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
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
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