Bacillaria ulna Nitzsch, 1817 (uncertain > unassessed )
Cylindrotheca closterium (Ehrenberg) Reimann & J.C.Lewin, 1964
Cylindrotheca gracilis (Brébisson ex Kützing) Grunow, 1882 (uncertain > unassessed )
Denticula antarctica Grunow in Cleve & Möller, 1878 (uncertain > unassessed )
Denticula antarctica McCollum, 1975 (uncertain > unassessed )
Denticula hustedtii R.Simonsen ex T.Kanaya (uncertain > unassessed )
Denticula tenuis Kützing, 1844 (uncertain > unassessed )
Denticula tenuis var. antarctica Fritsch, 1912 (uncertain > unassessed )
Denticulopsis hustedtii (R.Simonsen ex T.Kanaya) R.Simonsen † accepted as Denticula hustedtii R.Simonsen ex T.Kanaya
Fragilariopsis antarctica (Castracane) Hustedt, 1913 accepted as Fragilariopsis kerguelensis (O'Meara) Hustedt, 1952 accepted as Terebraria kerguelensis E.O'Meara, 1876 †
Fragilariopsis barbieri (M. Peragallo) Cefarelli, Ferrario & Lundholm, 2021
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 linearis (Castracane) Frenguelli, 1943 accepted as Fragilaria linearis f. linearis Castracane, 1886
Fragilariopsis linearis var. curta (Van Heurck) Frenguelli, 1958 accepted as Fragilaria curta Van Heurck, 1909
Fragilariopsis obliquecostata (van Heurck) Heiden, 1928
Fragilariopsis obliquecostata f. maxima (Van Heurck) Heiden & Kolbe, 1928 (uncertain > unassessed )
Fragilariopsis praeinterfrigidaria (McCollum) Gersonde & Barcena, 1998 (uncertain > unassessed )
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
Fragilariopsis vanheurckii (Peragallo) Hustedt, 1958 accepted as Fragilaria vanheurckii Peragallo, 1921
Hantzschia amphioxys (Ehrenberg) Grunow, 1880
Hantzschia amphioxys f. major Grunow in Van Heurck, 1881 (uncertain > unassessed )
Hantzschia amphioxys var. amphioxys (Ehrenberg) Grunow, 1877
Hantzschia amphioxys var. amphioxys f. capitata O. Müll., 1909
Hantzschia amphioxys var. capitellata Grunow in Cleve & Grunow, 1880 (uncertain > unassessed )
Hantzschia amphioxys var. elongata (Hantzsch) Grunow in Cleve & Grunow, 1880 accepted as Nitzschia elongata var. elongata Hassall, 1845
Hantzschia amphioxys var. major Grunow
Hantzschia amphioxys var. prolongata Cleve-Euler, 1952 (uncertain > unassessed )
Hantzschia amphioxys var. recta Skvortzow, 1946 (uncertain > unassessed )
Hantzschia elongata (Hantzsch) Grunow, 1877
Hantzschia linearis (O.F.Müller) Cleve-Euler (uncertain > unassessed )
Hantzschia spectabilis (Ehrenberg) Hustedt, 1959 accepted as Synedra spectabilis Ehrenberg, 1841
Hantzschia virgata (Roper) Grunow, 1880
Nitzschia acicularis (Kützing) W.Smith, 1853 (uncertain > unassessed )
Nitzschia acicularis Frenguelli, 1923 (uncertain > unassessed )
Nitzschia amphibia Grunow, 1862
Nitzschia amphioxys (Ehrenberg) W.Smith, 1853 accepted as Hantzschia amphioxys (Ehrenberg) Grunow, 1880
Nitzschia amphioxys f. major (Grunow in Van Heurck) Mayer, 1913 accepted as Hantzschia amphioxys f. major Grunow in Van Heurck, 1881
Nitzschia angulata Hasle, 1972 (uncertain > unassessed )
Nitzschia angustata (W.Smith) Grunow, 1880 accepted as Tryblionella angustata var. angustata W. Smith, 1853
Nitzschia angustata sensu Fontell, 1917 (uncertain > unassessed )
Nitzschia antarctica Okuno, 1954 (uncertain > unassessed )
Nitzschia australis (Peragallo) A.Mann, 1937 accepted as Nitzschia dubia var. australis Peragallo, 1921
Nitzschia barbieri M. Peragallo, 1921 accepted as Fragilariopsis barbieri (M. Peragallo) Cefarelli, Ferrario & Lundholm, 2021
Nitzschia barronii Gersonde, 1991 (uncertain > unassessed )
Nitzschia bicapitata Cleve, 1901 (uncertain > unassessed )
Nitzschia braarudii G.R.Hasle, 1960 (uncertain > unassessed )
Nitzschia brebissoni (uncertain > unassessed )
Nitzschia closterium (Ehrenberg) W.Smith, 1853 (uncertain > unassessed )
Nitzschia closterium Eulenstein, 1868 (uncertain > unassessed )
Nitzschia commutata Grunow, 1880
Nitzschia compacta Hustedt, 1958 (uncertain > unassessed )
Nitzschia compressa (Bailey) C.S.Boyer, 1916 accepted as Tryblionella compressa (J.W.Bailey) M.Poulin, 1990 accepted as Pyxidicula compressa var. compressa J.W. Bailey, 1851
Nitzschia constricta (Gregory) Grunow, 1880 accepted as Psammodictyon constrictum f. parvum (Grunow) Belegratis, Louvrou & Economou-Amilli, 2012
Nitzschia curta (Van Heurck) Hasle, 1972 accepted as Fragilaria curta Van Heurck, 1909
Nitzschia cylindrus (Grunow) Hasle, 1972 (uncertain > unassessed )
Nitzschia decipiens Hustedt, 1958 (uncertain > unassessed )
Nitzschia directa Pantocsek, 1902 (uncertain > unassessed )
Nitzschia dissipata (Kützing) Rabenhorst, 1860 accepted as Synedra dissipata var. dissipata Kützing, 1844
Nitzschia dubia W.Smith, 1853
Nitzschia dubia var. australis Peragallo, 1921 (uncertain > unassessed )
Nitzschia elongata Hassal, 1845 accepted as Nitzschia sigmoidea (Nitzsch) W.Smith, 1853
Nitzschia elongata var. elongata Hassall, 1845 (uncertain > unassessed )
Nitzschia filiformis (W.Smith) Hustedt
Nitzschia filiformis Hajós, 1959 (uncertain > unassessed )
Nitzschia fonticola (Grunow) Grunow, 1881
Nitzschia frustulum (Kützing) Grunow, 1880
Nitzschia frustulum var. subsalina Hustedt, 1930 (uncertain > unassessed )
Nitzschia gracilis (Brébisson in Kützing) (uncertain > unassessed )
Nitzschia gracilis Hantzsch, 1860 (uncertain > unassessed )
Nitzschia homburgiensis Lange-Bertalot, 1978 (uncertain > unassessed )
Nitzschia inflatula G.R.Hasle, 1974 (uncertain > unassessed )
Nitzschia interfrigidaria McColloum emend Ciesielski, 1983 (uncertain > unassessed )
Nitzschia kerguelensis (O'Meara) Hasle, 1965 accepted as Terebraria kerguelensis E.O'Meara, 1876 †
Nitzschia lecointei van Heurck, 1909 (uncertain > unassessed )
Nitzschia linearis W.Smith, 1853
Nitzschia linearis var. subtilis (Grunow) Hustedt, 1923 (uncertain > unassessed )
Nitzschia lineola Cleve, 1897 (uncertain > unassessed )
Nitzschia littoralis Grunow, 1880 accepted as Tryblionella littoralis (Grunow) D.G.Mann, 1990 accepted as Nitzschia littoralis var. littoralis Grunow in Cleve & Grunow, 1880
Nitzschia littoralis var. littoralis Grunow in Cleve & Grunow, 1880 (uncertain > unassessed )
Nitzschia longissima (Brébisson) Ralfs, 1861
Nitzschia marginulata Grunow, 1880 (uncertain > unassessed )
Nitzschia marginulata f. marginulata Grunow in Cleve & Möller, 1878 (uncertain > unassessed )
Nitzschia medioconstricta Hustedt, 1958 (uncertain > unassessed )
Nitzschia microcephala Grunow, 1878
Nitzschia minuta Bleisch, 1863 (uncertain > unassessed )
Nitzschia minutissima W.Smith, 1853 (uncertain > unassessed )
Nitzschia obliquecostata (Van Heurck) Hasle, 1972 accepted as Fragilaria obliquecostata f. obliquecostata Van Heurck, 1909
Nitzschia obtusa W.Smith, 1853
Nitzschia obtusa var. scalpelliformis (Grunow) Grunow, 1881 accepted as Nitzschia scalpelliformis Grunow, 1880
Nitzschia palea (Kützing) W.Smith, 1856
Nitzschia palea var. debilis (Kützing) Grunow, 1880 accepted as Synedra debilis Kützing, 1844
Nitzschia palea var. fonticola Grunow, 1879 (uncertain > unassessed )
Nitzschia palea var. romana (Grunow in Van Heurck) M. Peragallo, 1903 accepted as Nitzschia romana var. romana Grunow in Van Heurck, 1881