DiatomBase
Between brackets is the number of accepted extant species
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- Bacillariophyceae (5 957)
- Subclass Bacillariophyceae incertae sedis (189)
- Subclass Bacillariophycidae (4 408)
- Subclass Coscinodiscophycidae (877)
- Superorder Biddulphianae (230)
- Superorder Chaetocerotanae (95)
- Superorder Corethranae (1)
- Superorder Coscinodiscanae (300)
- Order Arachnoidiscales (4)
- Order Asterolamprales (24)
- Order Aulacoseirales (50)
- Order Chrysanthemodiscales
- Order Coscinodiscales (146)
- Family Aulacodiscaceae (Schütt) Lemmermann, 1903 (12)
- Family Coscinodiscaceae Kützing, 1844 (76)
- Family Gossleriellaceae Round, 1990
- Family Heliopeltaceae H. L. Smith, 1872 (26)
- Family Hemidiscaceae Hendey, 1937 emend Simonsen, 1975 (32)
- Genus Actinocyclus C.G. Ehrenberg, 1837 (14)
- Species Actinocyclus abundans Ehrenberg, 1845
- Species Actinocyclus acanthus Bradbury & Krebs, 1982 †
- Species Actinocyclus acharnar Ehrenberg, 1840
- Species Actinocyclus acharneus Ralfs in Pritchard, 1861
- Species Actinocyclus achates Ehrenberg, 1845
- Species Actinocyclus actinochilus (Ehrenberg) Simonsen, 1982 accepted as Coscinodiscus actinochilus Ehrenberg, 1844
- Species Actinocyclus adamas Ehrenberg, 1845
- Species Actinocyclus adeliae Manguin, 1957
- Species Actinocyclus aeschylus Ehrenberg, 1845
- Species Actinocyclus africanus Leuduger-Fortmorel, 1898
- Species Actinocyclus aldebaran Ehrenberg, 1843
- Species Actinocyclus alexander Ehrenberg, 1845
- Species Actinocyclus alienus Grunow in Cleve, 1883
- Species Actinocyclus allinearius Hanna & Grant, 1926
- Species Actinocyclus americanus M. Peragallo in Tempère & Peragallo, 1908
- Species Actinocyclus amethystus Ehrenberg, 1845
- Species Actinocyclus anacreon Ehrenberg, 1845
- Species Actinocyclus anceps Castracane, 1886
- Species Actinocyclus anceps Leuduger-Fortmorel, 1879
- Species Actinocyclus ancorifer Schumann, 1867
- Species Actinocyclus antarcticus Castracane, 1886
- Species Actinocyclus antarcticus Karsten, 1905
- Species Actinocyclus antares Ehrenberg, 1840
- Species Actinocyclus apelles Ehrenberg, 1845
- Species Actinocyclus apollo Ehrenberg, 1845
- Species Actinocyclus appendiculatus Rattray, 1890
- Species Actinocyclus aquila Ehrenberg, 1840
- Species Actinocyclus arcturus Ehrenberg, 1843
- Species Actinocyclus arcuatus Schumann, 1867
- Species Actinocyclus areolatus (Ehrenberg) Brightwell, 1860 accepted as Omphalopelta areolata Ehrenberg, 1844
- Species Actinocyclus armatus Cleve-Euler, 1941
- Species Actinocyclus asiaticus F.Meister, 1932
- Species Actinocyclus asteriscus (J.A. Barron) Cong Wu, D.M. Williams, Zhiyuan Peng & Chixin Chen, 2022 †
- Species Actinocyclus astroites Ehrenberg, 1845
- Species Actinocyclus astrolites Ralfs in Pritchard, 1861
- Species Actinocyclus atlanticus Müller-Melchers, 1959
- Species Actinocyclus australis Grunow in Van Heurck, 1883
- Species Actinocyclus baicalensis G.K. Khursevich & S.A. Fedenya, 2006
- Species Actinocyclus barkleyi Grunow
- Species Actinocyclus barkleyi Coates, 1861
- Species Actinocyclus beaufortianus (Hustedt) Sullivan, 1983 accepted as Cosmiodiscus beaufortianus Hustedt, 1955 †
- Species Actinocyclus beryllus Ehrenberg, 1845
- Species Actinocyclus betegose Ehrenberg, 1840
- Species Actinocyclus bet-el-gose Ralfs in Pritchard, 1861
- Species Actinocyclus bias Ehrenberg, 1845
- Species Actinocyclus bifrons Karsten, 1905
- Species Actinocyclus bifrons (Castracane) Mann, 1937 accepted as Coscinodiscus bifrons Castracane, 1886
- Species Actinocyclus binonarius Ehrenberg, 1854
- Species Actinocyclus bioctonarius Ehrenberg, 1840
- Species Actinocyclus bipartitus Mann, 1925
- Species Actinocyclus bisenarius Ehrenberg, 1840
- Species Actinocyclus biseptenarius Ehrenberg, 1840
- Species Actinocyclus biternarius Ehrenberg, 1840
- Species Actinocyclus boryanus Pantocsek, 1889
- Species Actinocyclus bradburyii T.Hayash, M.Saito-Kato & Y.Tanimura, 2012 †
- Species Actinocyclus brasiliensis Müller-Melchers, 1957
- Species Actinocyclus bremianus Pantocsek, 1889
- Species Actinocyclus calix Tempère & Brun in Brun & Tempère, 1889
- Species Actinocyclus callimachus Ehrenberg, 1845
- Species Actinocyclus canestrus Hanna & Grant, 1926
- Species Actinocyclus canopus Ehrenberg, 1840
- Species Actinocyclus capella Ehrenberg, 1840
- Species Actinocyclus carbunculus Ehrenberg, 1845
- Species Actinocyclus caspicus (Makarova) Makarova, 1985 accepted as Thalassiosira caspica Makarova, 1959
- Species Actinocyclus cedrus Bradbury & Krebs, 1982 †
- Species Actinocyclus ceres Ehrenberg, 1840
- Species Actinocyclus challengeri O'Meara, 1876
- Species Actinocyclus chilo Ehrenberg, 1845
- Species Actinocyclus cholnokyi VanLandingham, 1967
- Species Actinocyclus chrysolithus Ehrenberg, 1845
- Species Actinocyclus circellus T.P.Watkins, 1986
- Species Actinocyclus circumdatus Pantocsek, 1886
- Species Actinocyclus clavifer Schumann, 1867
- Species Actinocyclus claviolus Bradbury & Krebs, 1982
- Species Actinocyclus cleobulus Ehrenberg, 1845
- Species Actinocyclus clevei Castracane, 1886
- Species Actinocyclus complanatus F.S.Castracane degli Antelminelli
- Species Actinocyclus concentricus Rattray, 1890
- Species Actinocyclus confluens Grunow, 1890
- Species Actinocyclus corona Karsten, 1905
- Species Actinocyclus coscinodiscoides A.Mann, 1937
- Species Actinocyclus crassus (W.Smith) Ralfs ex Pritchard, 1861 accepted as Eupodiscus crassus W.Smith, 1853
- Species Actinocyclus croesus Ehrenberg, 1843
- Species Actinocyclus cruciatus Schumann, 1867
- Species Actinocyclus cubitus Hanna & Grant, 1926
- Species Actinocyclus cupreus Bradbury & Krebs, 1995
- Species Actinocyclus curvatulus Janisch, 1874
- Species Actinocyclus curvatulus (Grunow in A. Schmidt) Cleve, 1901 accepted as Coscinodiscus curvatulus var. curvatulus Grunow in Schmidt et al., 1878
- Species Actinocyclus curvulatus
- Species Actinocyclus cyclotellodies Jousé, 1968
- Species Actinocyclus daedalus Ehrenberg, 1845
- Species Actinocyclus davides Ehrenberg, 1845
- Species Actinocyclus decipiens ‘Castracane' Rattray, 1890
- Species Actinocyclus decussatus Mann, 1925
- Species Actinocyclus decussatus E.Grove
- Species Actinocyclus delicatus E.G. Lupikina & G.K. Khursevich [Chursevich] in G.K. Khursevich & E.G. Lupikina, 1992
- Species Actinocyclus denarius Ehrenberg, 1839
- Species Actinocyclus denticulatus Castracane, 1886
- Species Actinocyclus determinatus G.K. Khursevich & S.A. Fedenya, 2006
- Species Actinocyclus dimorphus (Castracane) Harwood & Maruyama, 1992 accepted as Coscinodiscus dimorphus Castracane, 1886
- Species Actinocyclus disseminatus Pantocsek, 1889
- Species Actinocyclus distinguendus Hustedt, 1956
- Species Actinocyclus dives Ehrenberg, 1840
- Species Actinocyclus divisus (Grunow) Hustedt, 1958 accepted as Coscinodiscus divisus var. divisus Grunow, 1878
- Species Actinocyclus divisus Kisselev, 1931
- Species Actinocyclus dubiosus Karsten, 1906
- Species Actinocyclus dubius Grunow according to H.L. Smith, 1877
- Species Actinocyclus duodenarius (Ehrenberg) W. Smith, 1856
- Species Actinocyclus dux Ehrenberg, 1845
- Species Actinocyclus ehrenbergii Ralfs, 1861
- Variety Actinocyclus ehrenbergii var. asteriscus Barron, 1975 † represented as Actinocyclus asteriscus (J.A. Barron) Cong Wu, D.M. Williams, Zhiyuan Peng & Chixin Chen, 2022 †
- Variety Actinocyclus ehrenbergii var. crassa (W. Smith) Hustedt, 1929 accepted as Eupodiscus crassus W.Smith, 1853
- Variety Actinocyclus ehrenbergii var. depressa Jurilj, 1957
- Variety Actinocyclus ehrenbergii var. genuinus Cleve-Euler, 1951
- Variety Actinocyclus ehrenbergii var. intermedia Grunow in Van Heurck, 1883
- Variety Actinocyclus ehrenbergii var. minutulus Veselkova, 1935
- Variety Actinocyclus ehrenbergii var. minutus Gaponov, 1915
- Variety Actinocyclus ehrenbergii var. partita Tempère & Peragallo, 1910
- Variety Actinocyclus ehrenbergii var. parva Hajós & Palfalvy, 1963
- Variety Actinocyclus ehrenbergii var. quinarius ‘Ehrenberg' Mills, 1933 accepted as Actinocyclus quinarius Ehrenberg, 1839
- Variety Actinocyclus ehrenbergii var. ralfsii (W.Smith) Hustedt, 1929 accepted as Eupodiscus ralfsii var. ralfsii W. Smith, 1856
- Variety Actinocyclus ehrenbergii var. sibirica Skvortzov, 2012
- Variety Actinocyclus ehrenbergii var. sparsa (Gregory) Hustedt, 1929 accepted as Eupodiscus sparsus Gregory, 1857
- Variety Actinocyclus ehrenbergii var. spinosa Jurilj, 1957
- Variety Actinocyclus ehrenbergii var. tamanicus Jousé in Proschkina-Lavrenko, 1949
- Variety Actinocyclus ehrenbergii var. tenella (Brébisson) Hustedt, 1929 accepted as Eupodiscus tenellus Brébisson, 1854
- Forma Actinocyclus ehrenbergii f. bisenarius Tempère & Peragallo, 1908
- Forma Actinocyclus ehrenbergii f. ehrenbergii Ralfs in Pritchard, 1861
- Forma Actinocyclus ehrenbergii f. minutus Pantocsek, 1886
- Forma Actinocyclus ehrenbergii f. quindenarius Tempère & Peragallo, 1908
- Forma Actinocyclus ehrenbergii f. tennellus Baranov, 1942
- Species Actinocyclus ehrenbergii Schumann, 1867
- Species Actinocyclus elegans Karsten, 1905
- Species Actinocyclus elegans Leuduger-Fortmorel, 1879
- Species Actinocyclus ellipticus Grunow
- Species Actinocyclus elongatus Grunow
- Species Actinocyclus eos Kitton, 1880
- Species Actinocyclus euripides Ehrenberg, 1845
- Species Actinocyclus excentricus Peragallo, 1921
- Species Actinocyclus exiguus G.Fryxell & Semina, 1981
- Species Actinocyclus falsus W.Smith
- Species Actinocyclus fasciculatus Harwood & Maruyama, 1992
- Species Actinocyclus ferrarioae Lameiro, Vouilloud & Cefarelli, 2023
- Species Actinocyclus fistulis Olshtynskaja, 1993
- Species Actinocyclus flos Brun in Brun & Tempère, 1889
- Species Actinocyclus fomahot Ehrenberg, 1840
- Species Actinocyclus fomelhot Ehrenberg, 1843
- Species Actinocyclus fortunatus Ehrenberg, 1845
- Species Actinocyclus fryxelliae Barron in Baldauf & Barron, 1991
- Species Actinocyclus fulvus (W.Smith) Ralfs ex Pritchard, 1861 accepted as Eupodiscus fulvus W. Smith, 1853
- Species Actinocyclus fungiformis Temniskova-Topalova, Khursevich & Valeva, 1993
- Species Actinocyclus fuscus (Norman) H.L. Smith, 1876 accepted as Coscinodiscus fuscus G.Norman, 1861
- Species Actinocyclus gallicus Meister, 1937
- Species Actinocyclus giennensis Azpeitia y Moros, 1911
- Species Actinocyclus gorbunovii (Sheshukova) Moiseeva & Sheshukova in Khursevich, Moiseeva, Kozyrenko & Rubina, 1990 accepted as Coscinodiscus gorbunovii var. gorbunovii Scheschukova-Poretzkaya in Scheschukova-Poretzkaya & Mossejeva, 1964
- Species Actinocyclus graecorum Ehrenberg, 1854
- Species Actinocyclus guinensis Grove in Rattray, 1890
- Species Actinocyclus hajosiae Barron, 1983
- Species Actinocyclus helveticus “Grunow” Rattray, 1890
- Species Actinocyclus helveticus Brun, 1895
- Species Actinocyclus hesiodus Ehrenberg, 1845
- Species Actinocyclus heteractis Ehrenberg, 1873
- Species Actinocyclus hexapterus Ehrenberg, 1841
- Species Actinocyclus hispanicus Azpeitia y Moros, 1911
- Species Actinocyclus homerus Ehrenberg, 1845
- Species Actinocyclus horatius Ehrenberg, 1845
- Species Actinocyclus hustedtii Meister, 1932
- Species Actinocyclus hyacinthus Ehrenberg, 1845
- Species Actinocyclus immemoratus G.K. Khursevich & S.A. Fedenya, 2006
- Species Actinocyclus imperator Ehrenberg, 1845
- Species Actinocyclus incertus Grunow in Van Heurck, 1883
- Species Actinocyclus ingens Rattray, 1890 †
- Species Actinocyclus intermedius ‘Grunow' Rattray
- Species Actinocyclus intermittens Karsten, 1905
- Species Actinocyclus interpunctatus (Brightwell) Ralfs in Pritchard, 1861 accepted as Actinoptychus interpunctatus Brightwell, 1860
- Species Actinocyclus interpunctatus sensu H.L. Smith, 1874
- Species Actinocyclus irregularis Van Heurck, 1909
- Species Actinocyclus janischii Schumann, 1867
- Species Actinocyclus janus Karsten, 1905
- Species Actinocyclus janus (Castracane) M. Peragallo, 1897 accepted as Coscinodiscus janus Castracane, 1886
- Species Actinocyclus japonicus Castracane, 1886
- Species Actinocyclus jaspis Ehrenberg, 1845
- Species Actinocyclus jasponyx Ehrenberg, 1845
- Species Actinocyclus jouseae J.A. Barron, 2005
- Species Actinocyclus juno Ehrenberg, 1840
- Species Actinocyclus jupiter Ehrenberg, 1840
- Species Actinocyclus kanitzii (Pantocsek & Grunow) Schauderna, 1983 accepted as Stephanodiscus kanitzii f. kanitzii Pantocsek & Grunow in Pantocsek, 1886
- Species Actinocyclus karstenii Van Heurck, 1909
- Species Actinocyclus kisselevii Makarova, 1961
- Species Actinocyclus knemeides Pantocsek, 1886
- Species Actinocyclus kozyrenkoae Olshtynskaja, 1993
- Species Actinocyclus krasskei Bradbury & Krebs, 1995
- Species Actinocyclus kuetzingii (A. Schmidt) Simonsen, 1975 accepted as Coscinodiscus kuetzingii var. kuetzingii Schmidt in Schmidt et al., 1878
- Species Actinocyclus kützingii (A.Schmidt) Simonsen
- Species Actinocyclus labyrinthicus Pantocsek, 1886
- Species Actinocyclus leucochrysus Ehrenberg, 1845
- Species Actinocyclus levis Jousé, 1973
- Species Actinocyclus ligularis G.K. Khursevich & E.G. Lupikina, 1992
- Species Actinocyclus limbatus Meister, 1937
- Species Actinocyclus lobatus (N.V.Rubina) N.V.Rubina & Khursevich, 1991 accepted as Coscinodiscus lobatus Rubina, 1967
- Species Actinocyclus locuples Ehrenberg, 1845
- Species Actinocyclus lóczyi Pantocsek, 1892
- Species Actinocyclus luna Ehrenberg, 1840
- Species Actinocyclus luxuriosus Ehrenberg, 1845
- Species Actinocyclus lyra Ehrenberg, 1840
- Species Actinocyclus maccollumii Harwood & Maruyama, 1992 accepted as Stellarima maccollumii (Harwood & T. Maruyama) Gogorev, 2018
- Species Actinocyclus magnificus Ehrenberg, 1845
- Species Actinocyclus makarovae (Temniskova & Ognyanova-Rumenova) Temniskova-Topalova & Ognyanova-Rumenova, 1992 accepted as Pontodiscus makarovae Temniskova-Topalova & Ognyanova-Rumenova, 1990 †
- Species Actinocyclus mangishlakensis Jousé, 1978
- Species Actinocyclus mannii Pantocsek, 1910
- Species Actinocyclus mars Ehrenberg, 1840
- Species Actinocyclus marylandicus Rattray, 1890
- Species Actinocyclus mejillonis Rattray, 1890
- Species Actinocyclus mercurius Ehrenberg, 1840
- Species Actinocyclus minutus Greville in litt., Rattray, 1890
- Species Actinocyclus miocenicus Jousé, 1973
- Species Actinocyclus mirabilis Rattray, 1890
- Species Actinocyclus moniliformis Ralfs ex Pritchard, 1861 accepted as Actinocyclus octonarius var. tenella (de Brébisson) Hendey
- Species Actinocyclus moronensis Deby in litt., Rattray, 1890
- Species Actinocyclus moroniensis Brun, 1891
- Species Actinocyclus motilis Bradbury & Krebs, 1995
- Species Actinocyclus murrayensis Grove in litt. in Rattray, 1890
- Species Actinocyclus muticus Khursevich & Rehakova, 1994 †
- Species Actinocyclus nebulosus Bradbury & Krebs, 1995
- Species Actinocyclus neogenicus Reinhold, 1937
- Species Actinocyclus neogradensis Pantocsek, 1892
- Species Actinocyclus niagarae H.L. Smith, 1878
- Species Actinocyclus nigriniae J.A. Barron, 2005
- Species Actinocyclus ninus Ehrenberg, 1845
- Species Actinocyclus nipponicus T.Hayash, M.Saito-Kato & Y.Tanimura, 2012 †
- Species Actinocyclus nonarius Ehrenberg, 1840
- Species Actinocyclus nordlingensis Schauderna, 1983
- Species Actinocyclus normanii (Gregory) Hustedt, 1957
- Species Actinocyclus novemdenarius Ehrenberg, 1844
- Species Actinocyclus numa Ehrenberg, 1845
- Species Actinocyclus obscurus Rattray, 1890
- Species Actinocyclus oceanicus Rattray, 1890
- Species Actinocyclus ochotensis A.P.Jousé, 1969
- Species Actinocyclus octodenarius Ehrenberg, 1839
- Species Actinocyclus octonarius Ehrenberg, 1837 accepted as Actinoptychus octonarius (Ehrenberg) Kützing, 1844
- Species Actinocyclus oculatus Jousé, 1968
- Species Actinocyclus oliveranus O'Meara, 1876
- Species Actinocyclus omphax Ehrenberg, 1845
- Species Actinocyclus omphus Ralfs in Pritchard, 1861
- Species Actinocyclus onyx Ehrenberg, 1845
- Species Actinocyclus opalus Ehrenberg, 1845
- Species Actinocyclus opiparus Ehrenberg, 1845
- Species Actinocyclus opulentus Ehrenberg, 1844
- Species Actinocyclus ornatus Rattray, 1890
- Species Actinocyclus orpheus Ehrenberg, 1845
- Species Actinocyclus ovalis Grunow accepted as Eupodiscus ovalis G.Norman, 1861
- Species Actinocyclus ovalis ‘Wood' VanLandingham, 1979
- Species Actinocyclus ovatus E.J.F. Wood, 1963
- Species Actinocyclus pallas Ehrenberg, 1840
- Species Actinocyclus panhelios Ehrenberg, 1840
- Species Actinocyclus pantocsekii
- Species Actinocyclus paradoxus Ehrenberg, 1854
- Species Actinocyclus paradoxus Makarova, 1959
- Species Actinocyclus partitus (Grunow in Van Heurck) Rattray, 1890 accepted as Actinocyclus partitus Grunow in Van Heurck, 1883
- Species Actinocyclus partitus Grunow in Van Heurck, 1883
- Species Actinocyclus parvus Hasle, 1960
- Species Actinocyclus pellucidus Castracane, 1886
- Species Actinocyclus peplum Brun, 1891
- Species Actinocyclus periander Ehrenberg, 1845
- Species Actinocyclus phidias Ehrenberg, 1845
- Species Actinocyclus pindarus Ehrenberg, 1845
- Species Actinocyclus pinnulus Bradbury & Krebs, 1982 †
- Species Actinocyclus pittacus Ehrenberg, 1845
- Species Actinocyclus platensis Müller-Melchers, 1953
- Species Actinocyclus plutus Ehrenberg, 1845
- Species Actinocyclus podolicus (Missuna) Kozyrenko, 1959
- Species Actinocyclus polyactis Ehrenberg, 1845
- Species Actinocyclus polygonus (F.S.Castracane degli Antelminelli) H.F.Van Heurck
- Species Actinocyclus polyradiatus ‘Castracane' Tempère & Peragallo, 1912
- Species Actinocyclus polysculptus Mann, 1937
- Species Actinocyclus portaregiensis A. Berg, 1952
- Species Actinocyclus praxiteles Ehrenberg, 1845
- Species Actinocyclus pretiosus Ehrenberg, 1845
- Species Actinocyclus procyon Ehrenberg, 1840
- Species Actinocyclus prodigus Ehrenberg, 1845
- Species Actinocyclus propinquus Jousé, 1973
- Species Actinocyclus proserpina Ehrenberg, 1845
- Species Actinocyclus pruinosus Castracane, 1886
- Species Actinocyclus pseudopodolicus Kovaleva & Gogorev, 2018 †
- Species Actinocyclus ptolemaeus Ehrenberg, 1845
- Species Actinocyclus pumilus Castracane, 1886
- Species Actinocyclus punctulatus Castracane, 1886
- Species Actinocyclus pusillus (E.Grove) E.Grove accepted as Coscinodiscus pusillus Grove ms. in Rattray, 1890
- Species Actinocyclus pyrgoteles Ehrenberg, 1845
- Species Actinocyclus pyrotechnicus Deby ms. in Rattray, 1890
- Species Actinocyclus pyxidicula Ehrenberg, 1854
- Species Actinocyclus quaternarius Ehrenberg, 1839
- Species Actinocyclus quatuordenarius Ehrenberg, 1854
- Species Actinocyclus quinarius Ehrenberg, 1839
- Species Actinocyclus quindenarius Ehrenberg, 1840
- Species Actinocyclus radians J.Rattray
- Species Actinocyclus radiatus Rattray, 1890
- Species Actinocyclus radionovae J.A. Barron (1983) †
- Species Actinocyclus ralfsii (W.Smith) Ralfs, 1861 accepted as Actinocyclus octonarius var. ralfsii (W.Smith) Hendey, 1954
- Species Actinocyclus regulus Ehrenberg, 1840
- Species Actinocyclus rex Ehrenberg, 1845
- Species Actinocyclus rex Bale, 1913
- Species Actinocyclus rigl Ehrenberg, 1840
- Species Actinocyclus robustus Andrews in Abbott & Andrews, 1979
- Species Actinocyclus roperi (Brébisson) Grunow ex Van Heurck, 1881 accepted as Eupodiscus roperi Brébisson, 1870
- Species Actinocyclus rosoleo Hanna & Grant, 1926
- Species Actinocyclus rotula J.-J.Brun
- Species Actinocyclus sagittulus Villareal, 1983
- Species Actinocyclus salomon Ehrenberg, 1845
- Species Actinocyclus samoensis (Grunow in Van Heurck) De Toni & Forti, 1923 accepted as Actinocyclus ralfsii var. samoensis Grunow in Van Heurck, 1883
- Species Actinocyclus saphirus Ehrenberg, 1845
- Species Actinocyclus sappho Ehrenberg, 1845
- Species Actinocyclus sarda Ehrenberg, 1845
- Species Actinocyclus sardonyx Ehrenberg, 1845
- Species Actinocyclus saturnus Ehrenberg, 1840
- Species Actinocyclus sedenarius Ehrenberg, 1839
- Species Actinocyclus sedenarius Roper, 1854
- Species Actinocyclus semiocellatus Schumann, 1867
- Species Actinocyclus senarius Ehrenberg, 1838
- Species Actinocyclus senarius Harting, 1852
- Species Actinocyclus sendaianus Brun, 1891
- Species Actinocyclus septemdenarius Ehrenberg, 1844
- Species Actinocyclus septenarius Ehrenberg, 1839
- Species Actinocyclus setanensis H.Tanaka †
- Species Actinocyclus signatus Rattray, 1890
- Species Actinocyclus similis Karsten, 1905
- Species Actinocyclus sirius Ehrenberg, 1840
- Species Actinocyclus smaragdus Ehrenberg, 1845
- Species Actinocyclus socrates Ehrenberg, 1845
- Species Actinocyclus sol Ehrenberg, 1840
- Species Actinocyclus solon Ehrenberg, 1845
- Species Actinocyclus sophocles Ehrenberg, 1845
- Species Actinocyclus sparsus (Gregory) Rattray, 1890 accepted as Eupodiscus sparsus Gregory, 1857
- Species Actinocyclus spica Ehrenberg, 1840
- Species Actinocyclus spinosus Brightwell, 1860
- Species Actinocyclus spiralis M. Peragallo in Tempère & Peragallo, 1908
- Species Actinocyclus spiritus T.P.Watkins, 1986
- Species Actinocyclus splendens Rattray, 1890
- Species Actinocyclus srinivasanii Desikachary & Devi, 1986
- Species Actinocyclus stella-polaris Ehrenberg
- Species Actinocyclus stellatus Forti in Tempère & Peragallo, 1914
- Species Actinocyclus stictodiscus Grunow in Van Heurck, 1883
- Species Actinocyclus styliferum G.K. Khursevich & S.A. Fedenya, 2006
- Species Actinocyclus subcrassus Rattray, 1890
- Species Actinocyclus subdivisus ‘(Truan y Luard & Witt) Schmidt' according to Rattray accepted as Coscinodiscus subdivisus Truan y Luard & Witt, 1888
- Species Actinocyclus subocellatus (Grunow) Rattray, 1890 accepted as Coscinodiscus curvatulus var. subocellata Grunow, 1884
- Species Actinocyclus subtilis (W.Gregory) Ralfs, 1861
- Species Actinocyclus tenellus (Brébisson) Grunow, 1867 accepted as Eupodiscus tenellus Brébisson, 1854
- Species Actinocyclus tenuissimus Cleve, 1878
- Species Actinocyclus ternarius Ehrenberg, 1839
- Species Actinocyclus terra Ehrenberg, 1840
- Species Actinocyclus tessellatus (Roper) Ralfs ex Pritchard, 1861 accepted as Eupodiscus tesselatus Roper, 1858
- Species Actinocyclus thales Ehrenberg, 1845
- Species Actinocyclus theleus Bradbury & Krebs, 1995
- Species Actinocyclus thomei Leuduger-Fortmorel, 1898
- Species Actinocyclus thumii (Cleve) Pantocsek
- Species Actinocyclus topazius Ehrenberg, 1845
- Species Actinocyclus tortuosus Mann, 1937
- Species Actinocyclus trapeziformis (Rubina) Rubina & Khursevich, 1990 † accepted as Coscinodiscus trapeziformis N.V.Rubina, 1967 †
- Species Actinocyclus tredenarius Ehrenberg, 1840
- Species Actinocyclus trilingulatus Brightwell, 1860
- Species Actinocyclus triradiatus Roper, 1858
- Species Actinocyclus tropicus Hustedt, 1956
- Species Actinocyclus tsugaruensis Kanaya, 1959
- Species Actinocyclus tubalcain Ehrenberg, 1845
- Species Actinocyclus tubulosus Khursevich in Khursevich, Moiseeva, Kozyrenko & Rubina, 1990
- Species Actinocyclus tunkaensis Khursevich, 1994
- Species Actinocyclus tyrtaeus Ehrenberg, 1845
- Species Actinocyclus umbonatus Castracane, 1886
- Species Actinocyclus undatus Harting, 1852
- Species Actinocyclus undatus (Cleve) Rattray, 1890 accepted as Actinocyclus undatus Cleve, 1885
- Species Actinocyclus undatus Cleve, 1885
- Species Actinocyclus undenarius Ehrenberg, 1840
- Species Actinocyclus undulatus J.W.Bailey, 1842
- Species Actinocyclus undulatus Kützing, 1844
- Species Actinocyclus uranus Ehrenberg, 1840
- Species Actinocyclus valdiviae Karsten, 1905
- Species Actinocyclus variabilis (Makarova) Makarova, 1985 accepted as Thalassiosira variabilis var. variabilis Makarova, 1959
- Species Actinocyclus variabilis Corda, 1840
- Species Actinocyclus varians Mann in Karsten, 1928
- Species Actinocyclus venenosus Bradbury & Krebs, 1995
- Species Actinocyclus venus Ehrenberg, 1840
- Species Actinocyclus verrucosus Hemprich & Ehrenberg, 1831
- Species Actinocyclus vesta Ehrenberg, 1840
- Species Actinocyclus vestigulus T.P.Watkins, 1986
- Species Actinocyclus vetustissimus Rattray ms. Rattray, 1890
- Species Actinocyclus vicenarius Ehrenberg, 1840
- Species Actinocyclus virgilius Ehrenberg, 1845
- Species Actinocyclus vitimicus Usoltseva & Khursevich †
- Species Actinocyclus vitreus M. Peragallo in Peragallo & Peragallo, 1908
- Species Actinocyclus yarrensis according to VanLandingham
- Species Actinocyclus zeuxis Ehrenberg, 1845
- Species Actinocyclus zoraster Ehrenberg, 1845
- Genus Araniscus S. Komura, 1998 †
- Genus Azpeitia M. Peragallo in J. Tempère & H. Peragallo, 1912 (2)
- Genus Charcotiella S. Blanco & C.E. Wetzel, 2016 (14)
- Genus Fideliacyclus P.A.Siver, A.P.Wolfe & M.B.Edlund, 2016 †
- Genus Hemidiscus G.C. Wallich, 1860 (1)
- Genus Pseudoguinardia H.A. von Stosch, 1985
- Genus Roperia A. Grunow ex J. Pelletan, 1889 (1)
- Family Hemipeltaceae
- Family Rocellaceae
- Family Stellarimaceae V.A.Nikolaev ex P.A.Sims & G.R.Hasle, 1990
- Order Ethmodiscales
- Order Melosirales (54)
- Order Orthoseirales (18)
- Order Paraliales (4)
- Order Stictocycales
- Order Stictodiscales
- Superorder Cymatosirophycanae (10)
- Superorder Lithodesmiophycanae (7)
- Superorder Rhizosolenianae (37)
- Superorder Thalassiosiranae (192)
- Order Arcanodiscales (5)
- Order Stictocyclales
- Subclass Fragilariophycidae (483)
- Order Centrales
