Coscinosira oestrupii Ostenfeld, 1900 represented as Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
Coscinosira poroseriata Ramsfjell, 1959 (uncertain > unassessed )
Planktoniella sol (C.G.Wallich) Schütt, 1892 accepted as Coscinodiscus sol C.G.Wallich, 1860
Porosira dichotomica O.G.Kozlova, 1962 (uncertain > unassessed )
Porosira glacialis (Grunow) Jörgensen, 1905 (uncertain > unassessed )
Porosira pseudodenticulata (Hustedt) Jousé, 1962 accepted as Coscinodiscus pseudodenticulatus Hustedt, 1958
Shionodiscus gracilis (Karsten) A.J. Alverson, S.H. Kang & E.C. Theriot, 2006 accepted as Coscinodiscus gracilis Karsten, 1905
Shionodiscus gracilis var. expectus (VanLandingham) A.J.Alverson; S.H.Kang & E.C.Theriot, 2006 accepted as Thalassiosira expecta VanLandingham, 1978
Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
Shionodiscus perpusillus (O.G.Kozlova) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006 accepted as Thalassiosira perpusilla Kozlova, 1967
Thalassiosira ambigua O.G.Kozlova, 1962 (uncertain > unassessed )
Thalassiosira antarctica Comber, 1896 (uncertain > unassessed )
Thalassiosira australis M.Peragallo, 1921 (uncertain > unassessed )
Thalassiosira baltica (Grunow) Ostenfeld, 1901
Thalassiosira complicata Gersonde, 1991 (uncertain > unassessed )
Thalassiosira decipiens (Grunow) E.G.Jørgensen, 1905
Thalassiosira dichotomica (O.G.Kozlova) G.A.Fryxell & G.R.Hasle, 1983 accepted as Porosira dichotomica O.G.Kozlova, 1962
Thalassiosira eccentrica (Ehrenberg) Cleve, 1904 (uncertain > unassessed )
Thalassiosira elliptipora (Donahue) Fenner, 1991 (uncertain > unassessed )
Thalassiosira expecta VanLandingham, 1978 (uncertain > unassessed )
Thalassiosira ferelineata Hasle & G.A.Fryxell, 1977 (uncertain > unassessed )
Thalassiosira frenguelli Kozlova, 1964 (uncertain > unassessed )
Thalassiosira frenguellii O.G.Kozlova, 1964 (uncertain > unassessed )
Thalassiosira frenguelliopsis G.A.Fryxell & J.R.Johans, 1985 (uncertain > unassessed )
Thalassiosira gerloffii Rivera, 1981
Thalassiosira gracilis (Karsten) Hustedt, 1958 accepted as Coscinodiscus gracilis Karsten, 1905
Thalassiosira gracilis var. expecta (VanLandingham) G.Fryxell & Hasle, 1979 (uncertain > unassessed )
Thalassiosira gracilis var. gracilis
Thalassiosira gravida Cleve, 1896
Thalassiosira insigna (Jousé) Harwood & Maruyama, 1992 accepted as Actinocyclus complanatus var. complanatus Castracane, 1886
Thalassiosira inura Gersonde, 1991 (uncertain > unassessed )
Thalassiosira lentiginosa (Janisch) Fryxell, 1977 accepted as Coscinodiscus lentiginosus var. lentiginosus Janisch in Schmidt et al., 1878
Thalassiosira leptopus (Grunow ex Van Heurck) Hasle & G.Fryxell, 1977 (uncertain > unassessed )
Thalassiosira lineata Jousé, 1968 (uncertain > unassessed )
Thalassiosira maculata G.A.Fryxell & J.R.Johansen, 1985 (uncertain > unassessed )
Thalassiosira margaritae (Frenguelli & Orlando) O.G.Kozlova, 1962 accepted as Coscinodiscus margaritae Frenguelli & Orlando, 1958
Thalassiosira oestrupii (Ostenfeld) Hasle, 1972 represented as Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
Thalassiosira oliverana
Thalassiosira oliveriana (O'Meara) I.V.Makarova & V.A.Nikolajev, 1983 (uncertain > unassessed )
Thalassiosira partheneia Schrader, 1972 (uncertain > unassessed )
Thalassiosira perpusilla Kozlova, 1967 (uncertain > unassessed )
Thalassiosira poro-irregulata Hasle & Heimdal, 1970 (uncertain > unassessed )
Thalassiosira poroseriata (Ramsfjell) Hasle, 1972 accepted as Coscinosira poroseriata Ramsfjell, 1959
Thalassiosira ritscheri (Hustedt) Hasle, 1970 accepted as Coscinodiscus ritscheri Hustedt, 1958
Thalassiosira scotia Fryxell & Hoban, 1979 (uncertain > unassessed )
Thalassiosira striata Harwood & Maruyama, 1992 (uncertain > unassessed )
Thalassiosira symmetrica G.A.Fryxell & Hasle, 1973 (uncertain > unassessed )
Thalassiosira torokina Brady, 1977 (uncertain > unassessed )
Thalassiosira trifulta G.Fryxell, 1979 (uncertain > unassessed )
Thalassiosira tumida (Janisch) Hasle, 1971 accepted as Coscinodiscus tumidus var. tumidus Janisch in Schmidt et al., 1878
Thalassiosira vulnifica (Gombos) Fenner amend Mahood & Barron, 1996 accepted as Coscinodiscus vulnificus Gombos, 1976
Thalassiosira webbi Harwood & Maruyama, 1992 (uncertain > unassessed )