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 baculum Frenguelli, 1949 †
8. Species Nitzschia bilobata W.Smith, 1853
9. Species Nitzschia biundulata Al-Handal, J.Zimm., R.Jahn, Torstensson, A. & Wulff, A., 2019
10. Species Nitzschia bizertensis B.Smida, N.Lundholm, A.S.Hlaili & H.H.Mabrouk, 2014
11. Species Nitzschia brachygramma D.G.Mann & Trobajo, 2014
12. Species Nitzschia brittonii Hagelstein, 1939
13. Species Nitzschia calamae Frenguelli, 1936
14. Species Nitzschia carahii Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
15. Species Nitzschia carnico-barica
16. Species Nitzschia celaenoae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
17. Species Nitzschia commutata Grunow, 1880
18. Species Nitzschia curvirostris Cleve
19. Species Nitzschia dagmannii Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
20. Species Nitzschia dentatum Suriyanti & Usup, 2017
21. Species Nitzschia dicrogramma D.G.Mann & Trobajo, 2014
22. Species Nitzschia electrae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
23. Species Nitzschia filiformis (W.Smith) Hustedt
24. Species Nitzschia frustulum (Kützing) Grunow, 1880
25. Species Nitzschia gaoi Bing Liu, S.Blanco & B.Q.Huang, 2015
26. Species Nitzschia gobbii Accoroni, Romagnoli, Giulietti & Totti in Giuletti et al., 2021
27. Species Nitzschia guamensis Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
28. Species Nitzschia hemistriata Hagelstein, 1939
29. Species Nitzschia hybrida Grunow
30. Species Nitzschia insignis Gregory, 1857
31. Species Nitzschia johorensis Suriyanti & Usup, 2017
32. Species Nitzschia jordanii Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
33. Species Nitzschia kolaczeckii Grunow, 1867
34. Species Nitzschia kuetzingiana Hilse, 1863
35. Species Nitzschia longissima (Brébisson) Ralfs, 1861
36. Species Nitzschia lorenziana Grunow, 1879
37. Species Nitzschia maiae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
38. Species Nitzschia majuscula Grunow
39. Species Nitzschia meropeae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
40. Species Nitzschia nanodissipata Ch.Li & Witkowski in Witkowski et al., 2016
41. Species Nitzschia navis-varingica N.Lundholm & Ø.Moestrup, 2000
42. Species Nitzschia obtusa W.Smith, 1853
43. Species Nitzschia omanensis Barkia I. & Ch. Li, 2019
44. Species Nitzschia ovalis H.J.Arnott, 1880
45. Species Nitzschia papillosa Bertolli, Talgatti & Torgan, 2016
46. Species Nitzschia pararostrata (H.Lange-Bertalot) H.Lange-Bertalot, in Nevo & Wasser, 2000
47. Species Nitzschia parkii D.G.Mann & Trobajo, 2014
48. Species Nitzschia parvula W.Smith, 1853
49. Species Nitzschia peragallii Hasle, 1965
50. Species Nitzschia porteri Frenguelli, 1949 †
51. Species Nitzschia punae Frenguelli, 1936
52. Species Nitzschia sancti-francisci A. Witkowski & Lange-Bertalot in Witkowski et al., 2015
53. Species Nitzschia sansimoni S.Blanco, I.Alvarez-Blanco & C.Cejudo-Figueiras, 2012
54. Species Nitzschia schefterae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
55. Species Nitzschia scoliotropis Cleve, 1900
56. Species Nitzschia sicula (Castracane) Hustedt
57. Species Nitzschia simsiae Witkowski, Lange-Bertalot & Kociolek in Witkowski et al., 2015
58. Species Nitzschia spathulata W.Smith, 1853
59. Species Nitzschia spathulatoides Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
60. Species Nitzschia spectabilis (Ehrenberg) Ralfs, 1861
61. Species Nitzschia taygeteae Lobban, Ashworth, Calaor & E.C.Ther. in Lobban et al., 2019
62. Species Nitzschia thermalis (Ehrenberg) Auerswald, 1861
63. Species Nitzschia tiltilensis Frenguelli, 1949 †
64. Species Nitzschia traheaformis Ch.Li, Witkowski & Sh.Yu in Witkowski et al., 2016
65. Species Nitzschia trobajoae A.Witkowski, Lange-Bertalot & Kociolek in Witkowski et al., 2015
66. Species Nitzschia tryblionella Hantzsch, 1860
67. Species Nitzschia volvendirostrata Ashworth, Dᶏbek & Witkowski in Witkowski et al., 2016
68. Species Nitzschia yunchengensis Xie & Li, 1994
69. Species Nitzschia acuminata (W.Smith) Grunow, 1880 accepted as Tryblionella acuminata W.Smith, 1853 (Synonym)
70. Species Nitzschia adeliae Frenguelli, 1960 (unaccepted > nomen nudum, invalidly published)
71. Species Nitzschia apiculata (Gregory) Grunow, 1878 accepted as Tryblionella apiculata Gregory, 1857 (Synonym)
72. Species Nitzschia apiculata (W.Gregory) Grunow, 1880 accepted as (synonym)
73. Species Nitzschia baculum Frenguelli & Orlando, 1959 (unaccepted > nomen nudum)
74. Species Nitzschia barbieri M. Peragallo, 1921 accepted as Fragilariopsis barbieri (M. Peragallo) Cefarelli, Ferrario & Lundholm, 2021 (Basionym)
75. Species Nitzschia curvula W.Smith, 1856 accepted as Stenopterobia curvula (W.Smith) Krammer, 1987 accepted as Nitzschia curvula var. curvula W. Smith, 1856 (Basionym)
76. Species Nitzschia cylindriformis Hasle, 1984 accepted as Fragilariopsis cylindriformis (Hasle) Hasle, 1993
77. Species Nitzschia elongata Hassal, 1845 accepted as Nitzschia sigmoidea (Nitzsch) W.Smith, 1853 (synonym)
78. Species Nitzschia hungarica Grunow, 1862 accepted as Tryblionella hungarica (Grunow) Frenguelli, 1942 accepted as Nitzschia hungarica f. hungarica Grunow, 1862 (Basionym)
79. Species Nitzschia navicularis (Brébisson) Grunow, 1880 accepted as Tryblionella navicularis (Brébisson) Ralfs, 1861 accepted as Surirella navicularis Brébisson, 1849 (Synonym)
80. Species Nitzschia paradoxa (J.F.Gmelin) Grunow, 1880 accepted as Bacillaria paxillifera (O.F.Müller) T.Marsson, 1901 (synonym)
81. Species Nitzschia peragalli Hasle, 1965 accepted as Fragilariopsis peragallii (Hasle) Cremer, 2003 (Basionym)
82. Species Nitzschia punctata (W.Smith) Grunow, 1878 accepted as Tryblionella punctata W.Smith, 1853 (Synonym)
83. Species Nitzschia seratia Cleve accepted as Nitzschia seriata Cleve, 1883 accepted as Pseudo-nitzschia seriata (Cleve) H.Peragallo, 1899 (misspelling)
84. Species Nitzschia seriata Cleve, 1883 accepted as Pseudo-nitzschia seriata (Cleve) H.Peragallo, 1899 (Synonym)
85. Species Nitzschia solida J.Frenguelli & H.A.Orlando, 1958 (unaccepted > nomen nudum, invalidly published)
86. Species Nitzschia stagnorum Rabenhorst, 1860 accepted as Nitzschia umbonata (Ehrenberg) Lange-Bertalot, 1978 accepted as Navicula umbonata Ehrenberg, 1837 (Synonym)
87. Species Nitzschia virgata Roper, 1858 accepted as Hantzschia virgata (Roper) Grunow, 1880 (synonym)
88. Species Nitzschia aciculariformis Manguin, 1957 (uncertain > unassessed)
89. Species Nitzschia acicularis (Kützing) W.Smith, 1853 (uncertain > unassessed)
90. Species Nitzschia actydrophila Hasle, 1965 (uncertain > unassessed)
91. Species Nitzschia aequatorialis Heiden, 1928 (uncertain > unassessed)
92. Species Nitzschia amabilis Suzuki, 2010 (uncertain > unassessed)
93. Species Nitzschia americana Hasle, 1964 (uncertain > unassessed)
94. Species Nitzschia angulata Hasle, 1972 (uncertain > unassessed)
95. Species Nitzschia angusteforaminata Lange-Bertalot, 1980 (uncertain > unassessed)
96. Species Nitzschia antarctica Okuno, 1954 (uncertain > unassessed)
97. Species Nitzschia australis (Peragallo) A.Mann, 1937 accepted as Nitzschia dubia var. australis Peragallo, 1921 (uncertain > unassessed)
98. Species Nitzschia barkleyi Hustedt, 1952 (uncertain > unassessed)
99. Species Nitzschia bathurstensis M.H.Giffen, 1970 (uncertain > unassessed)
100. Species Nitzschia bicapitata Cleve, 1901 (uncertain > unassessed)
101. Species Nitzschia birostrata W.Smith, 1853 (uncertain > unassessed)
102. Species Nitzschia braarudii G.R.Hasle, 1960 (uncertain > unassessed)
103. Species Nitzschia buschbeckii Witkowski, Lange-Bertalot & Ruppel, 2004 (uncertain > unassessed)
104. Species Nitzschia capitata Østrup, 1913 accepted as Homoeocladia capitata H.L. Smith, 1874 (uncertain > unassessed)
105. Species Nitzschia capuluspalae Simonsen, 1965 (uncertain > unassessed)
106. Species Nitzschia closterium (Ehrenberg) W.Smith, 1853 (uncertain > unassessed)
107. Species Nitzschia coarctata Grunow, 1880 (uncertain > unassessed)
108. Species Nitzschia compacta Hustedt, 1958 (uncertain > unassessed)
109. Species Nitzschia constricta (Gregory) Grunow, 1880 accepted as Psammodictyon constrictum f. parvum (Grunow) Belegratis, Louvrou & Economou-Amilli, 2012 (uncertain > unassessed)
110. Species Nitzschia cuspidata Hasle, 1965 (uncertain > unassessed)
111. Species Nitzschia cylindrus (Grunow) Hasle, 1972 (uncertain > unassessed)
112. Species Nitzschia decipiens Hustedt, 1958 (uncertain > unassessed)
113. Species Nitzschia delicatissima Cleve, 1897 (uncertain > unassessed)
114. Species Nitzschia delicatula Hasle, 1965 (uncertain > unassessed)
115. Species Nitzschia diducta Hustedt, 1938 (uncertain > unassessed)
116. Species Nitzschia dietrichii Simonsen, 1974 (uncertain > unassessed)
117. Species Nitzschia divaricata Meunier, 1910 (uncertain > unassessed)
118. Species Nitzschia epithemiformis Lange-Bertalot, 1980 (uncertain > unassessed)
119. Species Nitzschia epithemoides Grunow, 1880 (uncertain > unassessed)
120. Species Nitzschia fontifuga Cholnoky, 1962 (uncertain > unassessed)
121. Species Nitzschia fossalis Hustedt, 1942 (uncertain > unassessed)
122. Species Nitzschia fraudulenta Cleve, 1897 (uncertain > unassessed)
123. Species Nitzschia frigida Grunow, 1880 (uncertain > unassessed)
124. Species Nitzschia gazellae Karsten, 1905 (uncertain > unassessed)
125. Species Nitzschia gelida Grunow (uncertain > unassessed)
126. Species Nitzschia granii G.R.Hasle, 1964 (uncertain > unassessed)
127. Species Nitzschia granulata Grunow, 1880 (uncertain > unassessed)
128. Species Nitzschia grunowii Hasle, 1972 (uncertain > unassessed)
129. Species Nitzschia gyrosigma Ohtsuka, 2005 (uncertain > unassessed)
130. Species Nitzschia heimii (Manguin) Hasle, 1965 accepted as Pseudonitzschia heimii Manguin, 1960 (uncertain > unassessed)
131. Species Nitzschia holsatica Hustedt, 1930 (uncertain > unassessed)
132. Species Nitzschia inflatula G.R.Hasle, 1974 (uncertain > unassessed)
133. Species Nitzschia interruptestriata Simonsen, 1974 (uncertain > unassessed)
134. Species Nitzschia kalganica Skvortzov, 2012 (uncertain)
135. Species Nitzschia kerguelensis (O'Meara) Hasle, 1965 accepted as Terebraria kerguelensis E.O'Meara, 1876 † (uncertain > unassessed)
136. Species Nitzschia kowiensis Giffen, 1970 (uncertain > unassessed)
137. Species Nitzschia laevis Hustedt, 1939 (uncertain > unassessed)
138. Species Nitzschia lecointei van Heurck, 1909 (uncertain > unassessed)
139. Species Nitzschia ligowskii Witkowski, Lange-Bertalot, Kociolek & Brzezinska, 2004 (uncertain > unassessed)
140. Species Nitzschia lineata (Castracane) Hasle, 1972 (uncertain > unassessed)
141. Species Nitzschia lineola Cleve, 1897 (uncertain > unassessed)
142. Species Nitzschia marginulata Grunow, 1880 (uncertain > unassessed)
143. Species Nitzschia marina Grunow, 1880 (uncertain > unassessed)
144. Species Nitzschia medioconstricta Hustedt, 1958 (uncertain > unassessed)
145. Species Nitzschia migrans Cleve, 1897 (uncertain > unassessed)
146. Species Nitzschia minutissima W.Smith, 1853 (uncertain > unassessed)
147. Species Nitzschia multistriata Takano, 1993 (uncertain > unassessed)
148. Species Nitzschia obliquecostata (Van Heurck) Hasle, 1972 accepted as Fragilaria obliquecostata f. obliquecostata Van Heurck, 1909 (uncertain > unassessed)
149. Species Nitzschia ossiformis (Taylor) Simonsen, 1974 accepted as Synedra ossiformis Taylor, 1967 (uncertain > unassessed)
150. Species Nitzschia paaschei Hasle, 1965 (uncertain > unassessed)
151. Species Nitzschia pacifica Cupp, 1943 (uncertain > unassessed)
152. Species Nitzschia paxillifer (O.F.Müller) Heiberg, 1863 accepted as Bacillaria paxillifera (O.F.Müller) T.Marsson, 1901 (uncertain > unassessed)
153. Species Nitzschia perpusilla Rabenhorst, (1861)1864 (uncertain > unassessed)
154. Species Nitzschia persuadens Cholnoky, 1961 (uncertain > unassessed)
155. Species Nitzschia petitiana Grunow, 1880 (uncertain > unassessed)
156. Species Nitzschia polaris Grunow ex Cleve, 1883 (uncertain > unassessed)
157. Species Nitzschia praelonga Cleve, 1881 (uncertain > unassessed)
158. Species Nitzschia prolongata Manguin, 1957 (uncertain > unassessed)
159. Species Nitzschia prolongatoides G.R.Hasle, 1965 (uncertain > unassessed)
160. Species Nitzschia promare Medlin, 1990 (uncertain > unassessed)
161. Species Nitzschia pseudodelicatissima Hasle, 1976 (uncertain > unassessed)
162. Species Nitzschia pseudonana Hasle, 1974 (uncertain > unassessed)
163. Species Nitzschia pseudoseriata G.R.Hasle, 1965 accepted as Pseudonitzschia australis Frenguelli, 1939 (uncertain > unassessed)
164. Species Nitzschia pubens Cholnoky, 1960 (uncertain > unassessed)
165. Species Nitzschia pungens Grunow ex Cleve, 1897 (uncertain > unassessed)
166. Species Nitzschia pungiformis G.R.Hasle, 1971 (uncertain > unassessed)
167. Species Nitzschia quickiana Hagelstein, 1939 (uncertain > unassessed)
168. Species Nitzschia ritscheri (Hustedt) Hasle, 1972 accepted as Fragilariopsis ritscheri Hustedt, 1958 (uncertain > unassessed)
169. Species Nitzschia romanowiana Pantocsek, 1902 (uncertain > unassessed)
170. Species Nitzschia schweikertii Witkowski, Lange-Bertalot, Ruppel & Kociolek, 2004 (uncertain > unassessed)
171. Species Nitzschia separanda (Hustedt) Hasle, 1972 accepted as Fragilariopsis separanda Hustedt, 1958 (uncertain > unassessed)
172. Species Nitzschia sibula M.H.Giffen, 1973 (uncertain > unassessed)
173. Species Nitzschia sinensis Liu et al., 1984 (uncertain > unassessed)
174. Species Nitzschia stellata Manguin, 1957 (uncertain > unassessed)
175. Species Nitzschia stompsii Cholnoky, 1963 (uncertain > unassessed)
176. Species Nitzschia subcurvata G.R.Hasle, 1964 (uncertain > unassessed)
177. Species Nitzschia taenia W.Smith, 1853 (uncertain > unassessed)
178. Species Nitzschia tubicola Grunow, 1880 (uncertain > unassessed)
179. Species Nitzschia turgiduloides G.R.Hasle, 1965 (uncertain > unassessed)
180. Species Nitzschia vacillata Giffen, 1967 (uncertain > unassessed)
181. Species Nitzschia vanheurckii (Peragallo) Hasle, 1972 accepted as Fragilaria vanheurckii Peragallo, 1921 (uncertain > unassessed)

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