1. Genus Conticribra K. Stachura-Suchoples & D.M. Williams, 2009
   1. Species Conticribra sinica P.Yu, Q.You & Q.Wang, 2022
   2. Species Conticribra weissflogii (Grunow) K.Stachura-Suchoples & D.M.Williams, 2009 †
   3. Species Conticribra weissflogiopsis J.S.Park & J.H.Lee, 2014 †
   4. Species Conticribra nevadica (Khursevich & Van Landingham) K.Stachura-Suchoples & D.M.Williams, 2009 † accepted as Spicaticribra nevadica (Khursevich & Van Landingham) Khursevich & Kociolek †
   5. Species Conticribra tricircularis K.Stachura-Suchoples & D.M.Williams, 2009 † accepted as Spicaticribra tricircularis (Stachura-Suchoples & D. M. Williams) Kociolek & Khursevich in Khursevich & Kociolek, 2012 † (synonym)
   6. Species Conticribra guillardii (Hasle) K.Stachura-Suchoples & D.M.Williams, 2009 † accepted as Thalassiosira guillardii Hasle, 1978 (uncertain > unassessed)
2. Genus Coscinosira H.H. Gran, 1900
   1. Species Coscinosira stellaris (F.C.S.Roper) H.Heiden
      1. Forma Coscinosira stellaris f. laevis Heiden in Heiden & Kolbe, 1928 (uncertain > unassessed)
      2. Forma Coscinosira stellaris f. symbolophora (Grunow) Heiden in Heiden & Kolbe, 1928 accepted as Coscinodiscus symbolophorus f. symbolophorus Grunow, 1884 (uncertain > unassessed)
      3. Variety Coscinosira stellaris var. stellaris (Roper) Heiden in Heiden & Kolbe, 1928 accepted as Coscinodiscus stellaris var. stellaris Roper, 1858 (uncertain > unassessed)
   2. Species Coscinosira oestrupii Ostenfeld, 1900 represented as Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
   3. Species Coscinosira antarctica Manguin, 1915 (uncertain > unassessed)
   4. Species Coscinosira antarctica Kozlova, 1962 (uncertain > unassessed)
   5. Species Coscinosira antarctica Kozlova, 1967 (uncertain > unassessed)
   6. Species Coscinosira atlantica P.-A.Dangeard, 1927 (uncertain > unassessed)
   7. Species Coscinosira bioculata (Grunow) Heiden in Heiden & Kolbe, 1928 accepted as Coscinodiscus bioculatus var. bioculatus Grunow, 1884 (uncertain > unassessed)
   8. Species Coscinosira cruciata Heiden in Heiden & Kolbe, 1928 (uncertain > unassessed)
   9. Species Coscinosira floridana I.C.G.Cooper, 1958 (uncertain > unassessed)
   10. Species Coscinosira mediterranea Schröder, 1911 (uncertain > unassessed)
   11. Species Coscinosira ornata Proschkina-Lavrenko, 1961 (uncertain > unassessed)
   12. Species Coscinosira polychorda (Gran) Gran, 1900 accepted as Coscinodiscus polychordus Gran, 1897 (uncertain > unassessed)
   13. Species Coscinosira poroseriata Ramsfjell, 1959 (uncertain > unassessed)
   14. Species Coscinosira sybilla Robinson, 1948 (uncertain > unassessed)
3. Genus Lineaperpetua Yu, You, Kociolek & Q.Wang
   1. Species Lineaperpetua lacustris (Grunow) Yu, You, Kociolek & Wang 2024
4. Genus Livingstonia A.K.S.K. Prasad in Prasad & Nienow, 2011
   1. Species Livingstonia palatkaensis A.K.S.K.Prasad & J.A.Nienow, 2011 (uncertain > unassessed)
5. Genus Mediolabrus Yang Li, 2020
   1. Species Mediolabrus comicus (H.Takano) Yang Li, 2020
6. Genus Microsiphona C.I. Weber, 1970
   1. Species Microsiphona potamos C.I.Weber, 1970 (uncertain > unassessed)
7. Genus Minidiscus G.R. Hasle, 1973 emend Park in Park et al., 2017
   1. Species Minidiscus alphacrucis L. F. Fernandes in Fernandes & Correr-da-Silva, 2020
   2. Species Minidiscus proschkinae (Makarova) J.S.Park & J.H.Lee in Park et al., 2017
   3. Species Minidiscus spinulatus (Takano) J.S.Park & J.H.Lee in Park et al., 2017
   4. Species Minidiscus variabilis Kaczmarska, 2009
   5. Species Minidiscus vodyanitskiyi A.M.Lyakh & Ye.D.Bedoshvili, 2018
   6. Species Minidiscus comicus H.Takano, 1983 accepted as Mediolabrus comicus (H.Takano) Yang Li, 2020 (unaccepted > superseded combination)
   7. Species Minidiscus chilensis Rivera, 1984 (uncertain > unassessed)
   8. Species Minidiscus decoratus Chrétiennot-Dinet & Quiroga, 2004 (uncertain > unassessed)
   9. Species Minidiscus ocellatus Gao, Cheng & Chin, 1992 (uncertain > unassessed)
   10. Species Minidiscus spinulosus Gao, Cheng & Chin, 1992 (uncertain > unassessed)
   11. Species Minidiscus subtilis Gao, Cheng & Chin, 1992 (uncertain > unassessed)
   12. Species Minidiscus trioculatus (F.J.R.Taylor) Hasle, 1973 accepted as Coscinodiscus trioculatus F.J.R.Taylor, 1966 (uncertain > unassessed)
8. Genus Parthaea S. Gowthaman, 1996
   1. Species Parthaea blanda S.Gowthaman, 1996 accepted as Coscinodiscus blandus A.Schmidt, 1878 (uncertain > unassessed)
9. Genus Planktoniella F. Schütt, 1892
   1. Species Planktoniella blanda (A.Schmidt) E.E.Syvertsen & G.R.Hasle, 1993 (uncertain > unassessed)
   2. Species Planktoniella californica Long, Fuge & Smith, 1946 (uncertain > unassessed)
   3. Species Planktoniella florea Wood, Crosby & Cassie, 1959 (uncertain > unassessed)
   4. Species Planktoniella formosa (Karsten) Qian & Wang, 1996 (uncertain > unassessed)
   5. Species Planktoniella muriformis (Loeblich III, W.W.Wight & W.M.Darley) Round, 1972 accepted as Coenobiodiscus muriformis Loeblich III, W.W.Wight & W.M.Darley, 1968 (uncertain > unassessed)
   6. Species Planktoniella sol (C.G.Wallich) Schütt, 1892 accepted as Coscinodiscus sol C.G.Wallich, 1860 (uncertain > unassessed)
   7. Species Planktoniella woltereckii Schimper ex Karsten, 1905 (uncertain > unassessed)
10. Genus Porosira E. Jorgensen, 1905
    1. Species Porosira antarctica O.G.Kozlova, 1962 (uncertain > unassessed)
    2. Species Porosira antiqua Jousé, 1959 (uncertain > unassessed)
    3. Species Porosira antiqua Jousé, 1961 (uncertain > unassessed)
    4. Species Porosira denticulata Simonsen, 1974 (uncertain > unassessed)
    5. Species Porosira dichotomica O.G.Kozlova, 1962 (uncertain > unassessed)
    6. Species Porosira glacialis (Grunow) Jörgensen, 1905 (uncertain > unassessed)
       1. Variety Porosira glacialis var. antarctica (O.G.Kozlova) T.A.Villareal (uncertain > unassessed)
       2. Variety Porosira glacialis var. glacialis Villareal in Villareal & Fryxell, 1990 (uncertain > unassessed)
    7. Species Porosira maxima Jousé, 1962 (uncertain > unassessed)
    8. Species Porosira pentaportula Syvertsen & Lange, 1990 (uncertain > unassessed)
    9. Species Porosira pliocenica Jousé, 1959 (uncertain > unassessed)
    10. Species Porosira pseudodenticulata (Hustedt) Jousé, 1962 accepted as Coscinodiscus pseudodenticulatus Hustedt, 1958 (uncertain > unassessed)
    11. Species Porosira punctata (Jouse) Makarova, 1988 (uncertain > unassessed)
11. Genus Praestephanos A.Tuji & M.Julius, 2014
12. Genus Roundia Makarova, 1994
    1. Species Roundia cardiophora (Round) Makarova, 1994 accepted as Thalassiosira cardiophora Round, 1988 (uncertain > unassessed)
13. Genus Shionodiscus A.J. Alverson, S.H. Kang & E.C. Theriot, 2006
    1. Species Shionodiscus bioculatus (Grunow) Alverson, Kang & Theriot, 2006
       1. Variety Shionodiscus bioculatus var. exiguus (Grunow) A.J. Alverson, S.H. Kang & E.C. Theriot accepted as Coscinodiscus bioculatus var. exigua Grunow, 1884 (uncertain > unassessed)
    2. Species Shionodiscus gaarderae Ferrario, Almandoz & Cefarelli 2018
    3. Species Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
       1. Variety Shionodiscus oestrupii var. venrickae (G. Fryxell & Hasle) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006
       2. Variety Shionodiscus oestrupii var. planus (Jousé) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira oestrupii var. plana Jousé, 1968 (uncertain > unassessed)
    4. Species Shionodiscus biporus (Shiono) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira bipora M. Shiono, 2000 (uncertain > unassessed)
    5. Species Shionodiscus centrus (Shiono) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira centra M. Shiono, 2000 (uncertain > unassessed)
    6. Species Shionodiscus confusus (Makarova) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira confusa Makarova, 1975 (uncertain > unassessed)
    7. Species Shionodiscus depressus (Shiono) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira depressa M. Shiono, 2000 † (uncertain > unassessed)
    8. Species Shionodiscus endoseriatus (Hasle & G. Fryxell) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira endoseriata Hasle & G.Fryxell, 1977 (uncertain > unassessed)
    9. Species Shionodiscus exceptiunculus (Shiono) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira exceptiuncula Shiono (uncertain > unassessed)
    10. Species Shionodiscus frenguellii (Kozlova) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira frenguellii O.G.Kozlova, 1964 (uncertain > unassessed)
    11. Species Shionodiscus frenguelliopsis (Fryxell & Johansen) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira frenguelliopsis G.A.Fryxell & J.R.Johans, 1985 (uncertain > unassessed)
    12. Species Shionodiscus gracilis (Karsten) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Coscinodiscus gracilis Karsten, 1905 (uncertain > unassessed)
        1. Variety Shionodiscus gracilis var. expectus (VanLandingham) A.J.Alverson; S.H.Kang & E.C.Theriot, 2006 accepted as Thalassiosira expecta VanLandingham, 1978 (uncertain > unassessed)
    13. Species Shionodiscus latimarginatus (Makarova) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira latimarginata Makarova, 1975 (uncertain > unassessed)
    14. Species Shionodiscus perpusillus (O.G.Kozlova) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006 accepted as Thalassiosira perpusilla Kozlova, 1967 (uncertain > unassessed)
    15. Species Shionodiscus poro-irregulatus (Hasle & Heimdal) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira poro-irregulata Hasle & Heimdal, 1970 (uncertain > unassessed)
    16. Species Shionodiscus poroseriatus (Ramsfjell) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Coscinosira poroseriata Ramsfjell, 1959 (uncertain > unassessed)
    17. Species Shionodiscus praeoestrupii (M.P.Dumont, J.G.Baldauf & J.A.Barron) A.J.Alverson, S.-H.Kang & E.C. Theriot, 2006 † accepted as Thalassiosira praeoestrupii M.P.Dumont, J.G.Baldauf & J.A.Barron, 1986 † (uncertain > unassessed)
    18. Species Shionodiscus ritscheri (Hustedt) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Coscinodiscus ritscheri Hustedt, 1958 (uncertain > unassessed)
    19. Species Shionodiscus tetraoestrupii (Bodén) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006 accepted as Thalassiosira tetraoestrupii Bodén, 1993 † (uncertain > unassessed)
        1. Variety Shionodiscus tetraoestrupii var. reimeri (Mahood & Barron) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 † accepted as Thalassiosira tetraoestrupii var. reimeri Mahood & Barron, 1995 † (uncertain > unassessed)
    20. Species Shionodiscus trifultus (G. Fryxell) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira trifulta G.Fryxell, 1979 (uncertain > unassessed)
    21. Species Shionodiscus variantus (Shiono) A.J.Alverson, S.-H.Kang & E.C.Theriot, 2006 † accepted as Thalassiosira variantia M.Shiono, 2001 † (uncertain > unassessed)
    22. Species Shionodiscus voeringensis (Bodén) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Thalassiosira voeringensis Bodén, 1992 (uncertain > unassessed)
14. Genus Sinerima Nesterovich & Caissie, 2018
    1. Species Sinerima marigela Nesterovich & Caissie, 2018
15. Genus Spicaticribra J. Johansen, J.P. Kociolek & R. Lowe, 2008
    1. Species Spicaticribra inlandica (Hayashi) Khursevich & Kociolek, 2012 †
    2. Species Spicaticribra kamszatica (Lupikina) Khursevich & Kociolek, 2012 †
    3. Species Spicaticribra kilarskii (Kaczmarska) Kociolek & Khursevich in Khursevich & Kociolek, 2012 †
    4. Species Spicaticribra kingstonii J.Johansen, P.Kociolek & R.Lowe, 2008
    5. Species Spicaticribra kodaikanaliana B.Karthick & J.P.Kociolek, 2011
    6. Species Spicaticribra nevadica (Khursevich & Van Landingham) Khursevich & Kociolek †
    7. Species Spicaticribra patagonica (Maidana) Kociolek & Khursevich in Khursevich & Kociolek, 2012
    8. Species Spicaticribra rudis (P.Tremarin, T.Ludwig, V.Becker & L.Torgan) A.Tuji, P.Leelahakriengkrai & Y. Peerapornpisal, 2012
    9. Species Spicaticribra tricircularis (Stachura-Suchoples & D. M. Williams) Kociolek & Khursevich in Khursevich & Kociolek, 2012 †
    10. Species Spicaticribra inlandica (Hayashi) Adesalu & Julius accepted as Spicaticribra inlandica (Hayashi) Khursevich & Kociolek, 2012 † (Later Homonym)
16. Genus Stephanocyclus A.P. Skabitschevsky, 1975
    1. Species Stephanocyclus planus A.P. Skabichevskii, 1975 (uncertain > unassessed)
17. Genus Takanoa I.V. Makarova, 1994
    1. Species Takanoa bingensis (Takano) Makarova, 1994 accepted as Thalassiosira bingensis Takano, 1980 (uncertain > unassessed)
18. Genus Thalassiocyclus H. Håkansson & A. Mahood, 1993
    1. Species Thalassiocyclus lucens (Hustedt) Håkansson & Mahood, 1993 accepted as Stephanodiscus lucens Hustedt, 1939 (uncertain > unassessed)
    2. Species Thalassiocyclus pankensis H. Tanaka & T. Nagumo, 2008 (uncertain > unassessed)
19. Genus Thalassiosira P.T. Cleve, 1873 emend. Hasle, 1973
    1. Species Thalassiosira antiqua (Grunow) Cleve
       1. Forma Thalassiosira antiqua f. inermis Sheshukova-Poretskaya, 1959 (uncertain > unassessed)
       2. Forma Thalassiosira antiqua f. lapponica Sheshukova-Poretskaya, 1959 (uncertain > unassessed)
       3. Variety Thalassiosira antiqua var. antiqua (Grunow) Cleve-Euler, 1941 accepted as Coscinodiscus excentricus var. antiquus Grunow, 1884 (uncertain > unassessed)
       4. Variety Thalassiosira antiqua var. septata Proschkina-Lavrenko, 1955 (uncertain > unassessed)
    2. Species Thalassiosira baltica (Grunow) Ostenfeld, 1901
       1. Variety Thalassiosira baltica var. baltica (Grunow in Cleve & Grunow) Ostenfeld, 1901 accepted as Coscinodiscus polyacanthus var. baltica Grunow in Cleve & Grunow, 1880 (uncertain > unassessed)
       2. Variety Thalassiosira baltica var. batava Van Goor, 1920 (uncertain > unassessed)
       3. Variety Thalassiosira baltica var. fluviatilis Cleve-Euler accepted as Thalassiosira subtilis var. fluviatilis Lemmermann, 1904 (uncertain > unassessed)
       4. Variety Thalassiosira baltica var. genuina (Grunow in Cleve & Grunow) Cleve-Euler, 1942 accepted as Coscinodiscus polyacanthus var. baltica Grunow in Cleve & Grunow, 1880 (uncertain > unassessed)
    3. Species Thalassiosira bioculata (Grunow) Ostenfeld, 1903
       1. Variety Thalassiosira bioculata var. bioculata (Grunow) Ostenfeld, 1903 accepted as Coscinodiscus bioculatus var. bioculatus Grunow, 1884 (uncertain > unassessed)
       2. Variety Thalassiosira bioculata var. exigua (Grunow) Hustedt, 1928 accepted as Coscinodiscus bioculatus var. exigua Grunow, 1884 (uncertain > unassessed)
       3. Variety Thalassiosira bioculata var. raripora Gaarder ex Paasche, 1961 (uncertain > unassessed)
    4. Species Thalassiosira catharinensis M. Garcia in M. Garcia & D. Bärwaldt Dutra, 2016
    5. Species Thalassiosira decipiens (Grunow) E.G.Jørgensen, 1905
       1. Forma Thalassiosira decipiens f. levanderi (Van Goor) Takano, 1956 accepted as Thalassiosira levanderi van Goor, 1924 (uncertain > unassessed)
       2. Variety Thalassiosira decipiens var. condensata (Cleve) (uncertain > unassessed)
       3. Variety Thalassiosira decipiens var. decipiens (Grunow) E. Jørgensen, 1905 accepted as Coscinodiscus eccentricus var. decipiens Grunow, 1878 † (uncertain > unassessed)
    6. Species Thalassiosira dolmatovae Oreshkina ex A.Gladenkov, 2013 †
    7. Species Thalassiosira elliptipora J.Fenner ex A.D.Mahood & J.A.Barron
    8. Species Thalassiosira feibelii Brindle & Mohan in Brindle et al., 2018 †
    9. Species Thalassiosira flexuosa (J.Brun) F.Akiba & Y.Yanagisawa
       1. Variety Thalassiosira flexuosa var. tenella Tanimura, 1996 (uncertain > unassessed)
    10. Species Thalassiosira fryxelliae Sunesen & Sar, 2004
    11. Species Thalassiosira gasseae Brindle & Mohan in Brindle et al., 2018 †
    12. Species Thalassiosira gerloffii Rivera, 1981
    13. Species Thalassiosira gravida Cleve, 1896
        1. Forma Thalassiosira gravida f. fossilis Jousé, 1959 (uncertain > unassessed)
        2. Forma Thalassiosira gravida f. fossilis Jousé, 1961 (uncertain > unassessed)
        3. Forma Thalassiosira gravida f. gravida Cleve, 1896 (uncertain > unassessed)
    14. Species Thalassiosira hyalina (Grunow) Gran, 1897
        1. Forma Thalassiosira hyalina f. hyalina (Grunow in Cleve & Grunow) Gran, 1897 accepted as Coscinodiscus hyalinus Grunow, 1880 (uncertain > unassessed)
        2. Forma Thalassiosira hyalina f. kryophiloides Kusjmina, 1960 (uncertain > unassessed)
    15. Species Thalassiosira hyperborea (Grunow) Hasle in Hasle & Lange, 1989
        1. Variety Thalassiosira hyperborea var. hyperborea (Grunow) Hasle in Hasle & Lange, 1989 (uncertain > unassessed)
        2. Variety Thalassiosira hyperborea var. lacunosa G.R.Hasle accepted as Coscinodiscus lacunosus A. Berg, 1952 (uncertain > unassessed)
        3. Variety Thalassiosira hyperborea var. pelagica (Cleve-Euler) Hasle in Hasle & Lange, 1989 accepted as Coscinodiscus lacustris var. pelagica Cleve-Euler, 1937 (uncertain > unassessed)
        4. Variety Thalassiosira hyperborea var. septentrionalis (Grunow) Hasle in Hasle & Lange, 1989 (uncertain > unassessed)
    16. Species Thalassiosira khursevicha Laslandes & Kociolek in Kociolek et al., 2014
    17. Species Thalassiosira laevis Gao & Cheng, 1992
    18. Species Thalassiosira livingstoniorum A.K.S.K.Prasad, P.Hargraves & J.A.Nienow, 2011
    19. Species Thalassiosira minicosmica Lee & Park, 2015
    20. Species Thalassiosira minuscula Krasske, 1941
    21. Species Thalassiosira nitzschioides (Grunow) Mereschkowsky, 1902
    22. Species Thalassiosira nordenskioeldii Cleve, 1873
        1. Forma Thalassiosira nordenskioeldii f. fossilis Jousé, 1959 (uncertain > unassessed)
        2. Forma Thalassiosira nordenskioeldii f. nordenskioeldii Cleve, 1873 (uncertain > unassessed)
    23. Species Thalassiosira oliverana
        1. Variety Thalassiosira oliverana var. sparsa Harwood & Maruyama, 1992 (uncertain > unassessed)
    24. Species Thalassiosira profunda (Hendey) Hasle, 1973
    25. Species Thalassiosira sundarbana B. Samanta & P. Bhadury, 2015
    26. Species Thalassiosira blanda (A.Schmidt) T.V.Desikachary & Gowthaman, 1989 accepted as Planktoniella blanda (A.Schmidt) E.E.Syvertsen & G.R.Hasle, 1993
    27. Species Thalassiosira fluviatilis Hustedt, 1926 accepted as Thalassiosira weissflogii (Grunow) G.Fryxell & Hasle, 1977 (synonym)
        1. Forma Thalassiosira fluviatilis f. fluviatilis Hustedt, 1926 (uncertain > unassessed)
        2. Forma Thalassiosira fluviatilis f. mangrovii Manguin in Bourrelly & Manguin, 1952 (uncertain > unassessed)
    28. Species Thalassiosira hustedtii Poretzky & Anissimova, 1933 accepted as Thalassiosira hendeyi Hasle & G.Fryxell, 1977
        1. Variety Thalassiosira hustedtii var. hustedtii Poretzky & Anissimova, 1933 (uncertain > unassessed)
        2. Variety Thalassiosira hustedtii var. vana Makarova & Proschkina-Lavrenko, 1964 (uncertain > unassessed)
    29. Species Thalassiosira inlandica Hayashi, 2007 † accepted as Spicaticribra inlandica (Hayashi) Adesalu & Julius (Transferred to Spicaticribra)
    30. Species Thalassiosira kilarskii I.Kaczmarska, 1985 † accepted as Spicaticribra kilarskii (Kaczmarska) Kociolek & Khursevich in Khursevich & Kociolek, 2012 † (synonym)
    31. Species Thalassiosira patagonica N. Maidana, 1999 accepted as Spicaticribra patagonica (Maidana) Kociolek & Khursevich in Khursevich & Kociolek, 2012 (synonym)
    32. Species Thalassiosira rotula Meunier, 1910 accepted as Thalassiosira gravida Cleve, 1896 (unaccepted > junior subjective synonym)
    33. Species Thalassiosira rudis P.Tremarin, T.Ludwig, V.Becker & L.Torgan, 2008 accepted as Spicaticribra rudis (P.Tremarin, T.Ludwig, V.Becker & L.Torgan) A.Tuji, P.Leelahakriengkrai & Y. Peerapornpisal, 2012
    34. Species Thalassiosira lacustris (Grunow) Hasle, 1977 represented as Lineaperpetua lacustris (Grunow) Yu, You, Kociolek & Wang 2024 (homotypic synonym)
        1. Variety Thalassiosira lacustris var. cassiospinua Cai & Xie in Xie & Cai, 1981 (uncertain > unassessed)
        2. Variety Thalassiosira lacustris var. hyperborea (Grunow) Qi in Qi, Zhang & Lin, 1980 (uncertain > unassessed)
        3. Variety Thalassiosira lacustris var. nipponica (Skvortzow) Qi in Qi, Zhang & Lin, 1980 (uncertain > unassessed)
        4. Variety Thalassiosira lacustris var. proximus (Makarova) Makarova, 1983 accepted as Coscinodiscus proximus Makarova, 1961 (uncertain > unassessed)
        5. Variety Thalassiosira lacustris var. septentrionalis (Grunow) Qi in Qi, Zhang & Lin, 1980 (uncertain > unassessed)
        6. Variety Thalassiosira lacustris var. septentrionalis (Grunow) Makarova, 1983 (uncertain > unassessed)
        7. Variety Thalassiosira lacustris var. sinica (Skvortzow) Qi in Qi, Zhang & Lin, 1980 accepted as Coscinodiscus sinicus Skvortzow, 1946 (uncertain > unassessed)
    35. Species Thalassiosira oestrupii (Ostenfeld) Hasle, 1972 represented as Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
        1. Variety Thalassiosira oestrupii var. venrickae G.Fryxell & Hasle, 1980 represented as Shionodiscus oestrupii var. venrickae (G. Fryxell & Hasle) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006
        2. Variety Thalassiosira oestrupii var. plana Jousé, 1968 (uncertain > unassessed)
    36. Species Thalassiosira aculeata Proshkina-Lavrenko, 1956 (uncertain > unassessed)
    37. Species Thalassiosira adamsi Mertz, 1966 (uncertain > unassessed)
    38. Species Thalassiosira adeliae Manguin, 1957 (uncertain > unassessed)
    39. Species Thalassiosira aestivalis Gran, 1931 (uncertain > unassessed)
    40. Species Thalassiosira affinis Makarova, 1961 (uncertain > unassessed)
    41. Species Thalassiosira allenii Takano, 1965 (uncertain > unassessed)
    42. Species Thalassiosira ambigua O.G.Kozlova, 1962 (uncertain > unassessed)
    43. Species Thalassiosira andamanica A.D.Gedde, 1999 (uncertain > unassessed)
    44. Species Thalassiosira angstii (Gran) Makarova, 1971 accepted as Coscinodiscus angstii var. angstii Gran in Gran & Angst, 1931 (uncertain > unassessed)
    45. Species Thalassiosira angulata (W.Gregory) Hasle, 1978 accepted as Orthosira angulata Gregory, 1857 (uncertain > unassessed)
    46. Species Thalassiosira anguste-lineata (A.Schmidt) G.Fryxell & Hasle, 1977 accepted as Coscinodiscus angustelineatus Schmidt in Schmidt et al., 1878 (uncertain > unassessed)
    47. Species Thalassiosira annaliae Voltolina, 1971 (uncertain > unassessed)
    48. Species Thalassiosira antarctica Comber, 1896 (uncertain > unassessed)
        1. Variety Thalassiosira antarctica var. borealis G.Fryxell, Doucette & Hubbard, 1981 (uncertain > unassessed)
    49. Species Thalassiosira antarctica Karsten, 1905 (uncertain > unassessed)
    50. Species Thalassiosira atlantica Goryanova, 1958 (uncertain > unassessed)
    51. Species Thalassiosira aurivillii Cleve, 1901 (uncertain > unassessed)
    52. Species Thalassiosira australiensis (Grunow) Hasle in Hasle & Lange, 1989 accepted as Coscinodiscus australiensis Grunow, 1884 (uncertain > unassessed)
    53. Species Thalassiosira australis M.Peragallo, 1921 (uncertain > unassessed)
    54. Species Thalassiosira baldaufii Boden, 1993 (uncertain > unassessed)
    55. Species Thalassiosira binata Fryxell, 1977 (uncertain > unassessed)
        1. Variety Thalassiosira binata var. bibinata Gao & Cheng, 1982 (uncertain > unassessed)
        2. Variety Thalassiosira binata var. minor Gao & Cheng, 1992 (uncertain > unassessed)
    56. Species Thalassiosira bingensis Takano, 1980 (uncertain > unassessed)
    57. Species Thalassiosira bipartita (Rattray) Hallegraeff, 1992 accepted as Coscinodiscus bipartitus Rattray, 1890 (uncertain > unassessed)
    58. Species Thalassiosira bipora M. Shiono, 2000 (uncertain > unassessed)
    59. Species Thalassiosira blandus (A. Schmidt) Desikachary & Gowthaman in Desikachary, 1989 accepted as Coscinodiscus blandus A.Schmidt, 1878 (uncertain > unassessed)
    60. Species Thalassiosira borealis Koizumi, 1980 (uncertain > unassessed)
    61. Species Thalassiosira bramaputrae (Ehrenberg) Håkansson & Locker, 1981 accepted as Stephanodiscus bramaputrae Ehrenberg, 1854 (uncertain > unassessed)
        1. Variety Thalassiosira bramaputrae var. proximus (Makarova) Makarova, 1988 accepted as Coscinodiscus proximus Makarova, 1961 (uncertain > unassessed)
        2. Variety Thalassiosira bramaputrae var. septentrionalis (Grunow) Makarova, 1988 accepted as Coscinodiscus septentrionalis Grunow, 1884 (uncertain > unassessed)
    62. Species Thalassiosira brunii Akiba & Yangisawa, 1985 (uncertain > unassessed)
    63. Species Thalassiosira bukryi Barron, 1983 (uncertain > unassessed)
    64. Species Thalassiosira bulbosa Syvertsen in Syvertsen & Hasle, 1984 (uncertain > unassessed)
    65. Species Thalassiosira bungerensis R.M. Gogorev & Z.V. Pushina in Gogorev et al., 2010 (uncertain > unassessed)
    66. Species Thalassiosira burckliana Schrader, 1974 (uncertain > unassessed)
    67. Species Thalassiosira californica Tanimura, 1996 (uncertain > unassessed)
    68. Species Thalassiosira cardiophora Round, 1988 (uncertain > unassessed)
    69. Species Thalassiosira caspica Makarova, 1959 (uncertain > unassessed)
    70. Species Thalassiosira castanea Akiba & Yanagisawa, 1998 (uncertain > unassessed)
    71. Species Thalassiosira cedarkeyensis A.K.S.K.Prasad, 1993 (uncertain > unassessed)
    72. Species Thalassiosira centra M. Shiono, 2000 (uncertain > unassessed)
    73. Species Thalassiosira chilensis Krasske, 1941 (uncertain > unassessed)
    74. Species Thalassiosira clevei Gran, 1897 (uncertain > unassessed)
    75. Species Thalassiosira complicata Gersonde, 1991 (uncertain > unassessed)
    76. Species Thalassiosira concava Semina, 1991 (uncertain > unassessed)
    77. Species Thalassiosira concaviuscula I.V.Makarova, 1978 (uncertain > unassessed)
    78. Species Thalassiosira condensata Cleve, 1900 (uncertain > unassessed)
    79. Species Thalassiosira conferta Hasle, 1977 (uncertain > unassessed)
    80. Species Thalassiosira confusa Makarova, 1975 (uncertain > unassessed)
    81. Species Thalassiosira congoi Leuduger-Fortmorel, 1898 (uncertain > unassessed)
    82. Species Thalassiosira constricta Gaarder, 1938 accepted as Bacterosira constricta (Gaarder, 1938) J.S. Park & J.H. Lee, 2016 (uncertain > unassessed)
    83. Species Thalassiosira convexa V.V.Muchina, 1965 (uncertain > unassessed)
        1. Variety Thalassiosira convexa var. aspinosa Schrader, 1974 (uncertain > unassessed)
    84. Species Thalassiosira coramandeliana Subrahmanyan, 1946 (uncertain > unassessed)
    85. Species Thalassiosira coromandeliana Subrahmanyan, 1946 (uncertain > unassessed)
    86. Species Thalassiosira coronata Gaarder, 1951 (uncertain > unassessed)
    87. Species Thalassiosira coronata Proschkina-Lavrenko, 1955 (uncertain > unassessed)
    88. Species Thalassiosira coronifera Proschkina-Lavrenko, 1961 (uncertain > unassessed)
    89. Species Thalassiosira cretacea Deflandre, 1941 (uncertain > unassessed)
    90. Species Thalassiosira cryophila Kisselev, 1931 (uncertain > unassessed)
    91. Species Thalassiosira cuitzeonensis I.Israde, K.Serieyssol & F.Gasse, 1998 † (uncertain > unassessed)
    92. Species Thalassiosira curiosa Hajós, 1973 (uncertain > unassessed)
    93. Species Thalassiosira curviseriata Takano, 1981 (uncertain > unassessed)
    94. Species Thalassiosira decorata Cleve-Euler, 1941 (uncertain > unassessed)
    95. Species Thalassiosira decrescens Skabichevskaya, 1984 (uncertain > unassessed)
    96. Species Thalassiosira delicata (Barron) Akiba, 1985 accepted as Thalassiosira nidulus var. delicata Barron, 1980 (uncertain > unassessed)
    97. Species Thalassiosira delicatissima Proschkina-Lavrenko, 1960 (uncertain > unassessed)
        1. Forma Thalassiosira delicatissima f. aculeata Kozyrenko, 1960 (uncertain > unassessed)
        2. Forma Thalassiosira delicatissima f. impalpabilis Kozyrenko, 1960 (uncertain > unassessed)
        3. Variety Thalassiosira delicatissima var. delicatissima Kozyrenko, 1959 (uncertain > unassessed)
    98. Species Thalassiosira delicatula Hustedt, 1958 (uncertain > unassessed)
    99. Species Thalassiosira delicatula Ostenfeld, 1908 (uncertain > unassessed)
    100. Species Thalassiosira densannula Hasle & Fryxell, 1977 (uncertain > unassessed)
    101. Species Thalassiosira depressa M. Shiono, 2000 † (uncertain > unassessed)
    102. Species Thalassiosira dichotomica (O.G.Kozlova) G.A.Fryxell & G.R.Hasle, 1983 accepted as Porosira dichotomica O.G.Kozlova, 1962 (uncertain > unassessed)
    103. Species Thalassiosira diporocyclus Hasle, 1972 (uncertain > unassessed)
    104. Species Thalassiosira dispar (M.Peragallo & J.Héribaud) K.Serieyssol, 1998 † accepted as Coscinodiscus dispar var. dispar M. Peragallo & Héribaud in Héribaud, 1893 (uncertain > unassessed)
    105. Species Thalassiosira distans Pouchet, 1891 (uncertain > unassessed)
    106. Species Thalassiosira dubia Kozlova, 1962 (uncertain > unassessed)
    107. Species Thalassiosira dubia Leuduger-Fortmorel, 1892 (uncertain > unassessed)
    108. Species Thalassiosira dubiosa Schrader in Schrader & Fenner, 1976 (uncertain > unassessed)
    109. Species Thalassiosira duostra C.Pienaar, 1990 (uncertain > unassessed)
    110. Species Thalassiosira eccentrica (Ehrenberg) Cleve, 1904 (uncertain > unassessed)
         1. Variety Thalassiosira eccentrica var. fasciculata (Hustedt) Nizamuddin, 1984 accepted as Coscinodiscus excentricus var. fasciculata Hustedt, 1928 (uncertain > unassessed)
    111. Species Thalassiosira echinata Semina in Semina & Fryxell, 1994 (uncertain > unassessed)
    112. Species Thalassiosira elegans (Brun in Brun & Tempère) Jousé, 1961 accepted as Stephanodiscus elegans Brun in Brun & Tempère, 1889 (uncertain > unassessed)
    113. Species Thalassiosira elliptipora (Donahue) Fenner, 1991 (uncertain > unassessed)
    114. Species Thalassiosira elsayedii Fryxell, 1975 (uncertain > unassessed)
    115. Species Thalassiosira endoseriata Hasle & G.Fryxell, 1977 (uncertain > unassessed)
    116. Species Thalassiosira excentrica Karsten, 1905 (uncertain > unassessed)
         1. Forma Thalassiosira excentrica f. excentrica Cleve, 1903 (1904) (uncertain > unassessed)
         2. Forma Thalassiosira excentrica f. major Jousé, 1959 (uncertain > unassessed)
         3. Forma Thalassiosira excentrica f. velata Cleve-Euler, 1942 (uncertain > unassessed)
         4. Variety Thalassiosira excentrica var. fasciculata Chernov, 1947 (uncertain > unassessed)
    117. Species Thalassiosira exceptiuncula Shiono (uncertain > unassessed)
    118. Species Thalassiosira exigua G.Fryxell & Hasle, 1977 (uncertain > unassessed)
    119. Species Thalassiosira expecta VanLandingham, 1978 (uncertain > unassessed)
    120. Species Thalassiosira fallax Meunier, 1910 (uncertain > unassessed)
    121. Species Thalassiosira fallax Kozlova, 1962 (uncertain > unassessed)
    122. Species Thalassiosira fasciculata Harwood & Maruyama, 1992 (uncertain > unassessed)
    123. Species Thalassiosira faurii (Gasse) Hasle, 1978 accepted as Coscinodiscus faurii Gasse, 1975 (uncertain > unassessed)
    124. Species Thalassiosira favosa Makarova in Makarova & Sukhanova, 1998 (uncertain > unassessed)
    125. Species Thalassiosira ferelineata Hasle & G.A.Fryxell, 1977 (uncertain > unassessed)
    126. Species Thalassiosira flexosa (Brun) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus flexuosus var. flexuosus Brun, 1895 (uncertain > unassessed)
    127. Species Thalassiosira floridana (I.C.G.Cooper) Hasle, 1972 accepted as Coscinosira floridana I.C.G.Cooper, 1958 (uncertain > unassessed)
    128. Species Thalassiosira fraga Schrader in Schrader & Fenner, 1976 (uncertain > unassessed)
    129. Species Thalassiosira fragilis G. Fryxell in Fryxell, Gould & Watkins, 1984 (uncertain > unassessed)
    130. Species Thalassiosira frenguelli Kozlova, 1964 (uncertain > unassessed)
    131. Species Thalassiosira frenguellii O.G.Kozlova, 1964 (uncertain > unassessed)
    132. Species Thalassiosira frenguelliopsis G.A.Fryxell & J.R.Johans, 1985 (uncertain > unassessed)
    133. Species Thalassiosira frigida Cleve-Euler, 1917 (uncertain > unassessed)
    134. Species Thalassiosira frigida Cleve-Euler, 1942 (uncertain > unassessed)
    135. Species Thalassiosira gelatinosa Hensen, 1887 (uncertain > unassessed)
    136. Species Thalassiosira gelatinosus Lemmermann, 1899 (uncertain > unassessed)
    137. Species Thalassiosira gersondei Barron in Baldauf & Barron, 1991 (uncertain > unassessed)
    138. Species Thalassiosira gessneri Hustedt, 1956 (uncertain > unassessed)
    139. Species Thalassiosira gracilis (Karsten) Hustedt, 1958 accepted as Coscinodiscus gracilis Karsten, 1905 (uncertain > unassessed)
         1. Variety Thalassiosira gracilis var. gracilis
         2. Variety Thalassiosira gracilis var. expecta (VanLandingham) G.Fryxell & Hasle, 1979 (uncertain > unassessed)
    140. Species Thalassiosira grunowii Akiba & Yanagisawa, 1985 (uncertain > unassessed)
    141. Species Thalassiosira guillardii Hasle, 1978 (uncertain > unassessed)
    142. Species Thalassiosira hasleae Cassie & Dempsey, 1980 (uncertain > unassessed)
    143. Species Thalassiosira haynaldiella Jousé, 1961 (uncertain > unassessed)
    144. Species Thalassiosira hendeyi Hasle & G.Fryxell, 1977 (uncertain > unassessed)
    145. Species Thalassiosira heteromera Makarova, 1975 (uncertain > unassessed)
    146. Species Thalassiosira hibernalis Gayoso, 1989 (uncertain > unassessed)
    147. Species Thalassiosira hispanica Paulsen, 1930 (1931) (uncertain > unassessed)
    148. Species Thalassiosira hispida Syvertsen, 1986 (uncertain > unassessed)
    149. Species Thalassiosira hyalinopsis Barron, 1975 (uncertain > unassessed)
    150. Species Thalassiosira hydra Gombos in Gombos & Ciesielski, 1983 (uncertain > unassessed)
    151. Species Thalassiosira ignota Makarova, 1975 (uncertain > unassessed)
    152. Species Thalassiosira incerta Makarova, 1961 (uncertain > unassessed)
    153. Species Thalassiosira indefinita Jousé, 1959 (uncertain > unassessed)
    154. Species Thalassiosira indica Kazarina, 1978 (uncertain > unassessed)
    155. Species Thalassiosira insigna (Jousé) Harwood & Maruyama, 1992 accepted as Actinocyclus complanatus var. complanatus Castracane, 1886 (uncertain > unassessed)
    156. Species Thalassiosira intermedia Makarova, 1988 (uncertain > unassessed)
    157. Species Thalassiosira intrannula Herzig & Fryxell, 1986 (uncertain > unassessed)
    158. Species Thalassiosira inura Gersonde, 1991 (uncertain > unassessed)
    159. Species Thalassiosira irregulata Schrader in Schrader & Fenner, 1976 (uncertain > unassessed)
    160. Species Thalassiosira jacksonii Koizumi & Barron in Koizumi, 1980 (uncertain > unassessed)
    161. Species Thalassiosira japonica Kisselev, 1935 (uncertain > unassessed)
    162. Species Thalassiosira jouseae Akiba, 1985 (uncertain > unassessed)
    163. Species Thalassiosira kanayae Tanimura, 1996 (uncertain > unassessed)
    164. Species Thalassiosira karenae Semina, 1981 (uncertain > unassessed)
    165. Species Thalassiosira kolbei (Jousé) Gersonde, 1990 accepted as Coscinodiscus kolbei A.P.Jousé, 1965 (uncertain > unassessed)
    166. Species Thalassiosira kozlovii Makarova, 1971 (uncertain > unassessed)
    167. Species Thalassiosira kryophila (Grunow) E.Jørgensen, 1905 accepted as Coscinodiscus kryophilus Grunow, 1884 (uncertain > unassessed)
    168. Species Thalassiosira kushirensis Takano, 1985 (uncertain > unassessed)
    169. Species Thalassiosira labimarginata Bodén, 1993 (uncertain > unassessed)
    170. Species Thalassiosira latimarginata Makarova, 1975 (uncertain > unassessed)
    171. Species Thalassiosira lentiginosa (Janisch) Fryxell, 1977 accepted as Coscinodiscus lentiginosus var. lentiginosus Janisch in Schmidt et al., 1878 (uncertain > unassessed)
    172. Species Thalassiosira leptopus (Grunow ex Van Heurck) Hasle & G.Fryxell, 1977 (uncertain > unassessed)
         1. Variety Thalassiosira leptopus var. elliptica (Kolbe) Barron, 1980 accepted as Coscinodiscus lineatus var. ellipticus Kolbe, 1954 (uncertain > unassessed)
    173. Species Thalassiosira levanderi van Goor, 1924 (uncertain > unassessed)
    174. Species Thalassiosira licea G.Fryxell, 1978 (uncertain > unassessed)
    175. Species Thalassiosira lindstroemii Boden, 1992 (uncertain > unassessed)
    176. Species Thalassiosira lineata Jousé, 1968 (uncertain > unassessed)
    177. Species Thalassiosira lineoides Herzig & Fryxell, 1986 (uncertain > unassessed)
    178. Species Thalassiosira longifultoportulata R.M.Gogorev & Z.V.Pushina, 2010 † (uncertain > unassessed)
    179. Species Thalassiosira longissima Cleve, 1906-1908 (uncertain > unassessed)
    180. Species Thalassiosira lundiana Fryxell, 1975 (uncertain > unassessed)
    181. Species Thalassiosira lusca Schrader in Schrader & Fenner, 1976 (uncertain > unassessed)
    182. Species Thalassiosira maculata G.A.Fryxell & J.R.Johansen, 1985 (uncertain > unassessed)
    183. Species Thalassiosira maeotica Proschkina-Lavrenko, 1960 (uncertain > unassessed)
    184. Species Thalassiosira mahoodii Barron in Baldauf & Barron, 1991 (uncertain > unassessed)
    185. Species Thalassiosira makarovae Mukhina, 1978 (uncertain > unassessed)
    186. Species Thalassiosira mala Takano, 1965 (uncertain > unassessed)
    187. Species Thalassiosira manifesta Sheshukova-Poretzkaja, 1964 (uncertain > unassessed)
    188. Species Thalassiosira manifesta Sheshukova-Poretskaya, 1961 (uncertain > unassessed)
    189. Species Thalassiosira manifesta Sheshukova-Poretzky emend Makarova in Gleser, Makarova, Moiseeva & Nikolaev, 1988 (uncertain > unassessed)
    190. Species Thalassiosira margaritae (Frenguelli & Orlando) O.G.Kozlova, 1962 accepted as Coscinodiscus margaritae Frenguelli & Orlando, 1958 (uncertain > unassessed)
    191. Species Thalassiosira marginata Venkataraman, 1939 (uncertain > unassessed)
    192. Species Thalassiosira marujamica Sheshukova-Poretzkaya, 1959 (uncertain > unassessed)
    193. Species Thalassiosira marujamica Sheshukova-Poretzky emend Makarova in Gleser, Makarova, Moiseeva & Nikolaev, 1988 (uncertain > unassessed)
    194. Species Thalassiosira mediaconvexa Schrader in Schrader & Fenner, 1976 (uncertain > unassessed)
    195. Species Thalassiosira mediterranea (Schröder) Hasle, 1972 accepted as Coscinosira mediterranea Schröder, 1911 (uncertain > unassessed)
    196. Species Thalassiosira mendiolana Hasle & Heimdal, 1970 (uncertain > unassessed)
    197. Species Thalassiosira minima Gaarder, 1951 (uncertain > unassessed)
    198. Species Thalassiosira minima Mertz, 1966 (uncertain > unassessed)
    199. Species Thalassiosira minutissima Oreshkina in Barron & Gladenkov, 1995 (uncertain > unassessed)
    200. Species Thalassiosira miocenica Schrader, 1974 (uncertain > unassessed)
    201. Species Thalassiosira mioplicata Akiba & Yanagisawa, 1985 (uncertain > unassessed)
    202. Species Thalassiosira mirniae Jousé, 1962 (uncertain > unassessed)
    203. Species Thalassiosira mirnyi Jousé, 1965 (uncertain > unassessed)
    204. Species Thalassiosira mizunamiensis Yanagisawa, 1993 (uncertain > unassessed)
    205. Species Thalassiosira moholensis (Schrader) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus moholensis Schrader, 1974 (uncertain > unassessed)
    206. Species Thalassiosira monile Cleve, 1900 (1901) (uncertain > unassessed)
    207. Species Thalassiosira monoporocyclus Hasle, 1972 (uncertain > unassessed)
    208. Species Thalassiosira multipora Whiting & Schrader, 1985 (uncertain > unassessed)
    209. Species Thalassiosira nana Lohmann, 1908 (uncertain > unassessed)
    210. Species Thalassiosira nanolineata (A.Mann) Fryxell & Hasle, 1977 accepted as Coscinodiscus nanolineatus Mann, 1925 (uncertain > unassessed)
    211. Species Thalassiosira nansenii Scherer & Koc, 1996 (uncertain > unassessed)
    212. Species Thalassiosira nativa Sheshukova-Poretskaya, 1964 (uncertain > unassessed)
    213. Species Thalassiosira nevadica Khursevich & Van Landingham, 1993 (uncertain > unassessed)
    214. Species Thalassiosira nidulus (Tempère & Brun in Brun & Tempère) Jousé, 1961 accepted as Stephanopyxis nidulus Tempère & Brun in Brun & Tempère, 1889 (uncertain > unassessed)
         1. Variety Thalassiosira nidulus var. delicata Barron, 1980 (uncertain > unassessed)
    215. Species Thalassiosira nitzschioides Derjugin K.M., 1915 (uncertain > unassessed)
    216. Species Thalassiosira nodulolineata (Hendey) Hasle & Fryxell, 1977 accepted as Coscinodiscus nodulolineatus Hendey, 1958 (uncertain > unassessed)
    217. Species Thalassiosira nordenskioldii Cleve emend Berg, 1952 (uncertain > unassessed)
    218. Species Thalassiosira obica Kozlova, 1967 (uncertain > unassessed)
    219. Species Thalassiosira oceanica Hasle, 1983 (uncertain > unassessed)
    220. Species Thalassiosira oliveriana (O'Meara) I.V.Makarova & V.A.Nikolajev, 1983 (uncertain > unassessed)
    221. Species Thalassiosira opposita Koizumi, 1980 (uncertain > unassessed)
    222. Species Thalassiosira oranica Hasle, 1985 (uncertain > unassessed)
    223. Species Thalassiosira ordinaria Makar, 1977 (uncertain > unassessed)
    224. Species Thalassiosira orientalis Sheshukova-Porezkaya, 1959 (uncertain > unassessed)
    225. Species Thalassiosira orientalis Sheshukova-Poretzky emend Makarova in Gleser, Makarova, Moiseeva & Nikolaev, 1988 (uncertain > unassessed)
    226. Species Thalassiosira ornata Proshkina-Lavrenko, 1959 (uncertain > unassessed)
    227. Species Thalassiosira ostenfeldii Cleve-Euler, 1951 (uncertain > unassessed)
    228. Species Thalassiosira pacifica Gran & Angst, 1931 (uncertain > unassessed)
    229. Species Thalassiosira partheneia Schrader, 1972 (uncertain > unassessed)
    230. Species Thalassiosira parva Proschkina-Lavrenko, 1955 (uncertain > unassessed)
    231. Species Thalassiosira parvula Makarova, 1977 (uncertain > unassessed)
    232. Species Thalassiosira perispinosa Tanimura, 1996 (uncertain > unassessed)
    233. Species Thalassiosira perpusilla Kozlova, 1967 (uncertain > unassessed)
    234. Species Thalassiosira planiuscula (Rattray) D.M. Harwood & T. Maruyama, 1992 accepted as Coscinodiscus planiusculus Rattray, 1890 (uncertain > unassessed)
    235. Species Thalassiosira plicata Schrader, 1974 (uncertain > unassessed)
    236. Species Thalassiosira plicatoides (Simonsen) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus plicatoides Simonsen, 1974 (uncertain > unassessed)
    237. Species Thalassiosira polychorda (Gran) E.Jorgensen, 1899 accepted as Coscinodiscus polychordus Gran, 1897 (uncertain > unassessed)
    238. Species Thalassiosira poro-irregulata Hasle & Heimdal, 1970 (uncertain > unassessed)
    239. Species Thalassiosira poroseriata (Ramsfjell) Hasle, 1972 accepted as Coscinosira poroseriata Ramsfjell, 1959 (uncertain > unassessed)
    240. Species Thalassiosira porosiroides Makarova, 1991 (uncertain > unassessed)
    241. Species Thalassiosira praeconvexa Burckle, 1972 (uncertain > unassessed)
    242. Species Thalassiosira praeconvexa Burckle emend Gersonde & Schrader, 1984 (uncertain > unassessed)
    243. Species Thalassiosira praefraga Gladenkov & Barron, 1995 † (uncertain > unassessed)
    244. Species Thalassiosira praekryophila Oreshkina in Oreshkina & Vitukhin, 1987 (uncertain > unassessed)
    245. Species Thalassiosira praenidulus Akiba, 1985 (uncertain > unassessed)
    246. Species Thalassiosira praeoestrupii M.P.Dumont, J.G.Baldauf & J.A.Barron, 1986 † (uncertain > unassessed)
    247. Species Thalassiosira praeyabei (Schrader) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus praeyabei Schrader, 1973 (uncertain > unassessed)
    248. Species Thalassiosira primalabiata Gombos in Gombos & Ciesielski, 1983 (uncertain > unassessed)
    249. Species Thalassiosira proschkinae Makarova, 1979 (uncertain > unassessed)
         1. Variety Thalassiosira proschkinae var. spinulata (Takano) Makarova, 1988 accepted as Thalassiosira spinulata Takano, 1981 (uncertain > unassessed)
    250. Species Thalassiosira pseudomultipora Makarova, 1990 (uncertain > unassessed)
    251. Species Thalassiosira pseudonana Hasle & Heimdal, 1970 (uncertain > unassessed)
    252. Species Thalassiosira pulchella Takano, 1963 (uncertain > unassessed)
    253. Species Thalassiosira punctata Jousé, 1959 (uncertain > unassessed)
    254. Species Thalassiosira punctata Jousé, 1961 (uncertain > unassessed)
    255. Species Thalassiosira punctatus Venkataraman, 1941 (uncertain > unassessed)
    256. Species Thalassiosira punctifera (Grunow) Fryxell, Simonsen & Hasle, 1974 accepted as Coscinodiscus excentricus var. punctifera Grunow, 1884 (uncertain > unassessed)
    257. Species Thalassiosira punctigera (Castracane) Hasle, 1983 accepted as Ethmodiscus punctiger Castracane, 1886 (uncertain > unassessed)
    258. Species Thalassiosira regulata Kazarina, 1978 (uncertain > unassessed)
    259. Species Thalassiosira ritscheri (Hustedt) Hasle, 1970 accepted as Coscinodiscus ritscheri Hustedt, 1958 (uncertain > unassessed)
    260. Species Thalassiosira rosulata Takano, 1985 (uncertain > unassessed)
    261. Species Thalassiosira rudolfii (Bachmann) Hasle, 1978 accepted as Coscinodiscus rudolfi Bachmann, 1938 (uncertain > unassessed)
    262. Species Thalassiosira sackettii G. Fryxell, 1977 (uncertain > unassessed)
         1. Forma Thalassiosira sackettii f. plana G. Fryxell, 1977 (uncertain > unassessed)
    263. Species Thalassiosira salvadoriana Hustedt, 1956 (uncertain > unassessed)
    264. Species Thalassiosira sancettae Akiba, 1985 (uncertain > unassessed)
    265. Species Thalassiosira sarmatica Hajós, 1973 (uncertain > unassessed)
    266. Species Thalassiosira saturni Lohmann, 1908 (uncertain > unassessed)
    267. Species Thalassiosira scotia Fryxell & Hoban, 1979 (uncertain > unassessed)
    268. Species Thalassiosira sheshukovae Makarova, 1988 (uncertain > unassessed)
    269. Species Thalassiosira simonsenii Hasle & G.Fryxell, 1977 (uncertain > unassessed)
         1. Variety Thalassiosira simonsenii var. minor Hemphill-Haley in Hemphill-Haley & Fourtanier, 1995 (uncertain > unassessed)
    270. Species Thalassiosira simplex Hustedt, 1956 (uncertain > unassessed)
    271. Species Thalassiosira singularis Sheshukova-Poretskaya, 1967 (uncertain > unassessed)
    272. Species Thalassiosira solitaria Gayoso, 1985 (uncertain > unassessed)
    273. Species Thalassiosira spicula Kozlova, 1967 (uncertain > unassessed)
    274. Species Thalassiosira spinoconvexa Akiba & Yanagisawa, 1998 (uncertain > unassessed)
    275. Species Thalassiosira spinosa H.J.Schrader, 1976 (uncertain > unassessed)
         1. Variety Thalassiosira spinosa var. aspinosa Schradre, 1976 (uncertain > unassessed)
    276. Species Thalassiosira spinosa Simonsen, 1974 (uncertain > unassessed)
    277. Species Thalassiosira spinulata Takano, 1981 (uncertain > unassessed)
    278. Species Thalassiosira spumellaroides Schrader, 1976 (uncertain > unassessed)
    279. Species Thalassiosira stellaris Hasle & Guillard, 1977 (uncertain > unassessed)
    280. Species Thalassiosira strelnikoviae Makarova, 1976 (uncertain > unassessed)
    281. Species Thalassiosira striata Harwood & Maruyama, 1992 (uncertain > unassessed)
    282. Species Thalassiosira subsalina Proshkina-Lavrenko, 1955 (uncertain > unassessed)
    283. Species Thalassiosira subtilis (Ostenfeld) Gran, 1900 (uncertain > unassessed)
         1. Variety Thalassiosira subtilis var. fluviatilis Lemmermann, 1904 (uncertain > unassessed)
         2. Variety Thalassiosira subtilis var. maxima Ferrario, 1988 (uncertain > unassessed)
         3. Variety Thalassiosira subtilis var. subtilis (Ostenfeld) Gran, 1900 accepted as Podosira subtilis Ostenfeld, 1899 (uncertain > unassessed)
    284. Species Thalassiosira symbolophora Schrader, 1974 (uncertain > unassessed)
    285. Species Thalassiosira symmetrica G.A.Fryxell & Hasle, 1973 (uncertain > unassessed)
    286. Species Thalassiosira tappanae Barron, 1985 (uncertain > unassessed)
    287. Species Thalassiosira tcherniai Manguin, 1957 (uncertain > unassessed)
    288. Species Thalassiosira tealata Takano, 1980 (uncertain > unassessed)
    289. Species Thalassiosira temperei (Brun) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus temperei Brun in Brun & Tempère, 1889 (uncertain > unassessed)
    290. Species Thalassiosira tenera Proschkina-Lavrenko, 1961 (uncertain > unassessed)
    291. Species Thalassiosira tertiaria Sheshukova-Poretskaya, 1967 (uncertain > unassessed)
    292. Species Thalassiosira tetraoestrupii Bodén, 1993 † (uncertain > unassessed)
         1. Variety Thalassiosira tetraoestrupii var. reimeri Mahood & Barron, 1995 † (uncertain > unassessed)
    293. Species Thalassiosira thailandica Boonyapiwat in Boonyapiwat & Takano, 1986 (uncertain > unassessed)
    294. Species Thalassiosira torokina Brady, 1977 (uncertain > unassessed)
    295. Species Thalassiosira transitoria Tanimura, 1996 (uncertain > unassessed)
    296. Species Thalassiosira trifulta G.Fryxell, 1979 (uncertain > unassessed)
    297. Species Thalassiosira tropica Misra, 1956 (uncertain > unassessed)
    298. Species Thalassiosira tubifera Fryxell, 1975 (uncertain > unassessed)
    299. Species Thalassiosira tumida (Janisch) Hasle, 1971 accepted as Coscinodiscus tumidus var. tumidus Janisch in Schmidt et al., 1878 (uncertain > unassessed)
    300. Species Thalassiosira ulna Kozlova, 1967 (uncertain > unassessed)
    301. Species Thalassiosira umaoiensis Akiba, 1985 (uncertain > unassessed)
    302. Species Thalassiosira undulosa (Mann) Sheshukova-Poretskaya, 1967 accepted as Coscinodiscus undulosus var. undulosus Mann, 1907 (uncertain > unassessed)
    303. Species Thalassiosira urahoroensis Akiba, 1985 (uncertain > unassessed)
    304. Species Thalassiosira usachevii Jousé, 1959 (uncertain > unassessed)
    305. Species Thalassiosira usatschevii Jousé, 1961 (uncertain > unassessed)
    306. Species Thalassiosira variabilis (uncertain > unassessed)
         1. Variety Thalassiosira variabilis var. fasciculata Proschkina-Lavrenko, 1961 (uncertain > unassessed)
         2. Variety Thalassiosira variabilis var. variabilis Makarova, 1959 (uncertain > unassessed)
    307. Species Thalassiosira variantia M.Shiono, 2001 † (uncertain > unassessed)
    308. Species Thalassiosira visurgis Hustedt, 1957 (uncertain > unassessed)
    309. Species Thalassiosira voeringensis Bodén, 1992 (uncertain > unassessed)
    310. Species Thalassiosira vulnifica (Gombos) Fenner amend Mahood & Barron, 1996 accepted as Coscinodiscus vulnificus Gombos, 1976 (uncertain > unassessed)
    311. Species Thalassiosira webbi Harwood & Maruyama, 1992 (uncertain > unassessed)
    312. Species Thalassiosira weissflogii (Grunow) G.Fryxell & Hasle, 1977 accepted as Micropodiscus weissflogii Grunow, 1885 (uncertain > unassessed)
    313. Species Thalassiosira willei Henckel, 1925 (uncertain > unassessed)
    314. Species Thalassiosira wongii Mahood in Mahood, Fryxell & McMillan, 1986 (uncertain > unassessed)
    315. Species Thalassiosira yabei (Kanaya) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus yabei Kanaya, 1959 (uncertain > unassessed)
    316. Species Thalassiosira zabelinae Jousé, 1959 accepted as Eupyxidicula zabelinae (Jousé) S.Blanco & C.E.Wetzel, 2016 (uncertain > unassessed)

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