Cylindrotheca closterium (Ehrenberg) Reimann & J.C.Lewin, 1964
Fragilariopsis curta (Van Heurck) Hustedt, 1958
Fragilariopsis cylindrus (Grunow) Krieger, 1954 (uncertain > unassessed )
Fragilariopsis doliolus (Wallich) Medlin & P.A.Sims, 1993
Fragilariopsis kerguelensis (O'Meara) Hustedt, 1952 accepted as Terebraria kerguelensis E.O'Meara, 1876 †
Fragilariopsis obliquecostata (van Heurck) Heiden, 1928
Fragilariopsis oceanica (Cleve) Hasle, 1965 accepted as Fragilaria oceanica f. oceanica Cleve, 1873
Fragilariopsis pseudonana (Hasle) Hasle, 1993 (uncertain > unassessed )
Fragilariopsis rhombica (O'Meara) Hustedt, 1952 accepted as Diatoma rhombica E.O'Meara, 1877
Fragilariopsis ritscheri Hustedt, 1958 (uncertain > unassessed )
Fragilariopsis separanda Hustedt, 1958 (uncertain > unassessed )
Fragilariopsis sublinearis (Van Heurck) Heiden & Kolbe, 1943 accepted as Fragilariopsis obliquecostata (van Heurck) Heiden, 1928
Haslea trompii (Cleve) Simonsen, 1974 accepted as Navicula trompii var. trompii Cleve, 1900
Navicula directa (W.Smith) Ralfs, 1861 accepted as Pinnularia directa var. directa W. Smith, 1853
Navicula trompii Cleve, 1901 accepted as Haslea trompii (Cleve) Simonsen, 1974 accepted as Navicula trompii var. trompii Cleve, 1900
Navicula trompii var. trompii Cleve, 1900 (uncertain > unassessed )
Nitzschia bicapitata Cleve, 1901 (uncertain > unassessed )
Nitzschia braarudii G.R.Hasle, 1960 (uncertain > unassessed )
Nitzschia closterium (Ehrenberg) W.Smith, 1853 (uncertain > unassessed )
Nitzschia cylindrus (Grunow) Hasle, 1972 (uncertain > unassessed )
Nitzschia delicatissima Cleve, 1897 (uncertain > unassessed )
Nitzschia delicatula Hasle, 1965 (uncertain > unassessed )
Nitzschia grunowii Hasle, 1972 (uncertain > unassessed )
Nitzschia heimii (Manguin) Hasle, 1965 accepted as Pseudonitzschia heimii Manguin, 1960
Nitzschia lineola Cleve, 1897 (uncertain > unassessed )
Nitzschia longissima (Brébisson) Ralfs, 1861
Nitzschia pseudodelicatissima Hasle, 1976 (uncertain > unassessed )
Nitzschia pseudonana Hasle, 1974 (uncertain > unassessed )
Nitzschia seratia Cleve accepted as Nitzschia seriata Cleve, 1883 accepted as Pseudo-nitzschia seriata (Cleve) H.Peragallo, 1899
Nitzschia seriata Cleve, 1883 accepted as Pseudo-nitzschia seriata (Cleve) H.Peragallo, 1899
Pinnularia directa W.Smith, 1853 accepted as Navicula directa (W.Smith) Ralfs, 1861 accepted as Pinnularia directa var. directa W. Smith, 1853
Pinnularia directa var. directa W. Smith, 1853 (uncertain > unassessed )
Pleurosigma directum Grunow, 1880
Pseudoeunotia doliolus (Wallich) Grunow, 1880 accepted as Fragilariopsis doliolus (Wallich) Medlin & P.A.Sims, 1993
Pseudo-nitzschia delicatissima (Cleve) Heiden, 1928
Pseudonitzschia heimii Manguin, 1960 (uncertain > unassessed )
Pseudo-nitzschia heimii Manguin, 1957
Pseudo-nitzschia lineola (Cleve) Hasle, 1965
Pseudo-nitzschia pseudodelicatissima (Hasle) Hasle, 1993
Pseudo-nitzschia seriata (Cleve) H.Peragallo, 1899
Pseudo-nitzschia turgidula (Hustedt) G.R.Hasle, 1993
Pseudo-nitzschia turgiduloides (G.R.Hasle) G.R.Hasle, 1996
Terebraria kerguelensis E.O'Meara, 1876 † (uncertain > unassessed )