Lioloma delicatulum (Cupp) Hasle, 1996
Thalassionema bacillare (Heiden) Kolbe, 1955
Thalassionema frauenfeldii (Grunow) Tempère & Peragallo, 1910
Thalassionema nitzschioides (Grunow) Mereschkowsky, 1902
Thalassionema pseudonitzschioides (Schuette & Schrader) Hasle in Hasle & Syvertsen, 1996 accepted as Thalassiothrix pseudonitzschioides G.Schuette & H.Schrader, 1982
Thalassiothrix delicatula Cupp, 1943 represented as Lioloma delicatulum (Cupp) Hasle, 1996
Thalassiothrix frauenfeldii (Grunow) Grunow, 1880 accepted as Thalassionema frauenfeldii (Grunow) Tempère & Peragallo, 1910
Thalassiothrix longissima Cleve & Grunow, 1880 (uncertain > unassessed )
Thalassiothrix nitzschioides (Grunow) Grunow, 1881 accepted as Thalassionema nitzschioides (Grunow) Mereschkowsky, 1902
Thalassiothrix pseudonitzschioides G.Schuette & H.Schrader, 1982 (uncertain > unassessed )