1. Species Thalassiosira antiqua (Grunow) Cleve
2. Species Thalassiosira baltica (Grunow) Ostenfeld, 1901
3. Species Thalassiosira bioculata (Grunow) Ostenfeld, 1903
4. Species Thalassiosira catharinensis M. Garcia in M. Garcia & D. Bärwaldt Dutra, 2016
5. Species Thalassiosira decipiens (Grunow) E.G.Jørgensen, 1905
6. Species Thalassiosira elliptipora J.Fenner ex A.D.Mahood & J.A.Barron
7. Species Thalassiosira flexuosa (J.Brun) F.Akiba & Y.Yanagisawa
8. Species Thalassiosira fryxelliae Sunesen & Sar, 2004
9. Species Thalassiosira gerloffii Rivera, 1981
10. Species Thalassiosira gravida Cleve, 1896
11. Species Thalassiosira hyalina (Grunow) Gran, 1897
12. Species Thalassiosira laevis Gao & Cheng, 1992
13. Species Thalassiosira livingstoniorum A.K.S.K.Prasad, P.Hargraves & J.A.Nienow, 2011
14. Species Thalassiosira minicosmica Lee & Park, 2015
15. Species Thalassiosira minuscula Krasske, 1941
16. Species Thalassiosira nitzschioides (Grunow) Mereschkowsky, 1902
17. Species Thalassiosira nordenskioeldii Cleve, 1873
18. Species Thalassiosira oliverana
19. Species Thalassiosira profunda (Hendey) Hasle, 1973
20. Species Thalassiosira sundarbana B. Samanta & P. Bhadury, 2015
21. Species Thalassiosira blanda (A.Schmidt) T.V.Desikachary & Gowthaman, 1989 accepted as Planktoniella blanda (A.Schmidt) E.E.Syvertsen & G.R.Hasle, 1993
22. Species Thalassiosira fluviatilis Hustedt, 1926 accepted as Thalassiosira weissflogii (Grunow) G.Fryxell & Hasle, 1977 accepted as Micropodiscus weissflogii Grunow, 1885 accepted as Conticribra weissflogii (Grunow) K.Stachura-Suchoples & D.M.Williams, 2009 † (synonym)
23. Species Thalassiosira hustedtii Poretzky & Anissimova, 1933 accepted as Thalassiosira hendeyi Hasle & G.Fryxell, 1977
24. Species Thalassiosira rotula Meunier, 1910 accepted as Thalassiosira gravida Cleve, 1896 (unaccepted > junior subjective synonym)
25. Species Thalassiosira oestrupii (Ostenfeld) Hasle, 1972 represented as Shionodiscus oestrupii (Ostenfeld) A.J.Alverson, S.H.Kang & E.C.Theriot, 2006
26. Species Thalassiosira aculeata Proshkina-Lavrenko, 1956 (uncertain > unassessed)
27. Species Thalassiosira adeliae Manguin, 1957 (uncertain > unassessed)
28. Species Thalassiosira aestivalis Gran, 1931 (uncertain > unassessed)
29. Species Thalassiosira allenii Takano, 1965 (uncertain > unassessed)
30. Species Thalassiosira ambigua O.G.Kozlova, 1962 (uncertain > unassessed)
31. Species Thalassiosira andamanica A.D.Gedde, 1999 (uncertain > unassessed)
32. Species Thalassiosira angstii (Gran) Makarova, 1971 accepted as Coscinodiscus angstii var. angstii Gran in Gran & Angst, 1931 (uncertain > unassessed)
33. Species Thalassiosira angulata (W.Gregory) Hasle, 1978 accepted as Orthosira angulata Gregory, 1857 (uncertain > unassessed)
34. Species Thalassiosira anguste-lineata (A.Schmidt) G.Fryxell & Hasle, 1977 accepted as Coscinodiscus angustelineatus Schmidt in Schmidt et al., 1878 (uncertain > unassessed)
35. Species Thalassiosira antarctica Comber, 1896 (uncertain > unassessed)
36. Species Thalassiosira antarctica Karsten, 1905 (uncertain > unassessed)
37. Species Thalassiosira australiensis (Grunow) Hasle in Hasle & Lange, 1989 accepted as Coscinodiscus australiensis Grunow, 1884 (uncertain > unassessed)
38. Species Thalassiosira australis M.Peragallo, 1921 (uncertain > unassessed)
39. Species Thalassiosira baldaufii Boden, 1993 (uncertain > unassessed)
40. Species Thalassiosira binata Fryxell, 1977 (uncertain > unassessed)
41. Species Thalassiosira bingensis Takano, 1980 (uncertain > unassessed)
42. Species Thalassiosira bipartita (Rattray) Hallegraeff, 1992 accepted as Coscinodiscus bipartitus Rattray, 1890 (uncertain > unassessed)
43. Species Thalassiosira bipora M. Shiono, 2000 (uncertain > unassessed)
44. Species Thalassiosira brunii Akiba & Yangisawa, 1985 (uncertain > unassessed)
45. Species Thalassiosira bulbosa Syvertsen in Syvertsen & Hasle, 1984 (uncertain > unassessed)
46. Species Thalassiosira bungerensis R.M. Gogorev & Z.V. Pushina in Gogorev et al., 2010 (uncertain > unassessed)
47. Species Thalassiosira burckliana Schrader, 1974 (uncertain > unassessed)
48. Species Thalassiosira californica Tanimura, 1996 (uncertain > unassessed)
49. Species Thalassiosira cardiophora Round, 1988 (uncertain > unassessed)
50. Species Thalassiosira cedarkeyensis A.K.S.K.Prasad, 1993 (uncertain > unassessed)
51. Species Thalassiosira centra M. Shiono, 2000 (uncertain > unassessed)
52. Species Thalassiosira chilensis Krasske, 1941 (uncertain > unassessed)
53. Species Thalassiosira complicata Gersonde, 1991 (uncertain > unassessed)
54. Species Thalassiosira concaviuscula I.V.Makarova, 1978 (uncertain > unassessed)
55. Species Thalassiosira condensata Cleve, 1900 (uncertain > unassessed)
56. Species Thalassiosira conferta Hasle, 1977 (uncertain > unassessed)
57. Species Thalassiosira confusa Makarova, 1975 (uncertain > unassessed)
58. Species Thalassiosira constricta Gaarder, 1938 accepted as Bacterosira constricta (Gaarder, 1938) J.S. Park & J.H. Lee, 2016 (uncertain > unassessed)
59. Species Thalassiosira convexa V.V.Muchina, 1965 (uncertain > unassessed)
60. Species Thalassiosira coronata Gaarder, 1951 (uncertain > unassessed)
61. Species Thalassiosira coronifera Proschkina-Lavrenko, 1961 (uncertain > unassessed)
62. Species Thalassiosira curviseriata Takano, 1981 (uncertain > unassessed)
63. Species Thalassiosira delicata (Barron) Akiba, 1985 accepted as Thalassiosira nidulus var. delicata Barron, 1980 (uncertain > unassessed)
64. Species Thalassiosira delicatula Hustedt, 1958 (uncertain > unassessed)
65. Species Thalassiosira delicatula Ostenfeld, 1908 (uncertain > unassessed)
66. Species Thalassiosira densannula Hasle & Fryxell, 1977 (uncertain > unassessed)
67. Species Thalassiosira dichotomica (O.G.Kozlova) G.A.Fryxell & G.R.Hasle, 1983 accepted as Porosira dichotomica O.G.Kozlova, 1962 (uncertain > unassessed)
68. Species Thalassiosira diporocyclus Hasle, 1972 (uncertain > unassessed)
69. Species Thalassiosira dubia Kozlova, 1962 (uncertain > unassessed)
70. Species Thalassiosira dubia Leuduger-Fortmorel, 1892 (uncertain > unassessed)
71. Species Thalassiosira dubiosa Schrader in Schrader & Fenner, 1976 (uncertain > unassessed)
72. Species Thalassiosira duostra C.Pienaar, 1990 (uncertain > unassessed)
73. Species Thalassiosira eccentrica (Ehrenberg) Cleve, 1904 (uncertain > unassessed)
74. Species Thalassiosira echinata Semina in Semina & Fryxell, 1994 (uncertain > unassessed)
75. Species Thalassiosira elliptipora (Donahue) Fenner, 1991 (uncertain > unassessed)
76. Species Thalassiosira elsayedii Fryxell, 1975 (uncertain > unassessed)
77. Species Thalassiosira endoseriata Hasle & G.Fryxell, 1977 (uncertain > unassessed)
78. Species Thalassiosira exceptiuncula Shiono (uncertain > unassessed)
79. Species Thalassiosira exigua G.Fryxell & Hasle, 1977 (uncertain > unassessed)
80. Species Thalassiosira expecta VanLandingham, 1978 (uncertain > unassessed)
81. Species Thalassiosira fallax Meunier, 1910 (uncertain > unassessed)
82. Species Thalassiosira fasciculata Harwood & Maruyama, 1992 (uncertain > unassessed)
83. Species Thalassiosira ferelineata Hasle & G.A.Fryxell, 1977 (uncertain > unassessed)
84. Species Thalassiosira floridana (I.C.G.Cooper) Hasle, 1972 accepted as Coscinosira floridana I.C.G.Cooper, 1958 (uncertain > unassessed)
85. Species Thalassiosira fraga Schrader in Schrader & Fenner, 1976 (uncertain > unassessed)
86. Species Thalassiosira fragilis G. Fryxell in Fryxell, Gould & Watkins, 1984 (uncertain > unassessed)
87. Species Thalassiosira frenguellii O.G.Kozlova, 1964 (uncertain > unassessed)
88. Species Thalassiosira frenguelliopsis G.A.Fryxell & J.R.Johans, 1985 (uncertain > unassessed)
89. Species Thalassiosira gelatinosa Hensen, 1887 (uncertain > unassessed)
90. Species Thalassiosira gersondei Barron in Baldauf & Barron, 1991 (uncertain > unassessed)
91. Species Thalassiosira gracilis (Karsten) Hustedt, 1958 accepted as Coscinodiscus gracilis Karsten, 1905 (uncertain > unassessed)
92. Species Thalassiosira grunowii Akiba & Yanagisawa, 1985 (uncertain > unassessed)
93. Species Thalassiosira guillardii Hasle, 1978 (uncertain > unassessed)
94. Species Thalassiosira hasleae Cassie & Dempsey, 1980 (uncertain > unassessed)
95. Species Thalassiosira hendeyi Hasle & G.Fryxell, 1977 (uncertain > unassessed)
96. Species Thalassiosira hibernalis Gayoso, 1989 (uncertain > unassessed)
97. Species Thalassiosira hispida Syvertsen, 1986 (uncertain > unassessed)
98. Species Thalassiosira hydra Gombos in Gombos & Ciesielski, 1983 (uncertain > unassessed)
99. Species Thalassiosira ignota Makarova, 1975 (uncertain > unassessed)
100. Species Thalassiosira insigna (Jousé) Harwood & Maruyama, 1992 accepted as Actinocyclus complanatus var. complanatus Castracane, 1886 (uncertain > unassessed)
101. Species Thalassiosira intrannula Herzig & Fryxell, 1986 (uncertain > unassessed)
102. Species Thalassiosira inura Gersonde, 1991 (uncertain > unassessed)
103. Species Thalassiosira irregulata Schrader in Schrader & Fenner, 1976 (uncertain > unassessed)
104. Species Thalassiosira japonica Kisselev, 1935 (uncertain > unassessed)
105. Species Thalassiosira jouseae Akiba, 1985 (uncertain > unassessed)
106. Species Thalassiosira kanayae Tanimura, 1996 (uncertain > unassessed)
107. Species Thalassiosira kolbei (Jousé) Gersonde, 1990 accepted as Coscinodiscus kolbei A.P.Jousé, 1965 (uncertain > unassessed)
108. Species Thalassiosira kozlovii Makarova, 1971 (uncertain > unassessed)
109. Species Thalassiosira kryophila (Grunow) E.Jørgensen, 1905 accepted as Coscinodiscus kryophilus Grunow, 1884 (uncertain > unassessed)
110. Species Thalassiosira kushirensis Takano, 1985 (uncertain > unassessed)
111. Species Thalassiosira labimarginata Bodén, 1993 (uncertain > unassessed)
112. Species Thalassiosira latimarginata Makarova, 1975 (uncertain > unassessed)
113. Species Thalassiosira lentiginosa (Janisch) Fryxell, 1977 accepted as Coscinodiscus lentiginosus var. lentiginosus Janisch in Schmidt et al., 1878 (uncertain > unassessed)
114. Species Thalassiosira leptopus (Grunow ex Van Heurck) Hasle & G.Fryxell, 1977 (uncertain > unassessed)
115. Species Thalassiosira levanderi van Goor, 1924 (uncertain > unassessed)
116. Species Thalassiosira licea G.Fryxell, 1978 (uncertain > unassessed)
117. Species Thalassiosira lineata Jousé, 1968 (uncertain > unassessed)
118. Species Thalassiosira lineoides Herzig & Fryxell, 1986 (uncertain > unassessed)
119. Species Thalassiosira lundiana Fryxell, 1975 (uncertain > unassessed)
120. Species Thalassiosira lusca Schrader in Schrader & Fenner, 1976 (uncertain > unassessed)
121. Species Thalassiosira maculata G.A.Fryxell & J.R.Johansen, 1985 (uncertain > unassessed)
122. Species Thalassiosira mahoodii Barron in Baldauf & Barron, 1991 (uncertain > unassessed)
123. Species Thalassiosira makarovae Mukhina, 1978 (uncertain > unassessed)
124. Species Thalassiosira mala Takano, 1965 (uncertain > unassessed)
125. Species Thalassiosira margaritae (Frenguelli & Orlando) O.G.Kozlova, 1962 accepted as Coscinodiscus margaritae Frenguelli & Orlando, 1958 (uncertain > unassessed)
126. Species Thalassiosira mediaconvexa Schrader in Schrader & Fenner, 1976 (uncertain > unassessed)
127. Species Thalassiosira mediterranea (Schröder) Hasle, 1972 accepted as Coscinosira mediterranea Schröder, 1911 (uncertain > unassessed)
128. Species Thalassiosira mendiolana Hasle & Heimdal, 1970 (uncertain > unassessed)
129. Species Thalassiosira minima Gaarder, 1951 (uncertain > unassessed)
130. Species Thalassiosira miocenica Schrader, 1974 (uncertain > unassessed)
131. Species Thalassiosira mioplicata Akiba & Yanagisawa, 1985 (uncertain > unassessed)
132. Species Thalassiosira mirniae Jousé, 1962 (uncertain > unassessed)
133. Species Thalassiosira moholensis (Schrader) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus moholensis Schrader, 1974 (uncertain > unassessed)
134. Species Thalassiosira monoporocyclus Hasle, 1972 (uncertain > unassessed)
135. Species Thalassiosira multipora Whiting & Schrader, 1985 (uncertain > unassessed)
136. Species Thalassiosira nana Lohmann, 1908 (uncertain > unassessed)
137. Species Thalassiosira nanolineata (A.Mann) Fryxell & Hasle, 1977 accepted as Coscinodiscus nanolineatus Mann, 1925 (uncertain > unassessed)
138. Species Thalassiosira nativa Sheshukova-Poretskaya, 1964 (uncertain > unassessed)
139. Species Thalassiosira nevadica Khursevich & Van Landingham, 1993 (uncertain > unassessed)
140. Species Thalassiosira nidulus (Tempère & Brun in Brun & Tempère) Jousé, 1961 accepted as Stephanopyxis nidulus Tempère & Brun in Brun & Tempère, 1889 (uncertain > unassessed)
141. Species Thalassiosira nodulolineata (Hendey) Hasle & Fryxell, 1977 accepted as Coscinodiscus nodulolineatus Hendey, 1958 (uncertain > unassessed)
142. Species Thalassiosira obica Kozlova, 1967 (uncertain > unassessed)
143. Species Thalassiosira oceanica Hasle, 1983 (uncertain > unassessed)
144. Species Thalassiosira oliveriana (O'Meara) I.V.Makarova & V.A.Nikolajev, 1983 (uncertain > unassessed)
145. Species Thalassiosira oranica Hasle, 1985 (uncertain > unassessed)
146. Species Thalassiosira ornata Proshkina-Lavrenko, 1959 (uncertain > unassessed)
147. Species Thalassiosira pacifica Gran & Angst, 1931 (uncertain > unassessed)
148. Species Thalassiosira partheneia Schrader, 1972 (uncertain > unassessed)
149. Species Thalassiosira parva Proschkina-Lavrenko, 1955 (uncertain > unassessed)
150. Species Thalassiosira perispinosa Tanimura, 1996 (uncertain > unassessed)
151. Species Thalassiosira perpusilla Kozlova, 1967 (uncertain > unassessed)
152. Species Thalassiosira planiuscula (Rattray) D.M. Harwood & T. Maruyama, 1992 accepted as Coscinodiscus planiusculus Rattray, 1890 (uncertain > unassessed)
153. Species Thalassiosira plicata Schrader, 1974 (uncertain > unassessed)
154. Species Thalassiosira plicatoides (Simonsen) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus plicatoides Simonsen, 1974 (uncertain > unassessed)
155. Species Thalassiosira polychorda (Gran) E.Jorgensen, 1899 accepted as Coscinodiscus polychordus Gran, 1897 (uncertain > unassessed)
156. Species Thalassiosira poro-irregulata Hasle & Heimdal, 1970 (uncertain > unassessed)
157. Species Thalassiosira praenidulus Akiba, 1985 (uncertain > unassessed)
158. Species Thalassiosira praeyabei (Schrader) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus praeyabei Schrader, 1973 (uncertain > unassessed)
159. Species Thalassiosira primalabiata Gombos in Gombos & Ciesielski, 1983 (uncertain > unassessed)
160. Species Thalassiosira proschkinae Makarova, 1979 (uncertain > unassessed)
161. Species Thalassiosira pseudonana Hasle & Heimdal, 1970 (uncertain > unassessed)
162. Species Thalassiosira punctifera (Grunow) Fryxell, Simonsen & Hasle, 1974 accepted as Coscinodiscus excentricus var. punctifera Grunow, 1884 (uncertain > unassessed)
163. Species Thalassiosira punctigera (Castracane) Hasle, 1983 accepted as Ethmodiscus punctiger Castracane, 1886 (uncertain > unassessed)
164. Species Thalassiosira ritscheri (Hustedt) Hasle, 1970 accepted as Coscinodiscus ritscheri Hustedt, 1958 (uncertain > unassessed)
165. Species Thalassiosira rosulata Takano, 1985 (uncertain > unassessed)
166. Species Thalassiosira sackettii G. Fryxell, 1977 (uncertain > unassessed)
167. Species Thalassiosira sancettae Akiba, 1985 (uncertain > unassessed)
168. Species Thalassiosira scotia Fryxell & Hoban, 1979 (uncertain > unassessed)
169. Species Thalassiosira simonsenii Hasle & G.Fryxell, 1977 (uncertain > unassessed)
170. Species Thalassiosira solitaria Gayoso, 1985 (uncertain > unassessed)
171. Species Thalassiosira spicula Kozlova, 1967 (uncertain > unassessed)
172. Species Thalassiosira spinosa H.J.Schrader, 1976 (uncertain > unassessed)
173. Species Thalassiosira spinulata Takano, 1981 (uncertain > unassessed)
174. Species Thalassiosira striata Harwood & Maruyama, 1992 (uncertain > unassessed)
175. Species Thalassiosira subsalina Proshkina-Lavrenko, 1955 (uncertain > unassessed)
176. Species Thalassiosira subtilis (Ostenfeld) Gran, 1900 (uncertain > unassessed)
177. Species Thalassiosira symbolophora Schrader, 1974 (uncertain > unassessed)
178. Species Thalassiosira symmetrica G.A.Fryxell & Hasle, 1973 (uncertain > unassessed)
179. Species Thalassiosira tcherniai Manguin, 1957 (uncertain > unassessed)
180. Species Thalassiosira tealata Takano, 1980 (uncertain > unassessed)
181. Species Thalassiosira temperei (Brun) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus temperei Brun in Brun & Tempère, 1889 (uncertain > unassessed)
182. Species Thalassiosira tenera Proschkina-Lavrenko, 1961 (uncertain > unassessed)
183. Species Thalassiosira thailandica Boonyapiwat in Boonyapiwat & Takano, 1986 (uncertain > unassessed)
184. Species Thalassiosira transitoria Tanimura, 1996 (uncertain > unassessed)
185. Species Thalassiosira trifulta G.Fryxell, 1979 (uncertain > unassessed)
186. Species Thalassiosira tubifera Fryxell, 1975 (uncertain > unassessed)
187. Species Thalassiosira tumida (Janisch) Hasle, 1971 accepted as Coscinodiscus tumidus var. tumidus Janisch in Schmidt et al., 1878 (uncertain > unassessed)
188. Species Thalassiosira ulna Kozlova, 1967 (uncertain > unassessed)
189. Species Thalassiosira umaoiensis Akiba, 1985 (uncertain > unassessed)
190. Species Thalassiosira urahoroensis Akiba, 1985 (uncertain > unassessed)
191. Species Thalassiosira visurgis Hustedt, 1957 (uncertain > unassessed)
192. Species Thalassiosira voeringensis Bodén, 1992 (uncertain > unassessed)
193. Species Thalassiosira vulnifica (Gombos) Fenner amend Mahood & Barron, 1996 accepted as Coscinodiscus vulnificus Gombos, 1976 (uncertain > unassessed)
194. Species Thalassiosira weissflogii (Grunow) G.Fryxell & Hasle, 1977 accepted as Micropodiscus weissflogii Grunow, 1885 accepted as Conticribra weissflogii (Grunow) K.Stachura-Suchoples & D.M.Williams, 2009 † (uncertain > unassessed)
195. Species Thalassiosira yabei (Kanaya) Akiba & Yanagisawa, 1985 accepted as Coscinodiscus yabei Kanaya, 1959 (uncertain > unassessed)

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