1. Species Nitzschia abelmanniae A.Witkowski & Lange-Bertalot in Witkowski et al., 2015
2. Species Nitzschia alcyoneae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
3. Species Nitzschia angularis W.Smith, 1853
4. Species Nitzschia arenosa M.Garcia-Baptista, 1992
5. Species Nitzschia arierae Bing Liu, S.Blanco & B.Q.Huang, 2015
6. Species Nitzschia asteropeae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
7. Species Nitzschia bilobata W.Smith, 1853
8. Species Nitzschia biundulata Al-Handal, J.Zimm., R.Jahn, Torstensson, A. & Wulff, A., 2019
9. Species Nitzschia bizertensis B.Smida, N.Lundholm, A.S.Hlaili & H.H.Mabrouk, 2014
10. Species Nitzschia brachygramma D.G.Mann & Trobajo, 2014
11. Species Nitzschia brittonii Hagelstein, 1939
12. Species Nitzschia calamae Frenguelli, 1936
13. Species Nitzschia carahii Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
14. Species Nitzschia carnico-barica
15. Species Nitzschia celaenoae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
16. Species Nitzschia commutata Grunow, 1880
17. Species Nitzschia curvirostris Cleve
18. Species Nitzschia dagmannii Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
19. Species Nitzschia dentatum Suriyanti & Usup, 2017
20. Species Nitzschia dicrogramma D.G.Mann & Trobajo, 2014
21. Species Nitzschia electrae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
22. Species Nitzschia filiformis (W.Smith) Hustedt
23. Species Nitzschia frustulum (Kützing) Grunow, 1880
24. Species Nitzschia gaoi Bing Liu, S.Blanco & B.Q.Huang, 2015
25. Species Nitzschia gobbii Accoroni, Romagnoli, Giulietti & Totti in Giuletti et al., 2021
26. Species Nitzschia guamensis Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
27. Species Nitzschia hemistriata Hagelstein, 1939
28. Species Nitzschia hybrida Grunow
29. Species Nitzschia insignis Gregory, 1857
30. Species Nitzschia johorensis Suriyanti & Usup, 2017
31. Species Nitzschia jordanii Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
32. Species Nitzschia kolaczeckii Grunow, 1867
33. Species Nitzschia kuetzingiana Hilse, 1863
34. Species Nitzschia longissima (Brébisson) Ralfs, 1861
35. Species Nitzschia lorenziana Grunow, 1879
36. Species Nitzschia maiae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
37. Species Nitzschia majuscula Grunow
38. Species Nitzschia meropeae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
39. Species Nitzschia nanodissipata Ch.Li & Witkowski in Witkowski et al., 2016
40. Species Nitzschia navis-varingica N.Lundholm & Ø.Moestrup, 2000
41. Species Nitzschia obtusa W.Smith, 1853
42. Species Nitzschia omanensis Barkia I. & Ch. Li, 2019
43. Species Nitzschia ovalis H.J.Arnott, 1880
44. Species Nitzschia papillosa Bertolli, Talgatti & Torgan, 2016
45. Species Nitzschia pararostrata (H.Lange-Bertalot) H.Lange-Bertalot, in Nevo & Wasser, 2000
46. Species Nitzschia parkii D.G.Mann & Trobajo, 2014
47. Species Nitzschia parvula W.Smith, 1853
48. Species Nitzschia peragallii Hasle, 1965
49. Species Nitzschia punae Frenguelli, 1936
50. Species Nitzschia sancti-francisci A. Witkowski & Lange-Bertalot in Witkowski et al., 2015
51. Species Nitzschia sansimoni S.Blanco, I.Alvarez-Blanco & C.Cejudo-Figueiras, 2012
52. Species Nitzschia schefterae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
53. Species Nitzschia scoliotropis Cleve, 1900
54. Species Nitzschia sicula (Castracane) Hustedt
55. Species Nitzschia simsiae Witkowski, Lange-Bertalot & Kociolek in Witkowski et al., 2015
56. Species Nitzschia spathulata W.Smith, 1853
57. Species Nitzschia spathulatoides Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
58. Species Nitzschia spectabilis (Ehrenberg) Ralfs, 1861
59. Species Nitzschia taygeteae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
60. Species Nitzschia thermalis (Ehrenberg) Auerswald, 1861
61. Species Nitzschia traheaformis Ch.Li, Witkowski & Sh.Yu in Witkowski et al., 2016
62. Species Nitzschia trobajoae A.Witkowski, Lange-Bertalot & Kociolek in Witkowski et al., 2015
63. Species Nitzschia tryblionella Hantzsch, 1860
64. Species Nitzschia volvendirostrata Ashworth, Dᶏbek & Witkowski in Witkowski et al., 2016
65. Species Nitzschia yunchengensis Xie & Li, 1994
66. Species Nitzschia acuminata (W.Smith) Grunow, 1880 accepted as Tryblionella acuminata W.Smith, 1853 (Synonym)
67. Species Nitzschia adeliae Frenguelli, 1960 (unaccepted > nomen nudum, invalidly published)
68. Species Nitzschia apiculata (Gregory) Grunow, 1878 accepted as Tryblionella apiculata Gregory, 1857 (Synonym)
69. Species Nitzschia apiculata (W.Gregory) Grunow, 1880 accepted as (synonym)
70. Species Nitzschia baculum Frenguelli & Orlando, 1959 (unaccepted > nomen nudum)
71. Species Nitzschia barbieri M. Peragallo, 1921 accepted as Fragilariopsis barbieri (M. Peragallo) Cefarelli, Ferrario & Lundholm, 2021 (Basionym)
72. Species Nitzschia curvula W.Smith, 1856 accepted as Stenopterobia curvula (W.Smith) Krammer, 1987 accepted as Nitzschia curvula var. curvula W. Smith, 1856 (Basionym)
73. Species Nitzschia cylindriformis Hasle, 1984 accepted as Fragilariopsis cylindriformis (Hasle) Hasle, 1993
74. Species Nitzschia elongata Hassal, 1845 accepted as Nitzschia sigmoidea (Nitzsch) W.Smith, 1853 (synonym)
75. Species Nitzschia hungarica Grunow, 1862 accepted as Tryblionella hungarica (Grunow) Frenguelli, 1942 accepted as Nitzschia hungarica f. hungarica Grunow, 1862 (Basionym)
76. Species Nitzschia navicularis (Brébisson) Grunow, 1880 accepted as Tryblionella navicularis (Brébisson) Ralfs, 1861 accepted as Surirella navicularis Brébisson, 1849 (Synonym)
77. Species Nitzschia paradoxa (J.F.Gmelin) Grunow, 1880 accepted as Bacillaria paxillifera (O.F.Müller) T.Marsson, 1901 (synonym)
78. Species Nitzschia peragalli Hasle, 1965 accepted as Fragilariopsis peragallii (Hasle) Cremer, 2003 (Basionym)
79. Species Nitzschia punctata (W.Smith) Grunow, 1878 accepted as Tryblionella punctata W.Smith, 1853 (Synonym)
80. Species Nitzschia seratia Cleve accepted as Nitzschia seriata Cleve, 1883 accepted as Pseudo-nitzschia seriata (Cleve) H.Peragallo, 1899 (misspelling)
81. Species Nitzschia seriata Cleve, 1883 accepted as Pseudo-nitzschia seriata (Cleve) H.Peragallo, 1899 (Synonym)
82. Species Nitzschia solida J.Frenguelli & H.A.Orlando, 1958 (unaccepted > nomen nudum, invalidly published)
83. Species Nitzschia stagnorum Rabenhorst, 1860 accepted as Nitzschia umbonata (Ehrenberg) Lange-Bertalot, 1978 accepted as Navicula umbonata Ehrenberg, 1837 (Synonym)
84. Species Nitzschia virgata Roper, 1858 accepted as Hantzschia virgata (Roper) Grunow, 1880 (synonym)
85. Species Nitzschia aciculariformis Manguin, 1957 (uncertain > unassessed)
86. Species Nitzschia acicularis (Kützing) W.Smith, 1853 (uncertain > unassessed)
87. Species Nitzschia actydrophila Hasle, 1965 (uncertain > unassessed)
88. Species Nitzschia aequatorialis Heiden, 1928 (uncertain > unassessed)
89. Species Nitzschia amabilis Suzuki, 2010 (uncertain > unassessed)
90. Species Nitzschia americana Hasle, 1964 (uncertain > unassessed)
91. Species Nitzschia angulata Hasle, 1972 (uncertain > unassessed)
92. Species Nitzschia angusteforaminata Lange-Bertalot, 1980 (uncertain > unassessed)
93. Species Nitzschia antarctica Okuno, 1954 (uncertain > unassessed)
94. Species Nitzschia australis (Peragallo) A.Mann, 1937 accepted as Nitzschia dubia var. australis Peragallo, 1921 (uncertain > unassessed)
95. Species Nitzschia barkleyi Hustedt, 1952 (uncertain > unassessed)
96. Species Nitzschia bathurstensis M.H.Giffen, 1970 (uncertain > unassessed)
97. Species Nitzschia bicapitata Cleve, 1901 (uncertain > unassessed)
98. Species Nitzschia birostrata W.Smith, 1853 (uncertain > unassessed)
99. Species Nitzschia braarudii G.R.Hasle, 1960 (uncertain > unassessed)
100. Species Nitzschia buschbeckii Witkowski, Lange-Bertalot & Ruppel, 2004 (uncertain > unassessed)
101. Species Nitzschia capitata Østrup, 1913 accepted as Homoeocladia capitata H.L. Smith, 1874 (uncertain > unassessed)
102. Species Nitzschia capuluspalae Simonsen, 1965 (uncertain > unassessed)
103. Species Nitzschia closterium (Ehrenberg) W.Smith, 1853 (uncertain > unassessed)
104. Species Nitzschia coarctata Grunow, 1880 (uncertain > unassessed)
105. Species Nitzschia compacta Hustedt, 1958 (uncertain > unassessed)
106. Species Nitzschia constricta (Gregory) Grunow, 1880 accepted as Psammodictyon constrictum f. parvum (Grunow) Belegratis, Louvrou & Economou-Amilli, 2012 (uncertain > unassessed)
107. Species Nitzschia cuspidata Hasle, 1965 (uncertain > unassessed)
108. Species Nitzschia cylindrus (Grunow) Hasle, 1972 (uncertain > unassessed)
109. Species Nitzschia decipiens Hustedt, 1958 (uncertain > unassessed)
110. Species Nitzschia delicatissima Cleve, 1897 (uncertain > unassessed)
111. Species Nitzschia delicatula Hasle, 1965 (uncertain > unassessed)
112. Species Nitzschia diducta Hustedt, 1938 (uncertain > unassessed)
113. Species Nitzschia dietrichii Simonsen, 1974 (uncertain > unassessed)
114. Species Nitzschia divaricata Meunier, 1910 (uncertain > unassessed)
115. Species Nitzschia epithemiformis Lange-Bertalot, 1980 (uncertain > unassessed)
116. Species Nitzschia epithemoides Grunow, 1880 (uncertain > unassessed)
117. Species Nitzschia fontifuga Cholnoky, 1962 (uncertain > unassessed)
118. Species Nitzschia fossalis Hustedt, 1942 (uncertain > unassessed)
119. Species Nitzschia fraudulenta Cleve, 1897 (uncertain > unassessed)
120. Species Nitzschia frigida Grunow, 1880 (uncertain > unassessed)
121. Species Nitzschia gazellae Karsten, 1905 (uncertain > unassessed)
122. Species Nitzschia gelida Grunow (uncertain > unassessed)
123. Species Nitzschia granii G.R.Hasle, 1964 (uncertain > unassessed)
124. Species Nitzschia granulata Grunow, 1880 (uncertain > unassessed)
125. Species Nitzschia grunowii Hasle, 1972 (uncertain > unassessed)
126. Species Nitzschia gyrosigma Ohtsuka, 2005 (uncertain > unassessed)
127. Species Nitzschia heimii (Manguin) Hasle, 1965 accepted as Pseudonitzschia heimii Manguin, 1960 (uncertain > unassessed)
128. Species Nitzschia holsatica Hustedt, 1930 (uncertain > unassessed)
129. Species Nitzschia inflatula G.R.Hasle, 1974 (uncertain > unassessed)
130. Species Nitzschia interruptestriata Simonsen, 1974 (uncertain > unassessed)
131. Species Nitzschia kalganica Skvortzov, 2012 (uncertain)
132. Species Nitzschia kerguelensis (O'Meara) Hasle, 1965 accepted as Terebraria kerguelensis E.O'Meara, 1876 † (uncertain > unassessed)
133. Species Nitzschia kowiensis Giffen, 1970 (uncertain > unassessed)
134. Species Nitzschia laevis Hustedt, 1939 (uncertain > unassessed)
135. Species Nitzschia lecointei van Heurck, 1909 (uncertain > unassessed)
136. Species Nitzschia ligowskii Witkowski, Lange-Bertalot, Kociolek & Brzezinska, 2004 (uncertain > unassessed)
137. Species Nitzschia lineata (Castracane) Hasle, 1972 (uncertain > unassessed)
138. Species Nitzschia lineola Cleve, 1897 (uncertain > unassessed)
139. Species Nitzschia marginulata Grunow, 1880 (uncertain > unassessed)
140. Species Nitzschia marina Grunow, 1880 (uncertain > unassessed)
141. Species Nitzschia medioconstricta Hustedt, 1958 (uncertain > unassessed)
142. Species Nitzschia migrans Cleve, 1897 (uncertain > unassessed)
143. Species Nitzschia minutissima W.Smith, 1853 (uncertain > unassessed)
144. Species Nitzschia multistriata Takano, 1993 (uncertain > unassessed)
145. Species Nitzschia obliquecostata (Van Heurck) Hasle, 1972 accepted as Fragilaria obliquecostata f. obliquecostata Van Heurck, 1909 (uncertain > unassessed)
146. Species Nitzschia ossiformis (Taylor) Simonsen, 1974 accepted as Synedra ossiformis Taylor, 1967 (uncertain > unassessed)
147. Species Nitzschia paaschei Hasle, 1965 (uncertain > unassessed)
148. Species Nitzschia pacifica Cupp, 1943 (uncertain > unassessed)
149. Species Nitzschia paxillifer (O.F.Müller) Heiberg, 1863 accepted as Bacillaria paxillifera (O.F.Müller) T.Marsson, 1901 (uncertain > unassessed)
150. Species Nitzschia perpusilla Rabenhorst, (1861)1864 (uncertain > unassessed)
151. Species Nitzschia persuadens Cholnoky, 1961 (uncertain > unassessed)
152. Species Nitzschia petitiana Grunow, 1880 (uncertain > unassessed)
153. Species Nitzschia polaris Grunow ex Cleve, 1883 (uncertain > unassessed)
154. Species Nitzschia praelonga Cleve, 1881 (uncertain > unassessed)
155. Species Nitzschia prolongata Manguin, 1957 (uncertain > unassessed)
156. Species Nitzschia prolongatoides G.R.Hasle, 1965 (uncertain > unassessed)
157. Species Nitzschia promare Medlin, 1990 (uncertain > unassessed)
158. Species Nitzschia pseudodelicatissima Hasle, 1976 (uncertain > unassessed)
159. Species Nitzschia pseudonana Hasle, 1974 (uncertain > unassessed)
160. Species Nitzschia pseudoseriata G.R.Hasle, 1965 accepted as Pseudonitzschia australis Frenguelli, 1939 (uncertain > unassessed)
161. Species Nitzschia pubens Cholnoky, 1960 (uncertain > unassessed)
162. Species Nitzschia pungens Grunow ex Cleve, 1897 (uncertain > unassessed)
163. Species Nitzschia pungiformis G.R.Hasle, 1971 (uncertain > unassessed)
164. Species Nitzschia quickiana Hagelstein, 1939 (uncertain > unassessed)
165. Species Nitzschia ritscheri (Hustedt) Hasle, 1972 accepted as Fragilariopsis ritscheri Hustedt, 1958 (uncertain > unassessed)
166. Species Nitzschia romanowiana Pantocsek, 1902 (uncertain > unassessed)
167. Species Nitzschia schweikertii Witkowski, Lange-Bertalot, Ruppel & Kociolek, 2004 (uncertain > unassessed)
168. Species Nitzschia separanda (Hustedt) Hasle, 1972 accepted as Fragilariopsis separanda Hustedt, 1958 (uncertain > unassessed)
169. Species Nitzschia sibula M.H.Giffen, 1973 (uncertain > unassessed)
170. Species Nitzschia sinensis Liu et al., 1984 (uncertain > unassessed)
171. Species Nitzschia stellata Manguin, 1957 (uncertain > unassessed)
172. Species Nitzschia stompsii Cholnoky, 1963 (uncertain > unassessed)
173. Species Nitzschia subcurvata G.R.Hasle, 1964 (uncertain > unassessed)
174. Species Nitzschia taenia W.Smith, 1853 (uncertain > unassessed)
175. Species Nitzschia tubicola Grunow, 1880 (uncertain > unassessed)
176. Species Nitzschia turgiduloides G.R.Hasle, 1965 (uncertain > unassessed)
177. Species Nitzschia vacillata Giffen, 1967 (uncertain > unassessed)
178. Species Nitzschia vanheurckii (Peragallo) Hasle, 1972 accepted as Fragilaria vanheurckii Peragallo, 1921 (uncertain > unassessed)

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