1. Species Gymnodinium abbreviatum Kofoid & Swezy, 1921
2. Species Gymnodinium achromaticum Lebour, 1917
3. Species Gymnodinium acutissimum Okolodkov, 1997
4. Species Gymnodinium acutiusculum Okolodkov, 1997
5. Species Gymnodinium adriaticum (Schmarda) Kofoid & Swezy, 1921
6. Species Gymnodinium aequatoriale Hasle, 1960
7. Species Gymnodinium agaricoides P.H.Campbell, 1973
8. Species Gymnodinium agiliforme Schiller, 1928
9. Species Gymnodinium albidum J.B.Lackey & E.W.Lackey, 1970
10. Species Gymnodinium albulum Er.Lindemann, 1928
11. Species Gymnodinium allophron J.Larsen, 1994
12. Species Gymnodinium amphityphlum J.Larsen, 1994
13. Species Gymnodinium amphora Kofoid & Swezy, 1921
14. Species Gymnodinium amplinucleum P.H.Campbell, 1973
15. Species Gymnodinium antarcticum A.E.Thessen, D.J.Patterson & S.A.Murray, 2012
16. Species Gymnodinium arcticum Wulff, 1919
17. Species Gymnodinium arcuatum Kofoid, 1931
18. Species Gymnodinium arenicola Dragesco, 1965
19. Species Gymnodinium atomatum J.Larsen, 1994
20. Species Gymnodinium attenuatum Kofoid & Swezy, 1921
21. Species Gymnodinium aurantium P.H.Campbell, 1973
22. Species Gymnodinium auratum Kofoid & Swezy, 1921
23. Species Gymnodinium aureolum (E.M.Hulburt) Gert Hansen, 2000
24. Species Gymnodinium aureum Kofoid & Swezy, 1921
25. Species Gymnodinium australense Ruiner, 1938
26. Species Gymnodinium baccatum Balech, 1965
27. Species Gymnodinium bicaudatum Pavillard, 1905
28. Species Gymnodinium biconicum J.Schiller, 1928
29. Species Gymnodinium bicorne Kofoid & Swezy, 1921
30. Species Gymnodinium bifurcatum Kofoid & Swezy, 1921
31. Species Gymnodinium bilobatum Van Meel, 1969
32. Species Gymnodinium birotundatum van Goor, 1925
33. Species Gymnodinium boguense P.H.Campbell, 1973
34. Species Gymnodinium boguensis P.H.Campbell, 1973
35. Species Gymnodinium bonaerense Akselman, 1985
36. Species Gymnodinium boreale Gaarder, 1953
37. Species Gymnodinium canus Kofoid & Swezy, 1921
38. Species Gymnodinium capitatum Conrad & Kufferath, 1954
39. Species Gymnodinium caput J.Schiller, 1928
40. Species Gymnodinium cassieorum R.E.Norris, 1961
41. Species Gymnodinium catenatum H.W.Graham, 1943
42. Species Gymnodinium chiasmonetrium Norris, 1961
43. Species Gymnodinium chukwanii D.Ballantine, 1961
44. Species Gymnodinium cinctum Kofoid & Swezy, 1921
45. Species Gymnodinium cnodax Conrad & Kufferath, 1954
46. Species Gymnodinium contractum Kofoid & Swezy, 1921
47. Species Gymnodinium corii J.Schiller, 1928
48. Species Gymnodinium corollarium A.M.Sundström, Kremp & Daugbjerg, 2009
49. Species Gymnodinium costatum Kofoid & Swezy, 1921
50. Species Gymnodinium cruciatum J.Massart
51. Species Gymnodinium cucumis Schütt, 1895
52. Species Gymnodinium cyaneofungiforme Conrad & Kufferath, 1954
53. Species Gymnodinium danicans P.H.Campbell, 1973
54. Species Gymnodinium dentatum J.Larsen, 1994
55. Species Gymnodinium diamphidium R.E.Norris, 1961
56. Species Gymnodinium diploconus Schütt, 1895
57. Species Gymnodinium dissimile Kofoid & Swezy, 1921
58. Species Gymnodinium dogielii Kofoid & Swezy, 1921
59. Species Gymnodinium doma Kofoid & Swezy, 1921
60. Species Gymnodinium dorsalisulcum (Hulbert, J.J.A.McLaughlin & Zahl) Shauna Murray, Salas & Hallegraeff, 2007
61. Species Gymnodinium elongatum B.Hope, 1954
62. Species Gymnodinium endofasciculum P.H.Campbell, 1973
63. Species Gymnodinium enorme Ballantine, 1964
64. Species Gymnodinium exechegloutum R.E.Norris, 1961
65. Species Gymnodinium filum Lebour, 1917
66. Species Gymnodinium flavum Kofoid & Swezy, 1921
67. Species Gymnodinium fossarum Conrad & Kufferath, 1954
68. Species Gymnodinium fukushimae Hada, 1966
69. Species Gymnodinium fulgens Kofoid & Swezy, 1921
70. Species Gymnodinium fuscum (Ehrenberg) F.Stein, 1878
71. Species Gymnodinium fusiforme Kofoid & Swezy, 1921
72. Species Gymnodinium fusus Schütt, 1896
73. Species Gymnodinium galaeformis Matzenauer, 1933
74. Species Gymnodinium galeaeforme Matzenauer, 1933
75. Species Gymnodinium galeatum J.Larsen, 1994
76. Species Gymnodinium galeiforme Okolodkov, 1997
77. Species Gymnodinium galesianum P.H.Campbell, 1973
78. Species Gymnodinium gelbum Kofoid, 1931
79. Species Gymnodinium gibbera J.Schiller, 1928
80. Species Gymnodinium glandiforme Conrad & Kufferath, 1954
81. Species Gymnodinium gleba Schütt, 1895
82. Species Gymnodinium gracilentum P.H.Campbell, 1973
83. Species Gymnodinium grammaticum (Pouchet) Kofoid & Swezy, 1921
84. Species Gymnodinium guttiforme J.Larsen, 1994
85. Species Gymnodinium guttula Balech, 1976
86. Species Gymnodinium hamulus Kofoid & Swezy, 1921
87. Species Gymnodinium herbaceum Kofoid, 1921
88. Species Gymnodinium heterostriatum Kofoid & Swezy, 1921
89. Species Gymnodinium hiroshimaense Hada, 1968
90. Species Gymnodinium hulburtii P.H.Campbell, 1973
91. Species Gymnodinium impudicum (S.Fraga & I.Bravo) Gert Hansen & Moestrup, 2000
92. Species Gymnodinium incertum E.C.Herdman, 1924
93. Species Gymnodinium incisum Kofoid & Swezy, 1921
94. Species Gymnodinium incoloratum Conrad & Kufferath, 1954
95. Species Gymnodinium inconstans van Meel, 1969
96. Species Gymnodinium intercalare Bursa, 1961
97. Species Gymnodinium inusitatum H.Gu, 2013
98. Species Gymnodinium irregulare B.Hope, 1954
99. Species Gymnodinium japonicum Hada, 1974
100. Species Gymnodinium katodiniforme Elbrachter, 1979
101. Species Gymnodinium kesslitzii (J.Schiller) Moestrup, 2018
102. Species Gymnodinium kowalevskii Pitzik, 1967
103. Species Gymnodinium lachmannii Kent, 1881
104. Species Gymnodinium lanskoi Rouchijajnen, 1968
105. Species Gymnodinium lazulum Hulburt, 1957
106. Species Gymnodinium leptum R.E.Norris, 1961
107. Species Gymnodinium lineatum Kofoid & Swezy, 1921
108. Species Gymnodinium lineopunicum Kofoid & Swezy, 1921
109. Species Gymnodinium litoralis A.Reñé, 2011
110. Species Gymnodinium lobularis P.H.Campbell, 1973
111. Species Gymnodinium loburare P.H.Campbell, 1973
112. Species Gymnodinium lucidum D.Ballantine, 1964
113. Species Gymnodinium luteo-viride van Meel, 1969
114. Species Gymnodinium maguelonnense Biecheler, 1952
115. Species Gymnodinium mammosum van Meel, 1969
116. Species Gymnodinium marinum Kent, 1880
117. Species Gymnodinium massarti J.Schiller, 1932
118. Species Gymnodinium maximum Nordli, 1951
119. Species Gymnodinium metum Hulburt, 1957
120. Species Gymnodinium microreticulatum C.J.S.Bolch, Negri & G.M.Hallegraeff, 1999
121. Species Gymnodinium minor Lebour, 1917
122. Species Gymnodinium minus Lebour, 1917
123. Species Gymnodinium minutulum J.Larsen, 1994
124. Species Gymnodinium modestum Balech, 1976
125. Species Gymnodinium multilineatum Kofoid & Swezy, 1921
126. Species Gymnodinium multistriatum Kofoid & Swezy, 1921
127. Species Gymnodinium najadeum J.Schiller, 1928
128. Species Gymnodinium nanum Schiller, 1928
129. Species Gymnodinium neapolitanum J.Schiller, 1928
130. Species Gymnodinium nolleri M.Ellegaard & Ø.Moestrup, 1999
131. Species Gymnodinium nucaceum Okolodkov, 1997
132. Species Gymnodinium obliquum Okolodkov, 1997
133. Species Gymnodinium oceanicum Hasle, 1960
134. Species Gymnodinium ochraceum Kofoid, 1931
135. Species Gymnodinium octo J.Larsen, 1994
136. Species Gymnodinium oppressum Conrad, 1926
137. Species Gymnodinium opressum Conrad, 1926
138. Species Gymnodinium ostenfeldii J.Schiller, 1928
139. Species Gymnodinium ovatocapitatum Van Meel, 1969
140. Species Gymnodinium ovoideum Okolodkov, 1997
141. Species Gymnodinium ovulum Kofoid & Swezy, 1921
142. Species Gymnodinium pallidum Skuja, 1939
143. Species Gymnodinium parvum J.Larsen, 1994
144. Species Gymnodinium patagonicum Balech, 1971
145. Species Gymnodinium paulseinii Schiller
146. Species Gymnodinium paulsenii J.Schiller, 1928
147. Species Gymnodinium perplexum van Meel, 1969
148. Species Gymnodinium pingue van Meel, 1969
149. Species Gymnodinium placidum E.C.Herdman, 1922
150. Species Gymnodinium polycomma J.Larsen, 1994
151. Species Gymnodinium prolatum J.Larsen, 1994
152. Species Gymnodinium pulchrum J.Schiller, 1928
153. Species Gymnodinium pumilum J.Larsen, 1994
154. Species Gymnodinium punctatum Pouchet, 1887
155. Species Gymnodinium puniceum Kofoid & Swezy, 1921
156. Species Gymnodinium purpureum Skuja, 1956
157. Species Gymnodinium pygmaeum Lebour, 1925
158. Species Gymnodinium pyrenoidosum T.Horiguchi & Chihara, 1988
159. Species Gymnodinium radiatum Kofoid & Swezy, 1921
160. Species Gymnodinium ravenescens Kofoid & Swezy, 1921
161. Species Gymnodinium regulare van Meel, 1969
162. Species Gymnodinium rete Schutt, 1895
163. Species Gymnodinium rhomboides Schütt, 1895
164. Species Gymnodinium roseostigma P.H.Campbell, 1973
165. Species Gymnodinium rubricauda Kofoid & Swezy, 1921
166. Species Gymnodinium rubrocinctum Lebour, 1925
167. Species Gymnodinium rubrum Koifoid & Swezy, 1921
168. Species Gymnodinium scaphium van Meel, 1969
169. Species Gymnodinium schaefferi S.Morris, 1937
170. Species Gymnodinium scopulosum Kofoid & Swezy, 1921
171. Species Gymnodinium semidivisum J.Schiller, 1928
172. Species Gymnodinium servatum W.Busch, 1927
173. Species Gymnodinium situla Kofoid & Swezy, 1921
174. Species Gymnodinium smaydae N.S.Kang, H.J.Jeong & Ø. Moestrup., 2014
175. Species Gymnodinium soyai Hada, 1970
176. Species Gymnodinium sphaericum (Calkins) Kofoid & Swezy, 1921
177. Species Gymnodinium sphaeroideum Kofoid, 1931
178. Species Gymnodinium stellatum Hulburt, 1957
179. Species Gymnodinium striassimum Hulbert
180. Species Gymnodinium subroseum P.H.Campbell, 1973
181. Species Gymnodinium subrufescens G.W.Martin, 1929
182. Species Gymnodinium suffuscum van Meel, 1969
183. Species Gymnodinium sulcatum Kofoid & Swezy, 1921
184. Species Gymnodinium telma van Meel, 1969
185. Species Gymnodinium translucens Kofoid & Swezy, 1921
186. Species Gymnodinium translucens P.H.Campbell, 1973
187. Species Gymnodinium trapeziforme Attaran-Fariman & Bolch, 2007
188. Species Gymnodinium triangularis Lebour, 1917
189. Species Gymnodinium uberrimum (G.J.Allman) Kofoid & Swezy, 1921
190. Species Gymnodinium valdecompressum P.H.Campbell, 1973
191. Species Gymnodinium variabile E.C.Herdman, 1924
192. Species Gymnodinium vas Van Meel, 1969
193. Species Gymnodinium venator Flo Jørgensen & Murray, 2004
194. Species Gymnodinium verruculosum P.H.Campbell, 1973
195. Species Gymnodinium violescens Kofoid & Swezy, 1921
196. Species Gymnodinium virescens Wood, 1963
197. Species Gymnodinium viridaliut J.Schiller, 1955
198. Species Gymnodinium viridans van Meel, 1969
199. Species Gymnodinium viridescens Kofoid, 1931
200. Species Gymnodinium voukii J.Schiller, 1928
201. Species Gymnodinium wilczekii Pouchet, 1894
202. Species Gymnodinium wulffii J.Schiller, 1933
203. Species Gymnodinium acutiusclum Okolodkov, 1997 accepted as Gymnodinium acutiusculum Okolodkov, 1997
204. Species Gymnodinium affine Dogiel, 1906 accepted as Chytriodinium affine (Dogiel) Chatton, 1920
205. Species Gymnodinium agile Kofoid & Swezy, 1921 accepted as Durinskia agilis (Kofoid & Swezy) Saburova, Chomérat & Hoppenrath, 2012 (synonym)
206. Species Gymnodinium agile Herdman, 1922 accepted as Herdmania litoralis J.D.Dodge, 1981 (synonym)
207. Species Gymnodinium archimedis Pouchet, 1883 accepted as Cochlodinium archimedes (Pouchet) Lemmermann, 1899 (synonym)
208. Species Gymnodinium arenicolum Dragesco, 1965 accepted as Gymnodinium arenicola Dragesco, 1965
209. Species Gymnodinium asymmetricum Massart, 1920 accepted as Katodinium asymmetricum (Massart) A.R.Loeblich, III, 1965 (synonym)
210. Species Gymnodinium bei H.J.Spero, 1987 accepted as Pelagodinium bei (H.J.Spero) Siano, Montresor, Probert & Vargas, 2010 (deleted in Algaebase)
211. Species Gymnodinium breve C.C.Davis, 1948 accepted as Karenia brevis (C.C.Davis) Gert Hansen & Moestrup, 2000 (basionym)
212. Species Gymnodinium brevisulcatum F.H.Chang, 1999 accepted as Karenia brevisulcata (F.H.Chang) Gert Hansen & Moestrup, 2000 (basionym)
213. Species Gymnodinium chlorophorum Elbrächter & Schnepf, 1996 accepted as Lepidodinium chlorophorum (M.Elbrächter & E.Schnepf) Gert Hansen, Botes & Salas, 2007 (synonym)
214. Species Gymnodinium coeruleum Dogiel, 1906 accepted as Balechina coerulea (Dogiel) F.J.R.Taylor, 1976 accepted as Cucumeridinium coeruleum (Dogiel) F.Gomez, P.López-García, H.Takayama & D.Moreira, 2015 (synonym)
215. Species Gymnodinium conicum Kofoid & Swezy, 1921 accepted as Spatulodinium pseudonoctiluca (Pouchet) J.Cachon & M.Cachon, 1968 (synonym)
216. Species Gymnodinium fissum Levander, 1894 accepted as Levanderina fissa (Levander) Moestrup, Hakanen, Gert Hansen, Daugbjerg & M.Ellegaard, 2014 (basionym)
217. Species Gymnodinium frigidum Balech, 1965 accepted as Gymnodinium antarcticum A.E.Thessen, D.J.Patterson & S.A.Murray, 2012
218. Species Gymnodinium fungiforme Anisimova, 1926 accepted as Speroidium fungiforme (Anisimova) Moestrup & Calado, 2018
219. Species Gymnodinium galatheanum Braarud, 1957 accepted as Karlodinium veneficum (D.Ballantine) J.Larsen, 2000 (synonym)
220. Species Gymnodinium geminatum Schütt, 1895 accepted as Cochlodinium geminatum (Schütt) Schütt, 1896 accepted as Polykrikos geminatus (Schütt) D.Qiu & S.Lin, 2013 (synonym)
221. Species Gymnodinium glandula E.C.Herdman, 1924 accepted as Aduncodinium glandula (E.C.Herdman) N.S.Kang, H.J.Jeong & Moestrup, 2015
222. Species Gymnodinium glaucum Conrad, 1926 accepted as Amphidinium conradii J.Schiller, 1932 (synonym)
223. Species Gymnodinium gracile Bergh, 1882 accepted as Balechina gracilis (Bergh) F.Gómez, Artigas & Gast, 2021
224. Species Gymnodinium halophilum Biecheler, 1952 accepted as Biecheleria halophila (Biecheler) Moestrup, Lindberg & Daugbjerg, 2009
225. Species Gymnodinium helix Pouchet, 1887 accepted as Cochlodinium helix Lemmermann, 1899 (synonym)
226. Species Gymnodinium helix Schütt, 1895 accepted as Cochlodinium helix Lemmermann, 1899 (synonym)
227. Species Gymnodinium hiemale Woloszynska, 1917 accepted as Jadwigia hiemalis (Woloszynska) Moestrup, 2018
228. Species Gymnodinium instriatum (Freudenthal & J.J.Lee) D.W.Coats, 2002 accepted as Levanderina fissa (Levander) Moestrup, Hakanen, Gert Hansen, Daugbjerg & M.Ellegaard, 2014
229. Species Gymnodinium lebourae Pavillard, 1921 accepted as Gymnodinium lebouriae Pavillard, 1921 accepted as Spatulodinium pseudonoctiluca (Pouchet) J.Cachon & M.Cachon, 1968 (misspelling)
230. Species Gymnodinium lebouriae Pavillard, 1921 accepted as Spatulodinium pseudonoctiluca (Pouchet) J.Cachon & M.Cachon, 1968
231. Species Gymnodinium leopoliensis Woloszynska, 1917 accepted as Woloszynskia leopoliensis (Woloszynska) R.H.Thompson, 1951 accepted as Tovellia leopoliensis (Woloszynska) Moestrup, K.Lindberg & Daugbjerg, 2005 (synonym)
232. Species Gymnodinium linucheae R.V.Trench & L.-V.Thinh, 1995 accepted as Symbiodinium linucheae (Trench & Thinh) T.C.LaJenesse, 2001
233. Species Gymnodinium lira Kofoid & Swezy, 1921 accepted as Cucumeridinium lira (Kofoid & Swezy) F.Gómez, P. López-García, H.Takayama & D.Moreira, 2015
234. Species Gymnodinium lohmannii Paulsen, 1908 accepted as Gymnodinium gracile Bergh, 1882 accepted as Balechina gracilis (Bergh) F.Gómez, Artigas & Gast, 2021 (synonym)
235. Species Gymnodinium lunula Schütt, 1895 accepted as Pyrocystis lunula (Schütt) Schütt, 1896 (synonym)
236. Species Gymnodinium microadriaticum (Freudenthal) F.J.R.Taylor, 1971 accepted as Symbiodinium microadriaticum LaJeunesse, 2017 (synonym)
237. Species Gymnodinium micrum (B.Leadbeater & J.D.Dodge) Loeblich III, 1970 accepted as Karlodinium veneficum (D.Ballantine) J.Larsen, 2000 (synonym)
238. Species Gymnodinium mikimotoi Miyake & Kominami ex Oda, 1935 accepted as Karenia mikimotoi (Miyake & Kominami ex Oda) Gert Hansen & Moestrup, 2000 (synonym)
239. Species Gymnodinium minutum Lebour, 1925 accepted as Heterocapsa rotundata (Lohmann) Gert Hansen, 1995 (synonym)
240. Species Gymnodinium monadicum (Deising) W.S.Kent, 1881 accepted as Gymnodinium partitum (Perty) Moestrup, 2018
241. Species Gymnodinium myriopyrenoides H.Yamaguchi, T.Nakayama, A.Kai & I.Inouye, 2011 accepted as Nusuttodinium myriopyrenoides (H.Yamaguchi, T.Nakayama, A.Kai & I.Inouye) Y.Takano & H.Yamaguichi, 2014
242. Species Gymnodinium nagasakiense H.Takayama & M.Adachi, 1985 accepted as Karenia mikimotoi (Miyake & Kominami ex Oda) Gert Hansen & Moestrup, 2000 (synonym)
243. Species Gymnodinium natalense T.Horiguchi & R.N.Pienaar, 1994 accepted as Ansanella natalensis (T.Horiguchi & R.N.Pienaar) Dawut, Sym & T.Horiguchi, 2018
244. Species Gymnodinium nelsonii G.W.Martin, 1929 accepted as Akashiwo sanguinea (K.Hirasaka) Gert Hansen & Moestrup, 2000 (synonym)
245. Species Gymnodinium ovato-capitatum van Meel, 1969 accepted as Gymnodinium ovatocapitatum Van Meel, 1969
246. Species Gymnodinium pachydermatum Kofoid & Swezy, 1921 accepted as Balechina pachydermata (Kofoid & Swezy) A.R.Loeblich Jr. & A.R.Loeblich III, 1968 accepted as Balechina gracilis (Bergh) F.Gómez, Artigas & Gast, 2021
247. Species Gymnodinium parasiticum Dogiel, 1906 accepted as Chytriodinium parasititum (Dogiel) Chatton, 1912
248. Species Gymnodinium parvulum Schütt, 1895 accepted as Gyrodinium parvulum (Schütt) Kofoid & Swezy, 1921
249. Species Gymnodinium pascheri (Suchlandt) Schiller, 1954 accepted as Borghiella pascheri (Suchlandt) Moestrup, 2018 (synonym)
250. Species Gymnodinium pellucidum Wulff, 1916 accepted as Gyrodinium pellucidum (Wulff) J.Schiller, 1933 (synonym)
251. Species Gymnodinium pellucidum (E.C.Herdman) Flø Jørgensen & Shauna Murray, 2004 accepted as Gymnodinium venator Flo Jørgensen & Murray, 2004 (synonym)
252. Species Gymnodinium pigmentosum (Dodge) Loeblich, 1970 accepted as Aureodinium pigmentosum Dodge, 1967 (synonym)
253. Species Gymnodinium pirum Schütt, 1895 accepted as Cochlodinium pirum (Schütt) Lemmermann, 1921 (synonym)
254. Species Gymnodinium polyphemus Pouchet accepted as Warnowia polyphemus (Pouchet) J.Schiller, 1933 (synonym)
255. Species Gymnodinium pouchetii Lemmermann, 1899 accepted as Oodinium pouchetii (Lemmermann) Chatton, 1912
256. Species Gymnodinium pseudonoctiluca Pouchet, 1885 accepted as Spatulodinium pseudonoctiluca (Pouchet) J.Cachon & M.Cachon, 1968 (synonym)
257. Species Gymnodinium pulchellum J.Larsen, 1994 accepted as Takayama pulchella (Larsen) de Salas, Bolch & Hallegraeff, 2003 (synonym)
258. Species Gymnodinium pyrocystis Jørgensen, 1912 accepted as Spatulodinium pseudonoctiluca (Pouchet) J.Cachon & M.Cachon, 1968 (synonym)
259. Species Gymnodinium quadrilobatum T.Horiguchi & R.N.Pienaar, 1994 accepted as Dinothrix quadrilobata (T.Horiguchi & R.N.Pienaar) R.Onuma & T.Horiguchi (unaccepted > superseded combination)
260. Species Gymnodinium roseum Dogiel, 1906 accepted as Chytriodinium roseum (Dogiel) Chatton, 1912
261. Species Gymnodinium sangineum Hirasaka, 1924 accepted as Gymnodinium sanguineum K.Hirasaka, 1922 accepted as Akashiwo sanguinea (K.Hirasaka) Gert Hansen & Moestrup, 2000
262. Species Gymnodinium sanguineum K.Hirasaka, 1922 accepted as Akashiwo sanguinea (K.Hirasaka) Gert Hansen & Moestrup, 2000 (synonym)
263. Species Gymnodinium simplex (Lohmann) Kofoid & Swezy, 1921 accepted as Protodinium simplex Lohmann, 1908
264. Species Gymnodinium spirale Bergh, 1882 accepted as Gyrodinium spirale (Bergh) Kofoid & Swezy, 1921 (synonym)
265. Species Gymnodinium splendens Lebour, 1925 accepted as Akashiwo sanguinea (K.Hirasaka) Gert Hansen & Moestrup, 2000 (basionym)
266. Species Gymnodinium strangulatum F.Schütt, 1895 accepted as Cochlodinium strangulatum (F.Schütt) F.Schütt, 1896 (synonym)
267. Species Gymnodinium striatissimum E.M.Hulburt, 1957 accepted as Gyrodinium striatissimum (E.M.Hulburt) Gert Hansen & Ø.Moestrup, 2000 (synonym)
268. Species Gymnodinium sugashimanii J.Cachon, H.Saton, M.Cachon & S.Sato, 1989 accepted as Gyrodinium sugashimanii J.Cachon, H.Saton, M.Cachon & S.Sato, 1989 (synonym)
269. Species Gymnodinium tenuissimum Lauterborn, 1894 accepted as Borghiella tenuissima (Lauterborn) Moestrup, Gert Hansen & Daugbjerg, 2008
270. Species Gymnodinium tintinnicola Lohmann, 1908 accepted as Duboscquella tintinnicola (Lohmann) Chatton
271. Species Gymnodinium uncatenatum (Hulburt) Hallegraeff, 2002 accepted as Levanderina fissa (Levander) Moestrup, Hakanen, Gert Hansen, Daugbjerg & M.Ellegaard, 2014 (synonym)
272. Species Gymnodinium veneficum D.Ballantine, 1956 accepted as Karlodinium veneficum (D.Ballantine) J.Larsen, 2000 (synonym)
273. Species Gymnodinium vestifici Schütt, 1895 accepted as Kapelodinium vestifici (Schütt) Boutrup, Moestrup & Daugbjerg, 2016
274. Species Gymnodinium viride Lebour, 1917 accepted as Gymnodinium conicum Kofoid & Swezy, 1921 accepted as Spatulodinium pseudonoctiluca (Pouchet) J.Cachon & M.Cachon, 1968 (synonym)
275. Species Gymnodinium viridis Lebour, 1917 accepted as Gymnodinium conicum Kofoid & Swezy, 1921 accepted as Spatulodinium pseudonoctiluca (Pouchet) J.Cachon & M.Cachon, 1968 (synonym)
276. Species Gymnodinium vitiligo D.Ballantine, 1956 accepted as Karlodinium vitiligo (D.Ballantine) J.Larsen, 2000 (synonym)
277. Species Gymnodinium excavatum Van Meel, 1969 (uncertain)
278. Species Gymnodinium falcatum V.G.Madhav & B.Kondalarao, 2004 (uncertain > unassessed)

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