
- Genus Trioxeia de Folin, 1888
- Genus Triplagiacantha Schroeder, 1914
- Genus Triposphaera Hinde, 1890
- Genus Tripus Rafinesque, 1815
- Genus Trisphaera Vinassa de Regny, 1917 †
- Genus Trizona Popofsky, 1904
- Genus Trochamina Deecke, 1884 †
- Genus Trochammina Reuss, 1859 †
- Genus Trochamminisca Shchedrina, 1955
- Genus Trochiliascia Deák, 1964 †
- Genus Trochiliscus Ehrenberg, 1858
- Genus Troglotella Wernli & Fookes, 1992 †
- Genus Tropidomonas da Cunha, 1915
- Genus Trypanozoon Lühe, 1906
- Genus Tschoppina Keijzer, 1945 †
- Genus Tubaria Thienemann, 1828 accepted as Stentor Oken, 1815
- Genus Tunetella Brumpt & Lavier, 1935
- Genus Turbienta Bykova, 1961 †
- Genus Turbilina Enriques, 1908
- Genus Turbinella Bory de St. Vincent, 1827
- Genus Turchiniella Grassé & Boissezon, 1929
- Genus Turpinius Ormancey, 1852
- Genus Turriclavula Rhumbler, 1911
- Genus Turrispirrillina Cushman, 1927
- Genus Tuscadora Haeckel, 1879
- Genus Tuvaellina Vologdin, 1958 †
- Genus Twaraina Robinson, 1993 †
- Genus Ty Bory de St. Vincent, 1827
- Genus Typhoides Morgan, 1894
- Genus Uhligina Schubert, 1899
- Genus Ultrazoon Kisch, 1962
- Genus Undella Jörgensen, 1925
- Genus Undellicricos Kofoid & Campbell, 1929
- Genus Unicellula Butlin, 1911
- Genus Urastes Gistl, 1847
- Genus Urbanella Schepotieff, 1912
- Genus Urnuella Szczechura, 1969 †
- Genus Urnulina Gruber, 1884
- Genus Utriculum Modeer, 1792
- Genus Vagenoarium Borgert, 1891
- Genus Valvularia Goldfuss, 1820
- Genus Vampirophrya Chatton & Lwoff, 1931
- Genus Vampyrina Frenzel, 1893
- Genus Vanella Bovee, 1965
- Genus Vautrinellopsis Vachard, 1994 †
- Genus Venilina Gümbel, 1868
- Genus Veroperidinium Paulsen, 1931
- Genus Victoriniella S. Kühn, 1997
- Genus Viereckia Chatton & Lalung-Bonnaire, 1912
- Genus Vitta de Folin, ? 1885
- Genus Vitta de Folin, ? 1882
- Genus Volutaria Zalessky, 1926 †
- Genus Volverella Bory de St. Vincent, 1827
- Genus Volvotextularia Termier & Termier, 1950 †
- Genus Vorticellida Milne-Edwards in Lamarck, 1836
- Genus Vorticellopsis Dons, 1918
- Genus Xanemus Rafinesque, 1814
- Genus Xastrum Neviani, 1900 †
- Genus X-Astrum Neviani, 1900 † accepted as Xastrum Neviani, 1900 †
- Genus Xenotheka Eisenack, 1937 †
- Genus Xyphostaurus Vinassa de Regny, 1898 †
- Genus Xystonella Kofoid & Campbell, 1939
- Genus Xystonelloides Kofoid & Campbell, 1939
- Genus Xystonellopsis Kofoid & Campbell, 1939
- Genus Zekritia Henson, 1948 †
- Genus Zoanemus Rafinesque, 1820
- Genus Zomorphus Rafinesque, 1814
- Genus Zoocladium Ehrenberg, 1831
- Genus Zoomyxa Elmassian, 1909
- Genus Zoospermades Gistl, 1848
- Genus Zooteiria Wright, 1859
- Genus Zoothamnia Bory de St Vincent, 1827
- Genus Zoothamnium Ehrenberg, 1838
- Genus Zygacantha Müller, 1858
- Genus Zygacantha Popofsky, 1904
- Genus Zygapophysia Popofsky, 1904
- Genus Zygolonche Popofsky, 1904
- Genus Zygolonchidium Popofsky, 1904
- Genus Megaclonophycus Xue, Tang, Yu & Zhou, 1995 †
- Genus Megasphaera Chen & Liu, 1986 †
- Genus Parapandorina Xue, Tang, Yu & Zhou, 1995 †
- Genus Syssomonas Tikhonenkov, Hehenberger, Mylnikov & Keeling in Hehenberger et al., 2017
- Genus Tianzhushania L.M. Yin & Z.P. Li, 1978 †
- Genus Tunicaraptor Tikhonenkov et al., 2020
- Genus Yinitianzhushania S. Xiao, C. Zhou, P. Liu, D. Wang & X. Yuan, 2014 †
- Kingdom Viruses
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