Coscinosira oestrupii Ostenfeld, 1900 represented as Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
Porosira glacialis (Grunow) Jörgensen, 1905 (uncertain > unassessed )
Porosira pseudodenticulata (Hustedt) Jousé, 1962 accepted as Coscinodiscus pseudodenticulatus Hustedt, 1958
Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
Thalassiosira antarctica Comber, 1896 (uncertain > unassessed )
Thalassiosira eccentrica (Ehrenberg) Cleve, 1904 (uncertain > unassessed )
Thalassiosira fallax Meunier, 1910 (uncertain > unassessed )
Thalassiosira gracilis (Karsten) Hustedt, 1958 accepted as Coscinodiscus gracilis Karsten, 1905
Thalassiosira gravida Cleve, 1896
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 oestrupii (Ostenfeld) Hasle, 1972 represented as Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
Thalassiosira trifulta G.Fryxell, 1979 (uncertain > unassessed )
Thalassiosira tumida (Janisch) Hasle, 1971 accepted as Coscinodiscus tumidus var. tumidus Janisch in Schmidt et al., 1878