| Species | as Species | Doubtful |
|---|
Connected successfully| Acanthoica quattrospina Lohman, 1903 | | |
| Achnanthes brevipes C.A. Agardh, 1824 | | |
| Achnanthes brevipes var. intermedia (Kützing) P.T. Cleve, 1895 | | |
| Achnanthes longipes Agardh, 1824 | | |
| Achnanthes parvula Kützing, 1844 | ''Achnanthes brevipes var. parvula''; | |
| Achnanthidium minutissimum (Kützing) Czarnecki, 1994 | ''Achnanthes minutissima''; | |
| Actinastrum hantzschii Lagerheim, 1882 | | |
| Actinocyclus octonarius Ehrenberg, 1838 | ''Actinocyclus ehrenbergii''; | |
| Actinocyclus octonarius var. crassus (W. Smith) Hendey, 1954 | ''Actinocyclus ehrenbergii var. crassus''; | |
| Actinocyclus octonarius var. ralfsii (W. Smith) Hendey, 1954 | ''Actinocyclus ehrenbergii var. ralfsii''; | |
| Actinocyclus octonarius var. tenellus (Brébisson) Hendey, 1954 | ''Actinocyclus tenellus''; | |
| Actinoptychus senarius (Ehrenberg) Ehrenberg, 1843 | ''Actinoptychus undulatus''; | |
| Akashiwo sanguinea (K.Hirasaka) G.Hansen & Ø.Moestrup | ''Gymnodinium splendens''; | |
| Alexandrium ostenfeldii (Paulsen) Balech & Tangen, 1985 | ''Goniodoma ostenfeldii''; | |
| Amphidinium aculeatum Schröder | | |
| Amphidinium crassum Lohmann, 1908 | also ''Amphidinium phaeocysticola''; | |
| Amphidinium cucurbita Kofoid & Swezy, 1921 | | |
| Amphidinium curvatum Schiller, 1928 | | |
| Amphidinium extensum Wulff, 1916 | | |
| Amphidinium flagellans Schiller, 1928 | | |
| Amphidinium globosum Schröder, 1911 | | |
| Amphidinium longum Lohmann, 1908 | | |
| Amphidinium operculatum Claparède & Lachmann, 1859 | | |
| Amphidinium ovum Herdman, 1924 | | |
| Amphora angusta Gregory, 1857 | | |
| Amphora costata W. Smith, 1853 | | |
| Amphora hyalina Kützing, 1844 | | |
| Amphora insecta Grunow ex A. Schmidt, 1876 | | |
| Amphora marina W. Smith 1857 | | |
| Amphora ostrearia Brébisson, 1849 | | |
| Amphora ovalis (Kützing) Kützing, 1844 | | |
| Amphora scopulorum M.H.Giffen | | |
| Amylax triacantha (Jörgensen, 1899) Sournia, 1984 | ''Gonyaulax triacantha''; | |
| Anabaena kisseleviana | | |
| Anabaena knipowitscii Ussachev | | |
| Anabaena scheremetievi Elenkin 1909 | | |
| Anabaena spiroides Klebahn, 1895 | | |
| Anabaena spiroides f. contorta | | |
| Anabaenopsis arnoldii Apetk | | |
| Anacanthoica acanthos (Schiller) Deflandre, 1952 | ''Acanthoica acanthos''; | |
| Ankistrodesmus acicularis var. mirabilis (W.West & G.S.West) Korshikov | | |
| Ankistrodesmus falcatus (Corda) Ralfs, 1848 | | |
| Ankistrodesmus fusiformis Corda ex Korshikov | | |
| Ankistrodesmus longissimus var. acicularis | | |
| Aphanizomenon flos-aquae (Linnaeus) Ralfs ex Bornet & Flahault, 1888 | also ''Anabaena flos-aquae''; | |
| Aphanocapsa incerta (Lemmermann) Cronberg & Komárek 1994 | ''Microcystis pulverea f. incerta''; | |
| Archaeperidinium minutum (Kofoid) Jorgensen, 1912 | ''Peridinium minutum''; | |
| Ardissonea crystallina (C.A. Agardh) Grunow in Cleve & Grunow, 1880 | ''Synedra crystallina''; | |
| Ardissonea fulgens (Greville) Grunow in Cleve & Grunow, 1880 | ''Synedra fulgens''; | |
| Ardissonea robusta (Ralfs ex Pritchard) De Notaris | ''Synedra robusta''; | |
| Asterionella formosa Hassall, 1850 | | |
| Asterionella gracillima (Hantzsch) Heiberg, 1863 | | |
| Asteromphalus flabellatus (Brébisson) Greville, 1859 | | |
| Asteromphalus heptactis (Brébisson) Ralfs, 1861 | | |
| Asteromphalus robustus Castracane, 1875 | | |
| Aulacoseira distans (Ehrenberg) Simonsen, 1979 | ''Melosira distans''; | |
| Aulacoseira granulata (Ehrenberg) Simonsen, 1979 | ''Melosira granulata''; | |
| Aulacoseira granulata var. angustissima (O. Müller) Simonsen, 1979 | ''Melosira granulata var. angustissima''; | |
| Aulacoseira italica (Ehrenberg) Simonsen 1979 | ''Melosira italica''; | |
| Aulacoseira italica var. tenuissima Grun. In Van Heurck, 1882 | ''Melosira italica var. tenuissima''; | |
| Aurosphaera echinata | | |
| Bacillaria paxillifera (O.F.Müller) T.Marsson, 1901 | ''Bacillaria paradoxa'' J.F. Gmelin in Linnaeus, 1788; | |
| Bacteriastrum delicatulum Cleve, 1897 | | |
| Bacteriastrum hyalinum Lauder, 1864 | | |
| Bellerochea horologicalis von Stosch, 1980 | ''Bellerochea malleus''; | Doubtful |
| Berkeleya rutilans (Trentepohl ex Roth) Grunow, 1880 | ''Amphipleura rutilans''; | |
| Biddulphia rhombus (Ehrenberg) W. Smith, 1856 | | |
| Caloneis amphisbaena (Bory) P.T. Cleve, 1894 | | |
| Caloneis liber (W. Sm.) Cleve, 1894 | | |
| Caloneis linearis (Grun.) Boyer, 1927 | ''Caloneis liber var. linearis''; | |
| Calyptrosphaera incisa Schill. | | |
| Calyptrosphaera oblonga Lohman, 1902 | | |
| Campylodiscus echeneis Ehrenberg ex Kützing, 1844 | | |
| Campylodiscus fastuosus Ehrenberg, 1845 | ''Campylodiscus parvulus'' and ''Campylodiscus thuretii''; | |
| Campylodiscus thuretii var. lineolatum Pr.-Lavr., 1955 | | |
| Carteria acuta | | |
| Carteria crassifilis | | |
| Carteria cylindraceae | | |
| Cerataulina pelagica (Cleve) Hendey, 1937 | ''Cerataulina bergonii''; | |
| Cerataulus turgidus (Ehrenberg) Ehrenberg 1843 | | |
| Ceratium hirundinella (O.F. Müller) Dujardin, 1841 | | |
| Ceratoneis arcus var. amphyoxis | | |
| Chaetoceros affinis Lauder, 1864 | | |
| Chaetoceros affinis f. schutii | | |
| Chaetoceros anastomosans Grunow | | |
| Chaetoceros borealis J.W. Bailey, 1854 | | |
| Chaetoceros borealis f. solitaria Cleve | | |
| Chaetoceros borgei Lemmermann, 1904 | | |
| Chaetoceros calcitrans (Paulsen) Takano, 1968 | ''Chaetoceros simplex var. calcitrans''; | |
| Chaetoceros compressus Lauder, 1864 | | |
| Chaetoceros constrictus Gran, 1897 | | |
| Chaetoceros constrictus var. ambiguus A.I. Proshkina-Lavrenko | | |
| Chaetoceros convolutus Castracane, 1886 | | |
| Chaetoceros coronatus Gran, 1897 | | |
| Chaetoceros curvisetus P.T. Cleve, 1889 | | |
| Chaetoceros danicus P.T.Cleve, 1889 | | |
| Chaetoceros debilis P.T. Cleve, 1894 | | |
| Chaetoceros decipiens P.T. Cleve, 1873 | | |
| Chaetoceros densus P.T. Cleve, 1901 | | |
| Chaetoceros diadema (Ehrenberg) Gran, 1897 | ''Chaetoceros subsecundus''; | |
| Chaetoceros diversus Cleve, 1873 | | |
| Chaetoceros dubius Pr.-Lavrenko | | |
| Chaetoceros fallax Prosckina-Lavrenko, 1955 | | |
| Chaetoceros heterovalvatus Prosckina-Lavrenko | | |
| Chaetoceros holsaticus Schütt, 1895 | | |
| Chaetoceros insignis Prosckina-Lavrenko | | |
| Chaetoceros karianus Grunow, 1880 | | |
| Chaetoceros knipowitschii A. Henckel | | |
| Chaetoceros laciniosus Schütt, 1895 | | |
| Chaetoceros lauderi Ralfs in Lauder, 1864 | | |
| Chaetoceros lorenzianus Grunow, 1863 | | |
| Chaetoceros lorenzianus f. subsalinus Proshkina-Lavrenko | | |
| Chaetoceros lorenzianus var. solitarius Proshkina-Lavrenko | | |
| Chaetoceros mitra (J.W. Bailey) P.T. Cleve, 1896 | | |
| Chaetoceros muelleri Lemmermann, 1898 | | |
| Chaetoceros neogracilis VanLand., 1968 | ''Chaetoceros gracilis''; | |
| Chaetoceros odessanus Axentjev | | |
| Chaetoceros paulsenii Ostenfeld, 1901 | | |
| Chaetoceros pelagicus P.T. Cleve, 1873 | | Doubtful |
| Chaetoceros peruvianus Brightw. | | |
| Chaetoceros pseudocrinitus Ostenfeld, 1901 | | |
| Chaetoceros rigidus Ostenfeld | | |
| Chaetoceros scabrosus Prosckina-Lavrenko | | |
| Chaetoceros seiracanthus Gran, 1897 | | |
| Chaetoceros similis P.T. Cleve, 1896 | | |
| Chaetoceros similis f. solitarius Proschkina-Lavrenko | | |
| Chaetoceros simplex Ostenfeld, 1901 | | |
| Chaetoceros socialis f. autumnalis A.I. Proshkina-Lavrenko | | |
| Chaetoceros socialis f. vernalis A.I. Proshkina-Lavrenko | | |
| Chaetoceros subtilis (Proschkina-Lavrenko) Proschkina-Lavrenko, 1961 | | |
| Chaetoceros subtilis var. abnormis | | |
| Chaetoceros subtilis var. abnormis f. simplex | | |
| Chaetoceros teres P.T. Cleve, 1896 | | |
| Chaetoceros tetrachaeta Ehrenberg | | |
| Chaetoceros wighamii Brightwell, 1856 | | |
| Chaetoceros willei Grunow, 1897 | ''Chaetoceros affinis var. willei''; | |
| Chlamydoblepharis knollii Schiller | | |
| Chlamydomonas perpusilla Gerloff | ''Chlamydomonas minima''; | |
| Chlamydomonas pulvisculus Ehrenberg | | |
| Chlamydomonas pyriformis J. Schiller | | |
| Chlamydonephris cor (J.Schiller) H.Ettl & O.Ettl | ''Chlamydomonas cor''; | |
| Chlorella vulgaris Beijerinck 1890 | | |
| Chlorolobion braunii (Nägeli) Komàrek 1979 | ''Ankistrodesmus braunii''; | |
| Chloromonas cuneata | | |
| Chloromonas sphaera | | |
| Chloromonas tener Schiller | | |
| Chlorotetraedron incus (Teiling) Komárek & Kovácik, 1985 | ''Tetraedron incus''; | |
| Cladopyxis brachiolata Stein, 1883 | | |
| Climaconeis inflexa (Brébisson ex Kützing) E.J.Cox, 1982 | ''Amphora inflexa''; | |
| Closterium exiguum West & G.S.West, 1902 | | |
| Cocconeis pediculus Ehrenberg, 1838 | | |
| Cocconeis placentula Ehrenberg, 1838 | | |
| Cocconeis scutellum (Grunow in Van Heurck) P.T. Cleve, 1896 | | |
| Cocconeis scutellum var. minutissima Grunow in Van Heurck, 1880 | | |
| Cocconeis scutellum var. parva (Grunow in Van Heurck) P.T. Cleve, 1896 | | |
| Cochlodinium adriaticum Schiller, 1933 | ''Gyrodinium adriaticum''; | |
| Cochlodinium archimedes (Pouchet, 1883) Lemmermann, 1899 | | |
| Cochlodinium lebourae Kofoid & Swezy, 1921 | | |
| Cochlodinium pirum (Schütt, 1895) Lemmermann, 1899 | | |
| Coelastrum microporum Nägeli in A. Braun, 1855 | | |
| Coelastrum sphaericum Nägeli, 1849 | | |
| Coelosphaerium kuetzingianum Nägeli, 1849 | | |
| Coronosphaera mediterranea (Lohmann, 1902) Gaarder, 1977 | ''Syracosphaera mediterranea''; | |
| Coscinodiscus apiculatus Ehrenberg, 1844 | | |
| Coscinodiscus asteromphalus Ehrenberg, 1844 | | |
| Coscinodiscus asteromphalus var. centralis Grunow 1884: 79 | | |
| Coscinodiscus asteromphalus var. subbulliensis | | |
| Coscinodiscus commutatus Grunow, 1884 | ''Coscinodiscus jonesianus var. commutatus''; | |
| Coscinodiscus concinnus W. Smith, 1856 | | |
| Coscinodiscus gigas Ehrenb. 1841 | | |
| Coscinodiscus granii Gough, 1905 | | |
| Coscinodiscus granii var. aralensis (Ostenfeld 1908) Hustedt | | |
| Coscinodiscus janischii Schmidt, 1878 | | |
| Coscinodiscus jonesianus (Greville) Ostenfeld, 1915 | | |
| Coscinodiscus lacustris Grunow in Cleve & Grunow, 1880 | | |
| Coscinodiscus marginatus Ehrenberg, 1841 (1843, 1844) | | |
| Coscinodiscus monodon K.S. Mereschkowsky | | |
| Coscinodiscus nitidus W. Gregory, 1857 | | |
| Coscinodiscus nitidus var. subradiata K.S. Mereschkowsky | | |
| Coscinodiscus oculus-iridis (Ehrenberg) Ehrenberg, 1854 | | |
| Coscinodiscus perforatus (Forti) Hust., 1928 | | |
| Coscinodiscus perforatus var. cellulosus Grun., 1844 | | |
| Coscinodiscus perforatus var. pavillardii (Forti) Hust., 1928 | | |
| Coscinodiscus radiatus Ehrenberg, 1841 | | |
| Crucigenia irregularis Wille, 1898 | | |
| Crucigenia tetrapedia (Kirchner) W. & G.S. West, 1902 | | |
| Crucigeniella apiculata (Lemmermann) Komárek, 1974 | ''Crucigenia apiculata''; | |
| Crucigeniella rectangularis (Nägeli) Komárek, 1974 | ''Crucigenia rectangularis''; | |
| Ctenophora pulchella (Ralfs ex Kützing) Williams & Round, 1986 | ''Synedra pulchella''; | |
| Cyclotella caspia Grunow, 1878 | | |
| Cyclotella kuetzingiana Thwaites, 1848 | | |
| Cyclotella meneghiniana Kützing, 1844 | | |
| Cylindrotheca closterium (Ehrenberg) Reiman & Lewin, 1964 | | |
| Cymatopleura elliptica (Brébisson ex Kützing) W. Smith, 1851 | | |
| Cymatopleura solea (Brébisson) W. Smith, 1851 | | |
| Cymbella cistula (Hemprich & Ehrenberg) O. Kirchner, 1878 | | |
| Cymbella cymbiformis C.A. Agardh, 1830 | | |
| Cymbella falaisiensis (Grunow) Krammer & Lange-Bertalot, 1985 | ''Navicula falaisiensis''; | |
| Cymbella inaequalis Grunow & Cleve, 1878 | ''Cymbella ehrenbergii''; | |
| Cymbomonas klebsii Schiller | | |
| Cyrtosphaera aculeata (Kamptner) A.Kleijne, 1992 | ''Acanthoica aculeata''; | |
| Cystodinium bataviense Klebs 1912 | | |
| Dactyliosolen fragilissimus (Bergon) G. R. Hasle, 1991 | ''Rhizosolenia fragillissima''; | |
| Detonula confervacea (P.T. Cleve) Gran, 1900 | | |
| Diatoma tenue C.A. Agardh, 1812 | ''Diatoma elongatum'' and ''Diatoma elongatum var. hybrida''; | |
| Diatoma vulgare Bory de Saint-Vincent, 1824 | | |
| Dictyocha crux Ehrenberg, 1840 | | |
| Dictyocha fibula Ehrenberg | | |
| Dictyocha speculum Ehrenberg | | |
| Dictyosphaerium ehrenbergianum Nägeli, 1849 | | |
| Dictyosphaerium pulchellum Wood, 1873 | | |
| Dinobryon balticum (Schütt) Lemmermann, 1900 | ''Dinobryon pellucidum''; | |
| Dinobryon sertularia Ehrenberg, 1834 | | |
| Dinophysis acuminata Claparède & Lachmann, 1859 | also ''Dinophysis baltica'' and ''Dinophysis levanderi'' and ''Dinophysis paulsenii''; | |
| Dinophysis acuta Ehrenberg, 1841 | | |
| Dinophysis apiculata Meunier, 1910 | | |
| Dinophysis arctica Mereschkowsky, 1879 | | |
| Dinophysis caudata Saville-Kent, 1881 | | |
| Dinophysis fortii Pavillard, 1923 | | |
| Dinophysis hastata Stein, 1883 | | |
| Dinophysis mucronata (Kofoid & Skogsberg 1928) Sournia, 1973 | | |
| Dinophysis norvegica Claparède & Lachmann, 1859 | | |
| Dinophysis ovum Schütt, 1895 | | |
| Dinophysis pulchella (Lebour) Balech | ''Phalacroma pulchellum''; | |
| Dinophysis sacculus Stein, 1883 | | |
| Dinophysis sphaerica Stein 1883 | | |
| Dinophysis tripos Gourret, 1883 | | |
| Diploneis didyma (Ehrenberg) P.T. Cleve, 1894 | | |
| Diploneis elliptica (Kützing) P.T. Cleve, 1894 | | |
| Diploneis interrupta (Kützing) P.T. Cleve, 1894 | | |
| Diploneis smithii (Brébisson in W. Smith) P.T. Cleve, 1894 | | |
| Diploneis smithii var. borealis | | |
| Diploneis vacillans (A. Schmidt) P.T. Cleve, 1894 | | |
| Diplopsalis acuta (Apstein) Entz 1904 | ''Peridinium latum''; | |
| Diplopsalis lenticula Bergh, 1881 | ''Glenodinium lenticula''; | |
| Diplopsalopsis orbicularis (Paulsen, 1907) Meunier, 1910 | ''Peridinium orbiculare''; | |
| Ditylum brightwellii (T. West) Grunow in Van Heurck, 1883 | | |
| Ebria tripartita (Shumann) Lemmermann, 1899 | | |
| Ellobiopsis chattoni Caullery, 1910 | | |
| Emiliania huxleyi (Lohmann) Hay & Mohler, 1967 | ''Pontosphaera huxleyi''; | |
| Encyonema minutum (Hilse in Rabenhorst) D.G. Mann in Round et al., 1990 | ''Cymbella ventricosa''; | |
| Endictya oceanica Ehrenberg, 1845 | | |
| Entomoneis alata (Ehrenberg) Ehrenberg, 1845 | ''Amphiprora alata''; | |
| Entomoneis paludosa (W. Smith) Reimer, 1975 | ''Amphiprora paludosa''; | |
| Epithemia adnata (Kützing) Brébisson, 1838 | ''Epithemia zebra''; | |
| Epithemia sorex Kützing, 1844 | | |
| Epithemia turgida (Ehrenberg) Kützing, 1844 | ''Cymbella turgida''; | |
| Eudorina elegans Ehrenberg, 1832 | | |
| Euglena acusformis J. Schiller | | |
| Euglena clara Skuja, 1948 | | |
| Euglena deses Ehrenberg, 1830 | | |
| Euglena granulata (G.A. Klebs) Schmitz, 1884 | | |
| Euglena leptocinclis elongata | | |
| Euglena oxyuris Schmarda, 1846 | | |
| Euglena pisciformis G.A. Klebs, 1883 | | |
| Euglena proxima Dangeard, 1901 | | |
| Euglena viridis (O.F. Müller) Ehrenberg, 1832 | | |
| Eutreptia lanowii Steuer, 1904 | | |
| Eutreptia viridis Perty | | |
| Fragilaria capucina Desmazières, 1825 | | |
| Fragilaria capucina var. vaucheriae (Kützing) Lange-Bertalot, 1980 | ''Fragilaria intermedia''; | |
| Fragilaria crotonensis Kitton, 1869 | | |
| Fragilaria hyalina (Kützing) Grunow, 1862 | | |
| Fragilaria striatula Lyngbye, 1819 | | |
| Fragilaria vaucheriae (Kützing) J.B. Petersen, 1938 | ''Synedra vaucheriae''; | |
| Fragilariforma virescens (Ralfs) Williams & Round, 1988 | ''Fragilaria virescens''; | |
| Glenodiniopsis steinii (Lemmermann) Woloszynska, 1916 | ''Sphaerodinium cinctum''; | |
| Glenodinium behningii (Lindemann, 1927) Kisseleva | | |
| Glenodinium caspicum (Ostenfeld) J. Schiller | | |
| Glenodinium inflatum Meunier | | |
| Glenodinium obliquum Pouchet | | |
| Glenodinium paululum Lindemann | | |
| Glenodinium pilula (Ostenfeld) Schiller | | |
| Glenodinium pulvisculus (Ehrenberg) Stein | | |
| Gomphonema olivaceum (Hornemann) Brébisson, 1838 | | |
| Gomphonema olivaceum var. minutissimum Hustedt | | |
| Goniodoma polyedricum (Pouchet, 1883) Jørgensen, 1899 | | |
| Gonium pectorale O.F.Müller 1773 | | |
| Gonyaulax cochlea Meunier, 1919 | | |
| Gonyaulax diegensis Kofoid, 1911 | | |
| Gonyaulax digitale (Pouchet, 1883) Kofoid, 1911 | | |
| Gonyaulax fragilis (Schütt, 1895) Kofoid, 1911 | | |
| Gonyaulax minima Matzenauer, 1933 | | |
| Gonyaulax orientalis Lindemann, 1924 | | |
| Gonyaulax polygramma Stein, 1883 | | |
| Gonyaulax scrippsae Kofoid, 1911 | | |
| Gonyaulax spinifera (Claparède & Lachmann, 1859) Diesing, 1866 | also ''Peridinium spiniferum''; | |
| Gonyaulax verior Sournia, 1973 | ''Gonyaulax diacantha''; | |
| Grammatophora angulosa Ehrenberg, 1841 | | |
| Grammatophora marina (Lyngbye) Kützing, 1844 | | |
| Grammatophora oceanica Ehrenberg, 1841 | | |
| Grammatophora serpentina (Ralfs) Ehrenberg | | |
| Guinardia delicatula (Cleve) G.R. Hasle, 1996 | ''Rhizosolenia delicatula''; | |
| Gymnodinium agile Kofoid et Swezy | | |
| Gymnodinium agiliforme Schiller, 1928 | | |
| Gymnodinium fusus Schütt, 1896 | | |
| Gymnodinium grammaticum (Pouchet, 1887) Kofoid & Swezy, 1921 | | |
| Gymnodinium helveticum Penard 1891 | ''Glenodinium apiculatum''; | |
| Gymnodinium marinum Saville-Kent, 1881 | | |
| Gymnodinium minor Lebour | | |
| Gymnodinium najadeum Schiller, 1928 | | |
| Gymnodinium neapolitanum Schiller, 1928 | | |
| Gymnodinium rhomboides Schütt, 1895 | | |
| Gymnodinium semidivisum Schiller, 1928 | | |
| Gymnodinium sulcatum Kofoid & Swezy, 1921 | | |
| Gymnodinium wulffii Schiller, 1933 | | |
| Gyrodinium britannicum Koifoid & Swezy, 1921 | | |
| Gyrodinium capsulatum Kofoid et Swezy, 1921 | | |
| Gyrodinium dorsum Kofoid & Swezy, 1921 | | |
| Gyrodinium fissum (Levander, 1894) Kofoid & Swezy, 1921 | | |
| Gyrodinium fusus (Meunier, 1910) Akselman, 1985 | | |
| Gyrodinium lachryma (Meunier, 1910) Kofoid & Swezy, 1921 | | |
| Gyrodinium nasutum (Wulff, 1916) Schiller, 1933 | | |
| Gyrodinium pingue (Schütt, 1895) Kofoid et Swezy, 1921 | | |
| Gyrodinium spirale (Bergh, 1881) Kofoid et Swezy, 1921 | | |
| Gyrosigma balticum (Ehrenberg) Rabenhorst | ''Pleurosigma balticum''; | |
| Gyrosigma distortum (W. Smith) Griffith & Henfrey, 1856 | | |
| Gyrosigma distortum var. parkeri (Harrison) Cleve, 1894 | | |
| Gyrosigma kuetzingii (Grunow) Cleve | | |
| Gyrosigma rectum (Donk.) Cleve, 1894 | | |
| Gyrosigma spectabile (Grunow) Cleve | ''Nitzschia spectabilis''; | |
| Gyrosigma tenuissimum (W. Smith) Griffith & Henfrey, 1856 | | |
| Halosphaera viridis Schmitz | | |
| Hantzschia amphioxys (Ehrenberg) Grunow in Cleve & Grunow, 1880 | | |
| Hemiaulus hauckii Grunow in Van Heurck, 1882 | | |
| Herdmania litoralis Dodge, 1981 emend. Hoppenrath, 2000 | | |
| Hermesinum adriaticum O.Zacharias, 1906 | | |
| Heterocapsa rotundata (Lohmann, 1908) G. Hansen, 1995 | ''Massartia rotundata''; | |
| Heterocapsa triquetra (Ehrenberg, 1840) Stein, 1883 | ''Peridinium triquetrum''; | |
| Hexasterias problematica Cleve, 1900 | | |
| Hyalodiscus ambiguus (Grun.) Temp. Et Perag. 1890 | | |
| Hyalodiscus laevis Ehrenb., 1845 | | |
| Hyalodiscus scoticus (Kützing) Grunow, 1879 | | |
| Hypnodinium sphaericum Klebs, 1912 | | |
| Kirchneriella lunaris (Kirchner) K. Möbius, 1894 | | |
| Kryptoperidinium foliaceum (Stein, 1883) Lindemann, 1924 | ''Glenodinium foliaceum''; | |
| Leptocylindrus adriaticus Schroder | | |
| Leptocylindrus danicus P.T. Cleve, 1889 | | |
| Leptocylindrus minimus Gran, 1915 | | |
| Licmophora abbreviata C.A. Agardh, 1831 | | |
| Licmophora ehrenbergii (Kützing) Grunow, 1867 | | |
| Licmophora flabellata C. Agardh, 1830 | | |
| Licmophora gracilis (Ehrenberg) Grunow, 1867 | | |
| Limnothrix planctonica (Woloszynska) Meffert, 1988 | ''Oscillatoria planctoniella''; | |
| Lingulodinium polyedrum (Stein, 1883) Dodge, 1989 | ''Gonyaulax polyedra''; | |
| Lohmannosphaera subclausa Gran et Braarud | | |
| Lyngbya confervoides C. Agardh ex Gomont, 1892 | | |
| Lyngbya semiplena (C. Agardh) J. Agardh, 1842 | | |
| Lyrella atlantica (Schmidt) D.G.Mann in F.E. Round, R.M. Crawford & D.G. Mann, 1990 | ''Navicula lyra var. atlantica''; | |
| Lyrella hennedyi (W. Sm.) Stickle & D. G. Mann, 1990 | ''Navicula hennedyi''; | |
| Lyrella lyra (Ehrenb.) Karayeva, 1978 | ''Navicula lyra''; | |
| Mallomonas lilloensis | | |
| Melosira arenaria Moore ex Ralfs, 1843 | | |
| Melosira dubia C.G. Kützing, 1844 | | |
| Melosira granulata var. curvata Grunow | | |
| Melosira islandica O.F.Müller, 1906 | | |
| Melosira lineata (Dillwyn) C.A. Agardh, 1824 | ''Melosira juergensi''; | |
| Melosira lineata var. subangularis (Grunow) M. Aboal | '' Melosira juergensii var. subangularis''; | |
| Melosira moniliformis (O.F. Müller) C. Agardh, 1824 | | |
| Melosira moniliformis var. hispida (Castr.) Hust. | | |
| Melosira moniliformis var. octogona (Grunow) Hustedt | | |
| Melosira moniliformis var. subglobosa (Grunow) Hustedt | | |
| Melosira nummuloides C.A. Agardh, 1824 emend. Crawford, 1975 | | |
| Melosira varians C.A. Agardh, 1827 | | |
| Meringosphaera mediterranea Lohmann, 1902 | | |
| Meringosphaera merzi Schiller | | |
| Merismopedia glauca (Ehrenberg) Kützing, 1845 | | |
| Merismopedia glauca f. mediterranea (Nägeli) Collinsin Collins, Holden, & Setchell, 1910 [1895-1919] | | |
| Merismopedia minima Beck, 1897 | | |
| Merismopedia punctata Meyen, 1939 | | |
| Merismopedia tenuissima Lemmermann, 1898 | | |
| Mesoporos perforatus (Gran) Lillick 1937 | ''Exuviaella perforata''; | |
| Micractinium pusillum Fresenius, 1858 | | |
| Micractinium quadrisetum (Lemmermann) G.M. Smith, 1916 | | |
| Microcystis aeruginosa (Kützing) Kützing, 1846 | | |
| Microcystis ichthyoblabe Kützing, 1843 | | |
| Microcystis pulverea (Wood) Forti in De Toni, 1907 sensu auct. | | |
| Monomorphina pyrum (Ehrenberg) Mereschkowski 1877 | | |
| Monoraphidium contortum (Thuret) Komàrková-Legnerová, 1969 | ''Ankistrodesmus angustus''; | |
| Monoraphidium griffithii (Berkeley) Komárková-Legnerová, 1969 | ''Ankistrodesmus acicularis''; | |
| Navicula cancellata Donkin, 1872 | | |
| Navicula digitoradiata (Gregory) Ralfs in Pritchard, 1861 | | |
| Navicula directa (W. Smith) Ralfs in Pritchard, 1861 | ''Pinnularia directa''; | |
| Navicula exigua Gregory, 1854 | | |
| Navicula gregaria Donkin, 1861 | ''Navicula cryptocephala''; | |
| Navicula latissima var. capitata Pantocsek | | Doubtful |
| Navicula palpebralis de Brébisson, 1853 | | |
| Navicula pennata A. Schmidt, 1876 | | |
| Navicula pennata var. pontica Mer. | | |
| Navicula radiosa Kützing, 1844 | | |
| Navicula retusa var. retusa | ''Navicula cancellata var. retusa''; | |
| Navicula rhynchocephala Kützing, 1844 | | |
| Navicula slesvicensis Grunow, 1880 | '' Navicula viridula var. slesvicensis''; | |
| Navicula tripunctata (O.F. Müller) Bory, 1822 | ''Navicula gracilis''; | |
| Navicula viridula (Kützing) Ehrenberg, 1838 | | |
| Neoceratium candelabrum (Ehrenberg) F.Gómez, D.Moreira & P.López-Garcia, 2001 | ''Ceratium candelabrum''; | |
| Neoceratium extensum (Gourret) F.Gomez, D.Moreira & P.Lopez-Garcia, 2009 | ''Ceratium extensum''; | |
| Neoceratium furca (Ehrenberg) F.Gomez, D.Moreira & P.Lopez-Garcia, 2009 | ''Ceratium furca''; | |
| Neoceratium furca var. berghii (Jørg.) Krachmalny, 2011 | ''Ceratium furca var. berghii''; | |
| Neoceratium fusus (Ehrenberg) F.Gomez, D.Moreira & P.Lopez-Garcia, 2009 | ''Ceratium fusus''; | |
| Neoceratium inflatum (Kofoid) F.Gomez, D.Moreira & P.Lopez-Garcia, 2009 | ''Ceratium inflatum''; | |
| Neoceratium lineatum (Ehrenberg) F.Gomez, D.Moreira & P.Lopez-Garcia, 2009 | ''Ceratium lineatum''; | |
| Neoceratium macroceros (Ehrenberg) F.Gomez, D.Moreira & P.Lopez-Garcia, 2009 | ''Ceratium macroceros''; | |
| Neoceratium massiliense (Gourret) F.Gomez, D.Moreira & P.Lopez-Garcia, 2009 | ''Ceratium protuberans''; | |
| Neoceratium minutum (Jørgensen) F.Gomez, D.Moreira & P.Lopez-Garcia, 2009 | ''Ceratium minutum''; | |
| Neoceratium pentagonum (Gourret) F.Gomez & P.Lopez-Garcia, 2009 | ''Ceratium pentagonum''; | |
| Neoceratium tripos (O.F.Müller) F.Gomez, D.Moreira & P.Lopez-Garcia, 2009 | ''Ceratium tripos''; | |
| Nitzschia acicularis (Kützing) W. Smith, 1853 | | |
| Nitzschia actinastroides (Lemm.) Van Goor | ''Synedra actinastroides''; | |
| Nitzschia closterium (Ehrenberg) W. Smith, 1853 | | |
| Nitzschia commutata Grunow in Cleve & Grunow, 1880 | | Doubtful |
| Nitzschia constricta (Gregory) Grunow in Cleve & Grunow, 1880 | | |
| Nitzschia constricta f. parva Grunow | | |
| Nitzschia dissipata (Kützing) Grunow, 1862 | | |
| Nitzschia holsatica Hust | | |
| Nitzschia incerta (Grunow) M.Peragallo 1903 | ''Nitzschia reversa''; | |
| Nitzschia insignis | | |
| Nitzschia lanceolata W. Smith | | |
| Nitzschia longissima (Brébisson in Kützing) Ralfs in Pritchard, 1861 | | |
| Nitzschia lorenziana Grunow in Cleve & Grunow, 1880 | | |
| Nitzschia obtusa W. Smith, 1853 | | |
| Nitzschia palea (Kützing) W. Smith, 1856 | | |
| Nitzschia palea var. capitata Wisl. & Poretzky | | |
| Nitzschia pungens var. atlantica Cleve | | |
| Nitzschia sigma (Kützing) W. Smith, 1853 | | |
| Nitzschia sigmoidea (Ehrenberg) W. Smith | | |
| Nitzschia tenuirostris Mer. | | |
| Nitzschia vermicularis (Kützing) Hantzsch in Rabenhorst, 1860 (1859) | | |
| Noctiluca scintillans (Macartney, 1810) Kofoid, 1920 | ''Noctiluca miliaris''; | |
| Nodularia spumigena Mertens in Jürgens, 1822 | | |
| Nylea fusiforme | | |
| Oblea rotunda (Lebour, 1922) Balech, 1964 ex Sournia, 1973 | ''Glenodinium rotundum''; | |
| Odontella mobiliensis (J.W. Bailey) Grunow, 1884 | ''Biddulphia mobiliensis''; | |
| Oestrupia musca (Gregory) Hustedt, 1935 | ''Caloneis musca''; | |
| Oocystis borgei J. Snow, 1903 | | |
| Oocystis elliptica West, 1892 | | |
| Oocystis novae-semliae Wille | | |
| Oocystis pelagica Lemmermann | | |
| Oocystis solitaria Wittrock in Wittrock & Nordstedt, 1879 | | |
| Oolithotus fragilis (Lohmann) Martini & C.Müller, 1972 | ''Coccolithophora fragilis''; | |
| Opisthoaulax vorticella (F. Stein) Calado, 2011 | ''Massartia vorticella''; | |
| Oscillatoria bonnemaisonii Crouan in Desmazières ex Gomont, 1892 | | |
| Oscillatoria kisselevii Anissimova 1949 | | |
| Oxyrrhis marina Dujardin, 1841 | | |
| Palusphaera vandeli Lecal, 1967 | ''Rhabdosphaera longistylis''; | |
| Pandorina mora (O.F. Müller) Bory de Saint-Vincent, 1824 | ''Pandorina morum''; | |
| Paradoxia multiseta Svirenko 1927 | | |
| Paralia sulcata (Ehrenberg) P.T. Cleve, 1873 | ''Melosira sulcata''; | |
| Paulsenella chaetoceratis (Paulsen) Chatton | | |
| Pediastrum boryanum (Turpin) Meneghini, 1840 | | |
| Pediastrum duplex Meyen, 1829 | | |
| Pediastrum tetras var. tetraodon (Corda) Hansgirg | | |
| Peridiniella danica (Paulsen, 1907) Okolodkov et Dogde, 1995 | ''Glenodinium danicum''; | |
| Peridiniopsis oculatum (F.Stein) Bourrelly, 1968 | ''Glenodinium oculatum''; | |
| Peridinium aciculiferum Lemmermann, 1900 | | |
| Peridinium bipes Stein | ''Peridinium bipes f. tabulatum''; | |
| Peridinium cinctum (O.F.Müller) Ehrenberg | | |
| Peridinium knipowitzschii Ussatschew | | |
| Peridinium latum var. halophyla | | |
| Peridinium leonis var. concavilaterale I.A. Kisselev | | |
| Peridinium longispinum Kofoid | | |
| Peridinium umbonatum F. Stein, 1883 | ''Peridinium inconspicuum''; | |
| Peridinium willei Huitfeld-Kaas | | |
| Petrodictyon gemma (Ehrenberg) D.G. Mann in Round et al., 1990 | ''Surirella gemma''; | |
| Petroneis humerosa (Brébisson ex W. Smith) A.J. Stickle & D.G. Mann, 1990 | ''Navicula humerosa''; | |
| Phalacroma acutum (Schütt, 1895) Pavillard, 1916 | | |
| Phalacroma minutum Cleve, 1900 | | |
| Phalacroma ovatum (Claparède et Lachmann, 1859) Jørgensen, 1923 | | |
| Phalacroma rotundata (Claparéde & Lachmann) Kofoid & Michener, 1911 | also ''Phalacroma rudgei''; | |
| Phalacroma sphaeroideum Schiller, 1928 | | |
| Phormidium limosum (Dillwyn) P.C. Silva, 1996 | ''Oscillatoria tenuis''; | |
| Phormidium nigroviride (Thwaites ex Gomont) Anagnostidis & Komárek, 1988 | ''Oscillatoria nigroviridis''; | |
| Phormidium tergestinum (Kützing) Anagnostidis & Komárek, 1988 | | |
| Pinnularia directa var. angusta | | |
| Pinnularia directa var. quadratareae | | |
| Pinnularia rectangulata (Gregory) Rabenhorst | | |
| Placoneis elginensis (Gregory) E.J. Cox, 1988 | ''Navicula anglica''; | |
| Placoneis placentula (Ehrenberg) Mereschkowsky, 1903 | ''Navicula placentula''; | |
| Plagiotropis lepidoptera (Gregory) Kuntze, 1898 | ''Tropidoneis lepidoptera''; | |
| Planktoniella sol | | |
| Planothidium lanceolatum (Brébisson) Round & Bukhtiyarova, 1996 | ''Achnanthes lanceolata''; | |
| Pleurosigma angulatum (Quekett, 1848) Wm. Smith, 1853 | | |
| Pleurosigma angulatum var. strigosa W. Smith | | |
| Pleurosigma elongatum W. Smith, 1852 | | |
| Pleurosigma formosum Wm. Smith | | |
| Pleurosigma normanii Ralfs in Pritchard. | | |
| Pleurosigma rigidum Smith, 1853 | | |
| Pleurosira laevis (Ehrenberg) Compère, 1982 | ''Biddulphia laevis''; | |
| Podosira hormoides (Montagne) Kützing | | |
| Polykrikos schwartzii Bütschli 1873 | | |
| Pontosphaera bigelowi Gran & Braarud 1935 | | |
| Pontosphaera haeckelii Lohmann | | |
| Pontosphaera hartmanni Schiller | | |
| Pontosphaera nigra Schiller | | |
| Porosira glacialis (Grunow) E. Jørgensen, 1905 | | |
| Preperidinium meunierii (Pavillard, 1907) Elbrächter, 1993 | ''Glenodinium lenticula f. minor''; | |
| Proboscia alata (Brightwell) Sundström, 1986 | ''Rhizosolenia alata''; | |
| Prorocentrum balticum (Lohmann, 1908) Loeblich, 1970 | ''Exuviaella baltica''; | |
| Prorocentrum caspica (Kiselev) Krachmalny 1993 | ''Exuviaella caspica''; | |
| Prorocentrum compressum (Bailey, 1850) Abé ex Dodge, 1975 | ''Exuviaella compressa''; | |
| Prorocentrum cordatum (Ostenfeld, 1901) Dodge, 1975 | ''Exuviaella cordata''; | |
| Prorocentrum cordatum var. aralensis (Kiselev) Krachmalny 1993 | ''Exuviaella cordata var. aralensis''; | |
| Prorocentrum lima (Ehrenberg, 1860) Stein, 1975 | ''Exuviaella marina'' and as ''Exuviaella marina var. lima''; | |
| Prorocentrum micans Ehrenberg, 1834 | | |
| Prorocentrum nanum Schiller, 1918 | ''Exuviaella pusilla''; | |
| Prorocentrum obtusum Ostenfeld, 1908 | | |
| Prorocentrum scutellum Schröder, 1900 | | |
| Prorocentrum vaginula (Stein, 1883) Dodge 1975 | ''Exuviaella vaginula''; | |
| Protoceratium reticulatum (Claparède et Lachmann, 1859) Bütschli, 1885 | | |
| Protoperidinium achromaticum (Levander, 1902) Balech, 1974 | ''Peridinium achromaticum''; | |
| Protoperidinium bipes (Paulsen, 1904) Balech, 1974 | ''Peridinium minusculum''; | |
| Protoperidinium brevipes (Paulsen, 1908) Balech, 1974 | ''Peridinium brevipes''; | |
| Protoperidinium brochii (Kofoid & Swezy) Balech | ''Peridinium brochii''; | |
| Protoperidinium claudicans (Paulsen, 1907) Balech, 1974 | ''Peridinium claudicans''; | |
| Protoperidinium conicoides (Paulsen, 1905) Balech, 1973 | ''Peridinium conicoides''; | |
| Protoperidinium conicum (Gran, 1900) Balech, 1974 | ''Peridinium conicum'' and ''Peridinium conicum f. concava''; | |
| Protoperidinium crassipes (Kofoid, 1907) Balech, 1974 | ''Peridinium crassipes''; | |
| Protoperidinium decipiens (Jørgensen, 1899) Parke et Dodge, 1976 | ''Peridinium decipiens''; | |
| Protoperidinium depressum (Bailey, 1850) Balech, 1974 | ''Peridinium depressum''; | |
| Protoperidinium diabolum (Cleve) Balech, 1974 | ''Peridinium diabolus''; | |
| Protoperidinium divergens (Ehrenberg, 1841) Balech, 1974 | ''Peridinium divergens''; | |
| Protoperidinium elegans (Cleve, 1900) Balech, 1974 | ''Peridinium elegans''; | |
| Protoperidinium excentricum (Paulsen, 1907) Balech, 1974 | ''Peridinium excentricum''; | |
| Protoperidinium globulus (Stein, 1883) Balech, 1974 | ''Peridinium globulus''; | |
| Protoperidinium granii (Ostenfield, 1906) Balech, 1974 | ''Peridinium granii''; | |
| Protoperidinium oceanicum (VanHöffen, 1897) Balech, 1974 | ''Peridinium oceanicum''; | |
| Protoperidinium ovatum Pouchet, 1883 | ''Peridinium globulus var. ovatum''; | |
| Protoperidinium pallidum (Ostenfeld, 1899) Balech, 1973 | ''Peridinium pallidum''; | |
| Protoperidinium pedunculatum (Schütt) Balech, 1895 | '' Peridinium pedunculatum''; | |
| Protoperidinium pellucidum Bergh, 1882 | ''Peridinium pellucidum''; | |
| Protoperidinium pentagonum (Gran, 1902) Balech, 1974 | ''Peridinium pentagonum''; | |
| Protoperidinium pyriforme (Paulsen, 1907) Balech, 1974 | ''Peridinium pyriforme''; | |
| Protoperidinium quarnerense (Schröder, 1900) Balech, 1974 | ''Peridinium globulus var. quarnerense''; | |
| Protoperidinium solidicorne (Mangin, 1922) Balech, 1974 | ''Peridinium solidicorne''; | |
| Protoperidinium steinii (Jörgensen, 1899) Balech, 1974 | ''Peridinium steinii''; | |
| Protoperidinium subinerme (Paulsen, 1904) Loeblich III, 1970 | ''Peridinium subinerme''; | |
| Prymnesium parvum N. Carter, 1937 | | |
| Psammodictyon panduriforme (Greg.) Mann | ''Nitzschia panduriformis''; | |
| Psammodiscus nitidus (Gregory) Round & D.G. Mann, 1980 | | |
| Pseudo-nitzschia delicatissima (P.T. Cleve, 1897) Heiden, 1928 | ''Nitzschia delicatissima''; | |
| Pseudo-nitzschia seriata (P.T. Cleve, 1883) H. & M. Peragallo, 1900 | ''Nitzschia seriata''; | |
| Pseudosolenia calcar-avis (Schultze) Sundström, 1986 | ''Rhizosolenia calcar-avis''; | |
| Pteromonas torta O.A. Korshikov 1938 | | |
| Pterosperma cristatum Schiller, 1925 | | |
| Pterosperma hemisphaericum | | |
| Pterosperma jorgensii Shiller | | |
| Pterosperma ornatum | | |
| Pyramidomonas adriaticus | | |
| Pyrocystis lunula (Schütt) Schütt, 1896 | | |
| Pyrophacus horologicum Stein, 1883 | | |
| Raphidocelis contorta (Schmidle) Marvan et al., 1984 | ''Kirchneriella contorta''; | |
| Rhabdonema adriaticum Kützing, 1844 | | |
| Rhabdosphaera claviger Murray & Blackman, 1898 | ''Rhabdosphaera stylifer''; | |
| Rhabdosphaera hispida Lohmann | | |
| Rhabdosphaera tubulosa Schiller | | |
| Rhizosolenia acuminata (Peragallo 1892) Gran, 1905 | | |
| Rhodomonas baltica Karsten | | |
| Rhoicosphenia abbreviata (C.A. Agardh) Lange-Bertalot, 1980 | ''Rhoicosphenia curvata''; | |
| Rhopalodia gibba (Ehrenberg) G.F.O. Müller, 1895 | | |
| Rhopalodia gibba var. ventricosa (Kützing) H.Peragallo & M.Peragallo, 1900 | | |
| Rhopalodia gibberula (Ehrenberg) O.F. Müller, 1895 | | |
| Rhopalodia musculus (Kützing) O.F. Müller, 1900 | | |
| Richelia intracellularis J. Schmidt, 1901 | | |
| Scenedesmus abundans (O. Kirchner) Chodat, 1913 | ''Scenedesmus quadricauda var. abundans''; | |
| Scenedesmus acuminatus var. biseriatus | | |
| Scenedesmus arcuatus Lemmermann, 1899 | | |
| Scenedesmus bijugatus var. alternans (Reinsch) Hansgirg | | |
| Scenedesmus magnus Meyen, 1829 | ''Scenedesmus quadricauda var. setosus''; | |
| Scenedesmus obliquus (Turpin) Kützing, 1833 | also ''Scenedesmus bijugatus''; | |
| Scenedesmus obliquus var. alterans | | |
| Scenedesmus opoliensis var. carinatus Lemmermann, 1899 | | |
| Scenedesmus quadricauda (Turpin) Brébisson in Brébisson & Godey, 1835 | | |
| Scenedesmus quadricauda var. armatus (Chodat) Deduss | | |
| Scenedesmus quadricauda var. eualternans | | |
| Scenedesmus tetradesmiformis (Wolosz.) Chodat | | |
| Schroederia setigera (Schröder) Lemmermann, 1898 | | |
| Scrippsiella trochoidea (Stein, 1883) Balech ex Loeblich III, 1965 | ''Peridinium trochoideum''; | |
| Selenastrum bibraianum Reinsch 1867 | | |
| Skeletonema costatum (Greville) P.T. Cleve, 1878 | | |
| Sphaerocystis schroeteri Chodat, 1897 | ''Gloeococcus schroeteri''; | |
| Spirulina meneghiniana Zanardini ex Gomont, 1892 | | |
| Spirulina tenuissima Kutzing | | |
| Stauridium tetras (Ehrenberg) E. Hegewald | ''Pediastrum tetras''; | |
| Staurosira construens Ehrenberg, 1843 | ''Fragilaria construens''; | |
| Stephanodiscus astraea | | |
| Stephanodiscus hantzschii Grunow in P.T. Cleve & Grunow, 1880 | | |
| Stephanodiscus minutulus (Kützing) P.T. Cleve & Möller 1978 | ''Stephanodiscus astraea var. minutula''; | |
| Stephanodiscus subsalsus (A. Cleve) Hustedt | | |
| Stephanopyxis turris (Greville) Ralfs ex Pritchard, 1861 | | |
| Striatella delicatula (Kützing) Grunow ex Van Heurck, 1881 | | |
| Striatella interrupta (Ehrenb.) Grunow., 1862 | | |
| Striatella unipunctata (Lyngb.) Ag. | | |
| Strombomonas fluviatilis (Lemmermann) Deflandre 1930 | | |
| Strombomonas longa (Swirenko) Popowa 1955 | | |
| Surirella fastuosa (Ehrenberg) Kützing, 1844 | | |
| Surirella gemma var. reniformis (A. Grunow) A.I. Proshkina-Lavrenko | | |
| Surirella minuta Brébisson in Kützing, 1849 | ''Surirella ovata''; | |
| Surirella ovalis Brébisson, 1838 | | |
| Surirella spiralis Kützing, 1844 | | |
| Surirella striatula Turpin, 1828 | | |
| Synechococcus elongatus (Nägeli) Nägeli 1849 | | |
| Synedra acus var. angustissima (Grunow in Van Heurck) Van Heurck, 1885 | | |
| Synedra baculus Gregory 1857 | | |
| Synedra berolinensis Lemmermann, 1900 | | |
| Synedra biceps Kützing, 1844 | ''Synedra ulna var. biceps''; | |
| Synedra brockmanii Hust. | | |
| Synedra capitata Ehrenberg, 1836 | | |
| Synedra curvata Pr. Lavrenko | | |
| Synedra gaillonii (Bory de Saint-Vincent) Ehrenberg, 1834 | | |
| Synedra parva Kützing | ''Synedra tabulata var. parva''; | |
| Synedra subsalsus | | |
| Synedra tabulata var. grandis Mereschk. | | |
| Synedra tabulata var. intermedia Grunow | | |
| Synedra ulna var. aequalis (Kützing) Hustedt | | |
| Synedra ulna var. danica (Kützing) Van Heurck, 1885 | | |
| Syracosphaera cordiformis Schiller, 1913 | | |
| Syracosphaera dentata Lohmann | | |
| Syracosphaera pulchra Lohmann | | |
| Tabularia fasciculata (C. Agardh) D.M. Williams & Round, 1986 | ''Synedra tabulata'' and ''Synedra tabulata var. fasciculata'' and '' Synedra tabulata var. obtusa''; | |
| Tetradesmus lunatus | | |
| Tetradesmus wisconsinensis G.M.Smith | | |
| Tetraedron caudatum (Corda) Hansgirg 1888 | | |
| Tetraedron schmidlei (Schroed.) Lemm Rabh. 1868 | | |
| Tetrastrum glabrum (Y.V. Roll) Ahlstrom & Tiffany | | |
| Tetrastrum multisetum (Schmidle) Chodat | | |
| Tetrastrum staurogeniaeforme (Schroeder) Lemmerman, 1900 | | |
| Thalassionema frauenfeldii (Grunow) Hallegraeff, 1986 | ''Thalassiothrix frauenfeldii''; | |
| Thalassionema nitzschioides (Grunow, 1862) Van Heurck, 1896 | | |
| Thalassiosira angulata (Gregory) Hasle, 1978 | ''Thalassiosira decipiens''; | |
| Thalassiosira antiqua var. septata Proschkina-Lavrenko 1955 | | |
| Thalassiosira baltica (Grunow in P.T. Cleve & Grunow) Ostenfeld, 1901 | ''Thalassiosira subsalina'' and as ''Coscinodiscus subtilis''; | |
| Thalassiosira coronifera Pr. Lavrenko | | |
| Thalassiosira eccentrica (Ehrenberg) P.T. Cleve, 1903-1904 | | |
| Thalassiosira excentrica var. fasciculata Hustedt | | |
| Thalassiosira gravida P.T. Cleve, 1896 | | |
| Thalassiosira leptopus (Grunow In Van Heurck) Fryxell et Hasle, 1977 | ''Coscinodiscus lineatus''; | |
| Thalassiosira oestrupii (Ostenfeld) Hasle | ''Coscinosira oestrupii''; | |
| Thalassiosira ornata Proshkina-Lavrenko 1959 | | |
| Thalassiosira parva Proshk.-Lavr., 1955 | | |
| Thalassiosira tenera Proshkina-Lavrenko, 1961 | | |
| Thalassiothrix longissima P.T. Cleve & Grunow, 1880 | | |
| Torodinium robustum Kofoid & Swezy, 1921 | | |
| Toxarium hennedyanum (Gregory) Pelletan, 1889 | ''Synedra hennedyana''; | |
| Toxarium undulatum J.W. Bailey, 1854 | ''Synedra undulata''; | |
| Trachyneis aspera (Ehrenberg) Cleve | ''Stauroneis aspera''; | |
| Triceratium antediluvianum (Ehrenberg) Grunow in Hustedt, 1927 | | |
| Trochiscia brachiolata (Möbius) Lemmermann | | |
| Trochiscia centrota Schiller | | |
| Trochiscia paucispinosa W. West | | |
| Tryblionella acuta (Cleve) D.G. Mann 1990 | ''Nitzschia acuta''; | |
| Tryblionella apiculata Gregory, 1857 | ''Nitzschia apiculata''; | |
| Tryblionella compressa (J.W. Bailey) M. Poulin in Poulin et al., 1990 | ''Nitzschia punctata''; | |
| Tryblionella gracilis W. Smith, 1853 | ''Nitzschia tryblionella''; | |
| Tryblionella hungarica (Grunow) Frenguelli, 1942 | ''Nitzschia hungarica''; | |
| Tryblionella levidensis W. Smith, 1856 | ''Nitzschia tryblionella var. levidensis''; | |
| Tryblionella victoriae Grunow, 1862 | ''Nitzschia tryblionella var. victoriae''; | |
| Ulnaria acus (Kütz.) Aboal, 2003 | ''Synedra acus''; | |
| Ulnaria ulna (Nitzsch) P. Compère in Jahn et al., 2001 | ''Synedra ulna''; | |