1. Species Thalassionema bacillare (Heiden) Kolbe, 1955
2. Species Thalassionema bifurcum Kato & Suto, 2019 †
3. Species Thalassionema frauenfeldii (Grunow) Tempère & Peragallo, 1910
4. Species Thalassionema kuroshioensis Sugie & Ko.Suzuki, 2015
5. Species Thalassionema nitzschioides (Grunow) Mereschkowsky, 1902
6. Species Thalassionema antiqua Schrader, 1973 (uncertain > unassessed)
7. Species Thalassionema bacillaris (Heiden & Kolbe) Kolbe, 1955 accepted as Spinigera bacillaris Heiden, 1928 (uncertain > unassessed)
8. Species Thalassionema capitulata (Castracane) Hustedt, 1958 accepted as Synedra capitulata Castracane, 1886 (uncertain > unassessed)
9. Species Thalassionema claviformis Schrader, 1973 (uncertain > unassessed)
10. Species Thalassionema curvatum Kisselev, 1935 (uncertain > unassessed)
11. Species Thalassionema elegans Hustedt, 1958 (uncertain > unassessed)
12. Species Thalassionema gelida (uncertain > unassessed)
13. Species Thalassionema hirosakiensis (Kanaya) Schrader, 1973 accepted as Fragilaria hirosakiensis Kanaya, 1959 (uncertain > unassessed)
14. Species Thalassionema javanicum (Grunow) Hasle in Hasle & Syvertsen, 1996 accepted as Thalassiothrix frauenfeldii var. javanica Grunow, 1881 (uncertain > unassessed)
15. Species Thalassionema lineatum Jousé, 1971 (uncertain > unassessed)
16. Species Thalassionema obtusa (Grunow) Andrews, 1976 accepted as Thalassiothrix nitzschioides var. obtusa Grunow in Van Heurck, 1881 (uncertain > unassessed)
17. Species Thalassionema pseudonitzschioides (Schuette & Schrader) Hasle in Hasle & Syvertsen, 1996 accepted as Thalassiothrix pseudonitzschioides G.Schuette & H.Schrader, 1982 (uncertain > unassessed)
18. Species Thalassionema robusta Schrader, 1973 (uncertain > unassessed)
19. Species Thalassionema schraderi Akiba, 1982 (uncertain > unassessed)
20. Species Thalassionema synedriforme (Greville) Hasle, 1999 (uncertain > unassessed)

 The webpage text is licensed under a Creative Commons Attribution 4.0 License