1. Species Closterium abruptum West, 1892
2. Species Closterium acerosum Ehrenberg ex Ralfs, 1848
3. Species Closterium aciculare T.West, 1860
4. Species Closterium acuminatum Corda
5. Species Closterium acutum Brébisson, 1848
6. Species Closterium alpestre
7. Species Closterium amblyonema Ehrenberg ex J.Ralfs
8. Species Closterium amphiceps C.-C.Jao, 1949
9. Species Closterium anastomosans
10. Species Closterium anguineum D.B.Williamson, 1996
11. Species Closterium angustatum Kützing ex Ralfs, 1848
12. Species Closterium angustum Hantzsch, 1868
13. Species Closterium annandalei P.J.Brühl & K.P.Biswas, 1926
14. Species Closterium antarcticum Ehrenberg
15. Species Closterium antiacerosum De Notaris, 1867
16. Species Closterium archerianum Cleve ex P.Lundell, 1871
17. Species Closterium arcuarium E.O.Hughes, 1952
18. Species Closterium arcus A.J.Brook & D.B.Williamson, 1988
19. Species Closterium areolatum H.C.Wood, 1893
20. Species Closterium arnoldianum Y.V.Roll, 1915
21. Species Closterium atomicum M.I.Claassen, 1961
22. Species Closterium attenuatum Ralfs, 1848
23. Species Closterium auerswaldii G.L.Rabenhorst
24. Species Closterium aureum C.G.T.Preuss
25. Species Closterium bacillum Joshua, 1886
26. Species Closterium baileyanum
27. Species Closterium baillyanum (Brébisson ex Ralfs) Brébisson, 1856
28. Species Closterium balatonicum T.Hortobágyi
29. Species Closterium bandericense Petkoff
30. Species Closterium barbaricum M.I.Claassen, 1961
31. Species Closterium biclavatum Børgesen, 1891
32. Species Closterium bienense G.De Notaris
33. Species Closterium bitangchoianum J.P.Keshri & D.Das, 2016
34. Species Closterium boyanum M.I.Claasen, 1961
35. Species Closterium braunianum Reinsch
36. Species Closterium braunii Reinsch, 1867
37. Species Closterium brunelii Bourrelly, 1966
38. Species Closterium caffrorum Claassen, 1961
39. Species Closterium calosporum Wittrock, 1869
40. Species Closterium candianum G.B.Delponte
41. Species Closterium capillare Delponte, 1878
42. Species Closterium capitatum Y.V.Roll
43. Species Closterium ceratium Perty, 1852
44. Species Closterium chittagongianum A.K.M.N.Islam & Akter, 1999
45. Species Closterium clandestinum Kützing
46. Species Closterium closterioides (Ralfs) A.Louis & Peeters, 1967
47. Species Closterium closteroides (Ralfs) A.Louis & Peeters, 1967
48. Species Closterium coloratum (G.A.Klebs) R.Gutwinski
49. Species Closterium columbianum G.S.West, 1914
50. Species Closterium compactum Nordstedt, 1887
51. Species Closterium complanatum Delponte, 1877
52. Species Closterium concinnum T.Hinode
53. Species Closterium constrictum R.Gutwinski, 1902
54. Species Closterium cordanum R.Gutwinski
55. Species Closterium cornu Ehrenberg ex Ralfs, 1848
56. Species Closterium coronatum
57. Species Closterium costatosporum Taft, 1949
58. Species Closterium costatum Corda ex Ralfs, 1848
59. Species Closterium crassestriatum W.Archer, 1879
60. Species Closterium crassum Rabenhorst, 1863
61. Species Closterium croasdaleae A.K.M.N.Islam, 1971
62. Species Closterium cucumis Ehrenberg ex J.Ralfs
63. Species Closterium cucumis Ehrenberg
64. Species Closterium curtum L.A.Brébisson
65. Species Closterium curtum L.A.Brébisson ex Kützing
66. Species Closterium cylindrocystis Kützing
67. Species Closterium cymbellaeformis M.I.Claassen
68. Species Closterium cymbelliforme Claassen, 1961
69. Species Closterium cynthia De Notaris, 1867
70. Species Closterium cynthiiforme Van Westen & Coesel
71. Species Closterium cynthioides J.Sampaio
72. Species Closterium dacchense A.K.M.N.Islam, 1971
73. Species Closterium decorum Brébisson, 1856
74. Species Closterium decussatum Kützing ex Ralfs, 1848
75. Species Closterium delectum Noda & Skvortzov, 1969
76. Species Closterium delpontei (Klebs) Wolle, 1885
77. Species Closterium delpontii
78. Species Closterium dianae Ehrenberg ex Ralfs, 1848
79. Species Closterium didymocarpum Schmidle
80. Species Closterium didymocotum
81. Species Closterium didymotocum Corda ex Ralfs, 1848
82. Species Closterium dilatatum Kützing
83. Species Closterium dimoron Ehrenberg
84. Species Closterium directum W.Archer, 1862
85. Species Closterium discolor Noda & Skvortzov, 1969
86. Species Closterium diversum Noda & Skvortzov, 1969
87. Species Closterium dubium R.Gutwinski
88. Species Closterium eboracense W.B.Turner, 1887
89. Species Closterium ehrenbergii Meneghini ex Ralfs, 1848
90. Species Closterium elenkinii Kossinskaja, 1936
91. Species Closterium ensis G.B.Delponte
92. Species Closterium ensis G.W.Focke
93. Species Closterium entomon Ehrenberg
94. Species Closterium eriense Taft, 1945
95. Species Closterium evesiculatum P.W.Cook, 1963
96. Species Closterium exiguum West & G.S.West, 1902
97. Species Closterium exile West & G.S.West, 1905
98. Species Closterium fasciculatum J.P.Jacobsen
99. Species Closterium flaccidum Delponte, 1877
100. Species Closterium forte E.A.Flint & D.B.Williamson, 1998
101. Species Closterium fractum W.B.Turner
102. Species Closterium fulvum I.F.Lewis, C.Zirkle & R.Patrick, 1933
103. Species Closterium fuscum Skvortsov & Noda, 1967
104. Species Closterium fusiforme F.Gay, 1884
105. Species Closterium garoetianum C.Bernard
106. Species Closterium gracile Brébisson ex Ralfs, 1848
107. Species Closterium groenbladii Cook, 1962
108. Species Closterium guyanense (Bourrelly & Couté) Coesel, 1987
109. Species Closterium hammeri W.Archer, 1886
110. Species Closterium hantzschianum Grunow
111. Species Closterium heimerlianum (Schmidle) J.Lütkemüller
112. Species Closterium hibernicum (West) A.J.Brook & D.M.Williamson, 2010
113. Species Closterium hinganicum Noda & Skvortzov, 1969
114. Species Closterium hirudo Delponte, 1878
115. Species Closterium hunanense C.-C.Jao, 1940
116. Species Closterium hutchinsonii M.F.Rich
117. Species Closterium idiosporum West & G.S.West, 1900
118. Species Closterium inaequale Ehrenberg
119. Species Closterium inaequale Ehrenberg ex J.Ralfs
120. Species Closterium incurvum Brébisson, 1856
121. Species Closterium insolitum Claassen, 1961
122. Species Closterium intermedium Ralfs, 1848
123. Species Closterium interruptum (L.A.Brébisson) Reinsch
124. Species Closterium iuncidum
125. Species Closterium jenneri Ralfs, 1848
126. Species Closterium johnsonii West & G.S.West, 1898
127. Species Closterium joostenii Van Westen & Coesel
128. Species Closterium juncidum Ralfs, 1848
129. Species Closterium karnakense Coesel
130. Species Closterium keutzingii
131. Species Closterium khasianum W.B.Turner, 1893
132. Species Closterium knysnanum G.E.Huber-Pestalozzi
133. Species Closterium kolhapurense N.D.Kamat, 1963
134. Species Closterium kranskopense Claassen, 1961
135. Species Closterium kuetzingii Brébisson, 1856
136. Species Closterium Kützingii Bréb., 1856
137. Species Closterium lagoense Nordstedt, 1870
138. Species Closterium lanceolatum Kützing ex Ralfs, 1848
139. Species Closterium laterale Nordstedt, 1880
140. Species Closterium latiusculum Perty, 1849
141. Species Closterium leibleinii Kützing ex Ralfs, 1848
142. Species Closterium leiblenii
143. Species Closterium lemmermanni O.Zacharias
144. Species Closterium lens J.P.Jacobsen
145. Species Closterium limicum J.Sampaio
146. Species Closterium limneticum Lemmermann, 1899
147. Species Closterium lineare Nägeli
148. Species Closterium lineatum Ehrenberg ex Ralfs, 1848
149. Species Closterium lineolatum Kützing
150. Species Closterium littorale F.Gay, 1884
151. Species Closterium loktakense Brühl & Biswas, 1926
152. Species Closterium londaensis Bharati & Gonzalves, 1962
153. Species Closterium lorentzi C.Bernard
154. Species Closterium luchterianum P.Palik
155. Species Closterium lunula Ehrenberg & Hemprich ex Ralfs, 1848
156. Species Closterium macilentum Brébisson, 1856
157. Species Closterium macilientum
158. Species Closterium maculatum W.N.Hastings
159. Species Closterium magellanicum O.F.Borge
160. Species Closterium magnificum Playfair, 1907
161. Species Closterium maharastrense N.D.Kamat, 1963
162. Species Closterium malinvernianiforme Grönblad, 1920
163. Species Closterium malmei O.Borge, 1903
164. Species Closterium mamenchoanum J.P.Keshri & D.Das, 2016
165. Species Closterium manipurense Brühl & Biswas, 1926
166. Species Closterium manschuricum Skvortsov, 1926
167. Species Closterium medioleve W.Archer
168. Species Closterium methuenii F.E.Fritsch, 1914
169. Species Closterium microgranulatum H.Kufferath
170. Species Closterium minianum G.A.S.F.Sampaio
171. Species Closterium minutum Y.V.Roll, 1915
172. Species Closterium modesta Kant & P.Gupta, 1998
173. Species Closterium molle Playfair, 1907
174. Species Closterium monile L.A.Brébisson
175. Species Closterium monile L.A.Brébisson ex Kützing
176. Species Closterium moniliferum Ehrenberg ex Ralfs, 1848
177. Species Closterium monotaenium W.Archer, 1876
178. Species Closterium multistriatum F.G.Hemprich & Ehrenberg
179. Species Closterium nasutum Nordstedt ex Wolle, 1884
180. Species Closterium navicula (Brébisson) Lütkemüller, 1905
181. Species Closterium naviculoides J.N.F.Wille
182. Species Closterium nematodes Joshua, 1886
183. Species Closterium nilssonii M.Lewin, 1888
184. Species Closterium nodosum J.W.Bailey
185. Species Closterium nordstedtii Chodat, 1898
186. Species Closterium nordstedtii Gutwinski, 1902
187. Species Closterium novae-guineae C.Bernard
188. Species Closterium nylandicum (Grönblad) A.J.Brook & D.B.Williamson, 2010
189. Species Closterium obtusangulum Corda ex W.Archer, 1861
190. Species Closterium obversum K.E.Eichwald
191. Species Closterium okaritoense E.A.Flint & D.B.Williamson
192. Species Closterium okavangicum Coesel & Van Geest, 2008
193. Species Closterium oncosporum Nordstedt, 1877
194. Species Closterium pachydermum West & G.S.West, 1895
195. Species Closterium pakistanicum Masud-ul-Hassan, T.Rasool & M.Nizamuddin, 1995
196. Species Closterium paradoxum Wille, 1880
197. Species Closterium parasiticum G.G.A.Meneghini
198. Species Closterium parvulum Nägeli, 1849
199. Species Closterium pegleri F.E.Fritsch, 1921
200. Species Closterium penium Reinsch
201. Species Closterium peracerosum F.Gay, 1884
202. Species Closterium perminutum O.F.Borge
203. Species Closterium pithardianum
204. Species Closterium planum E.O.Hughes, 1952
205. Species Closterium pleurodermatum West & G.S.West, 1902
206. Species Closterium porrectum Nordstedt, 1870
207. Species Closterium portianum
208. Species Closterium praegrande Rabenhorst, 1863
209. Species Closterium praelongum Brébisson, 1856
210. Species Closterium pritchardianum W.Archer, 1862
211. Species Closterium prolongum M.F.Rich
212. Species Closterium pronum Brébisson, 1856
213. Species Closterium pseudocostatum J.Stastný & F.A.C.Kouwets, 2012
214. Species Closterium pseudocynthia J.P.Keshri & D.Das, 2016
215. Species Closterium pseudoincurvum J.P.Keshri & D.Das, 2016
216. Species Closterium pseudokuetzingii D.B.Williamson, 1996
217. Species Closterium pseudoleibleinii M.I.Claassen, 1961
218. Species Closterium pseudolunula O.Borge, 1909
219. Species Closterium pseudonasutum C.-C.Jao, 1949
220. Species Closterium pseudonitidulum Cooke, 1886
221. Species Closterium pseudopusillum Messikommer, 1956
222. Species Closterium pseudopygmaeum Kouwets, 2001
223. Species Closterium pseudospirotaenium
224. Species Closterium pseudoturgidum R.Gutwinski
225. Species Closterium pulchellum West & G.S.West, 1897
226. Species Closterium pusillum Hantzsch, 1861
227. Species Closterium pussillum
228. Species Closterium pygmaeum Gutwinski, 1890
229. Species Closterium quadrangulare Corda ex W.Archer, 1861
230. Species Closterium ralfsii Brébisson ex Ralfs, 1848
231. Species Closterium ranunculi I.F.Lewis, C.Zirkle & R.Patrick, 1933
232. Species Closterium rectimarginatum A.M.Scott & Prescott, 1961
233. Species Closterium rectum R.Gutwinski
234. Species Closterium recurvum Prescott, 1967
235. Species Closterium refractum G.B.Delponte
236. Species Closterium regulare Brébisson, 1856
237. Species Closterium reticulatum J.P.Keshri & D.Das, 2016
238. Species Closterium rostratum Ehrenberg ex Ralfs, 1848
239. Species Closterium ruficeps Ehrenberg
240. Species Closterium rugosum N.Woodhead & R.D.Tweed, 1958
241. Species Closterium schroederi J.Woloszynska
242. Species Closterium schweickerdtii Claassen, 1961
243. Species Closterium scoticum W.B.Turner, 1893
244. Species Closterium selenaeum Maskell, 1881
245. Species Closterium selenastroides Roll, 1915
246. Species Closterium semicirculare Willi Krieger & A.M.Scott, 1957
247. Species Closterium setaceum Ehrenberg ex Ralfs, 1848
248. Species Closterium sikkimicum J.P.Keshri & D.Das, 2016
249. Species Closterium siliqua West & G.S.West, 1897
250. Species Closterium sinense Lütkemüller, 1900
251. Species Closterium sinuosum D.B.Williamson
252. Species Closterium soroksariense M.Halász, 1936
253. Species Closterium spetzbergense
254. Species Closterium sphaerosporum (G.S.West) A.J.Brook, 1995
255. Species Closterium spinosporum W.Hodgetts
256. Species Closterium spirale A.K.J.Corda
257. Species Closterium spirale Corda
258. Species Closterium spiraliferum J.P.Jacobsen
259. Species Closterium spiraliforme Schroeder
260. Species Closterium squamatum Ehrenberg
261. Species Closterium striatum K.P.Biswas
262. Species Closterium strigosum Brébisson, 1856
263. Species Closterium striolatum Ehrenberg ex Ralfs, 1848
264. Species Closterium subacutum G.A.S.F.Sampaio
265. Species Closterium subangulatum R.Gutwinski
266. Species Closterium subangustatum West
267. Species Closterium subbiclavatum Lacoste de Díaz, 1980
268. Species Closterium subcostatum Nordstedt, 1880
269. Species Closterium subcrassum W.B.Turner, 1893
270. Species Closterium subdecorum M.I.Claassen
271. Species Closterium subfusiforme Messikommer, 1951
272. Species Closterium subjuncidiforme Grönblad, 1920
273. Species Closterium subjuncidum
274. Species Closterium sublagoense M.I.Claassen, 1961
275. Species Closterium sublanceolatum N.N.Woronichin
276. Species Closterium sublaterale Ruzicka, 1958
277. Species Closterium sublatifrons G.S.West, 1904
278. Species Closterium sublineatum R.Gutwinski, 1902
279. Species Closterium suborbiculare Wood
280. Species Closterium subrostratum Willi Krieger, 1932
281. Species Closterium subscoticum Gutwinski, 1902
282. Species Closterium substrigosum (M.Raciborski) West & G.S.West, 1908
283. Species Closterium subtile Brébisson, 1856
284. Species Closterium subulatum (Kützing) Brébisson, 1856
285. Species Closterium sulcatum L.A.Brébisson
286. Species Closterium tacomense Prescott, 1975
287. Species Closterium tenerrimum Kützing
288. Species Closterium tenerum N.N.Woronichin
289. Species Closterium tenue Kützing
290. Species Closterium tetractinium F.Gay
291. Species Closterium tortitaenioides Coesel, 2007
292. Species Closterium tortum B.M.Griffiths, 1925
293. Species Closterium toxon West, 1892
294. Species Closterium trabeculoides Corda, 1840
295. Species Closterium trochiscosporum West & G.S.West
296. Species Closterium truncatulum Y.V.Roll
297. Species Closterium truncatum L.A.Brébisson
298. Species Closterium truncatum M.I.Claassen
299. Species Closterium truncatum W.B.Turner, 1893
300. Species Closterium tumidulum F.Gay, 1884
301. Species Closterium tumidum L.N.Johnson, 1895
302. Species Closterium turgidulum Kützing
303. Species Closterium turgidulum Kützing ex J.Ralfs
304. Species Closterium turgidum Ehrenberg ex Ralfs, 1848
305. Species Closterium ulnoides G.A.S.F.Sampaio
306. Species Closterium ulva
307. Species Closterium validum West & G.S.West, 1902
308. Species Closterium variabile A.J.Brook, 1995
309. Species Closterium venus Kützing ex Ralfs, 1848
310. Species Closterium versteegianum C.Bernard
311. Species Closterium vulcanicum Skvortsov & Noda, 1967
312. Species Closterium wallichii W.B.Turner, 1892
313. Species Closterium warmbadianum M.I.Claassen
314. Species Closterium wittrockianum W.B.Turner, 1893
315. Species Closterium wittrockii W.B.Turner
316. Species Closterium acuminatum Kützing ex Ralfs accepted as Closterium dianae Ehrenberg ex Ralfs, 1848 (synonym)
317. Species Closterium acus (O.F.Müller) Nitzsch, 1816 accepted as Lepocinclis acus (O.F.Müller) B.Marin & Melkonian, 2003 (synonym)
318. Species Closterium affine F.Gay accepted as Closterium lunula Ehrenberg & Hemprich ex Ralfs, 1848 (synonym)
319. Species Closterium anastomosum West & G.S.West, 1902 accepted as Closterium directum var. anastomosum (West & G.S.West) Kurt Förster, 1981
320. Species Closterium arcuatum Brébisson ex Ralfs, 1848 accepted as Closterium dianae var. arcuatum (Brebisson ex Ralfs) Rabenhorst, 1868 (synonym)
321. Species Closterium australe (Raciborski) Lütkemüller accepted as Actinotaenium australe (Raciborski) Croasdale, 1981 (synonym)
322. Species Closterium baculum Brébisson, 1858 accepted as Pleurotaenium baculum (Brébisson) de Bary, 1858
323. Species Closterium balmacarense W.B.Turner, 1893 accepted as Closterium striolatum var. subtruncatum (West & G.S.West) Willi Krieger, 1935 (synonym)
324. Species Closterium bicurvatum Delponte, 1877 accepted as Closterium gracile var. bicurvatum (Delponte) Playfair (synonym)
325. Species Closterium brebissonii Meneghini, 1840 accepted as Tetmemorus brebissonii Ralfs, 1848 (synonym)
326. Species Closterium bucharicum I.A.Kisselev, 1930 accepted as Closterium manschuricum Skvortsov, 1926
327. Species Closterium calamus Playfair, 1907 accepted as Closterium acerosum var. elongatum Brébisson, 1856 (synonym)
328. Species Closterium calmus Playfair, 1907 accepted as Closterium acerosum var. elongatum Brébisson, 1856 (synonym)
329. Species Closterium cancer Playfair, 1907 accepted as Cystodinium cornifax (A.J.Schilling) G.A.Klebs, 1912
330. Species Closterium cingulum Playfair, 1907 accepted as Closterium dianae var. cingulum Playfair (synonym)
331. Species Closterium cornutum Playfair, 1907 accepted as Closterium parvulum var. cornutum (Playfair) Willi Krieger, 1937 (synonym)
332. Species Closterium crenulatum Ehrenberg, 1843 accepted as Pleurotaenium crenulatum (Ehrenberg ex Ralfs) Rabenhorst, 1868 (synonym)
333. Species Closterium cuspidatum Bailey, 1848 accepted as Spinoclosterium cuspidatum (Bailey) M.Hirano, 1949 (synonym)
334. Species Closterium cylindrus Ehrenberg, 1838 accepted as Penium cylindrus Brébisson ex Ralfs, 1848 (synonym)
335. Species Closterium decussatum Kützing, 1845 accepted as Closterium decussatum Kützing ex Ralfs, 1848 (synonym)
336. Species Closterium digitus Ehrenberg, 1832 accepted as Netrium digitus (Brébisson ex Ralfs) Itzigsohn & Rothe, 1856 (synonym)
337. Species Closterium dilatatum West & G.S.West, 1896 accepted as Closterium costatum var. dilatatum (West & G.S.West) Willi Krieger, 1935
338. Species Closterium elegans Brébisson, 1956 accepted as Closterium setaceum Ehrenberg ex Ralfs, 1848 (synonym)
339. Species Closterium falcatum (Corda) Meneghini, 1840 accepted as Ankistrodesmus falcatus (Corda) Ralfs, 1848
340. Species Closterium galiciense Gutwinski accepted as Cosmarium galiciense (Gutwinski) De-Lamonica-Freire
341. Species Closterium gibbum Borge, 1906 accepted as Closterium lundellii var. gibbum (Borge) O.V.Petlovany, 2015
342. Species Closterium giganteum C.Bernard, 1908 accepted as Closterium lunula var. giganteum (C.Bernard) Playfair, 1908 (synonym)
343. Species Closterium gigas F.Gay accepted as Closterium ehrenbergii Meneghini ex Ralfs, 1848 (synonym)
344. Species Closterium granulatum Brébisson, 1839 accepted as Tetmemorus granulatus Brébisson ex Ralfs, 1848 (synonym)
345. Species Closterium griffithii Berkeley, 1854 accepted as Monoraphidium griffithii (Berkeley) Komárková-Legnerová, 1969 (synonym)
346. Species Closterium infractum Messikommer, 1929 accepted as Actinotaenium infractum (Messikommer) D.B.Williamson, 2007 (synonym)
347. Species Closterium intervalicola J.A.Cushman, 1905 accepted as Closterium costatum var. westii J.A.Cushman, 1905
348. Species Closterium japonicum Suringar, 1867 accepted as Closterium macilentum var. japonicum (Suringar) Willi Krieger, 1935
349. Species Closterium laeve Kützing, 1845 accepted as Tetmemorus laevis Ralfs ex Ralfs, 1848 (synonym)
350. Species Closterium lamellosum Brébisson accepted as Netrium digitus var. lamellosum (Brébisson ex Kützing) Grönblad, 1920 (synonym)
351. Species Closterium libellula Focke ex Nordstedt, 1873 accepted as Closterium closteroides (Ralfs) A.Louis & Peeters, 1967 (synonym)
352. Species Closterium linea Perty, 1852 accepted as Closterium acutum var. linea (Perty) West & G.S.West, 1900 (synonym)
353. Species Closterium lundellii Lagerheim, 1883 accepted as Closterium cornu var. lundellii (Lagerheim) Willi Krieger, 1935
354. Species Closterium lusitanicum G.A.S.F.Sampaio, 1920 accepted as Closterium juncidum Ralfs, 1848 (synonym)
355. Species Closterium malinvernianum De Notaris, 1865 accepted as Closterium submoniliferum var. malinvernianum (De Notaris) Coesel, 2007 (synonym)
356. Species Closterium margaritaceum Ehrenberg, 1838 accepted as Penium margaritaceum Brébisson, 1848 (synonym)
357. Species Closterium massartii De Wildeman, 1900 accepted as Closterium lunula var. massartii (De Wildeman) Willi Krieger, 1937 (synonym)
358. Species Closterium mourense Playfair, 1907 accepted as Closterium lunula var. mourense Playfair (synonym)
359. Species Closterium nilsonii O.Borge, 1906 accepted as Closterium abruptum f. nilssonii (O.Borge) A.J.Brook & D.B.Williamson, 1993 (synonym)
360. Species Closterium nilssonii Borge, 1906 accepted as Closterium abruptum var. abruptum f. nilssonii (Borge) A.J.Brook & D.B.Williamson, 1993 accepted as Closterium abruptum West, 1892 (synonym)
361. Species Closterium novae-angliae J.A.Cushman, 1908 accepted as Closterium ralfsii var. novae-angliae (J.A.Cushman) W.Krieger, 1935
362. Species Closterium obtusum Brébisson, 1856 accepted as Roya obtusa (Brébisson) West & G.S.West, 1896 (synonym)
363. Species Closterium oligocampylum Schmidle, 1899 accepted as Closterium directum var. oligocampylum (Schmidle) Ruzicka, 1975 (synonym)
364. Species Closterium polymorphum Perty, 1849 accepted as Penium polymorphum (Perty) Perty, 1852 (synonym)
365. Species Closterium polystictum Nygaard, 1932 accepted as Closterium nordstedtii var. polystictum (Nygaard) Ruzicka, 1975 (synonym)
366. Species Closterium proboscideum W.B.Turner accepted as Closterium nematodes var. proboscideum W.B.Turner, 1893
367. Species Closterium pseudoclosterium J.Roy, 1894 accepted as Roya pseudoclosterium (J.Roy) West & G.S.West, 1896 (synonym)
368. Species Closterium pseudodianae J.Roy, 1890 accepted as Closterium dianae var. pseudodianae (J.Roy) Willi Krieger, 1935 (synonym)
369. Species Closterium pseudolibellula F.E.Fritsch, 1921 accepted as Closterium pseudolunula var. pseudolibellula (Fritsch) W.Krieger, 1935
370. Species Closterium punctatum Skuja, 1928 accepted as Closterium idiosporum var. punctatum W.Krieger, 1935
371. Species Closterium recurvatum Y.V.Roll, 1923 accepted as Closterium directum var. recurvatum (Roll) Willi Krieger, 1935 (synonym)
372. Species Closterium sceptrum Kützing, 1845 accepted as Pleurotaenium sceptrum (Kützing) Nägeli, 1849
373. Species Closterium sigmoideum Lagerheim & Nordstedt, 1893 accepted as Closterium acerosum Ehrenberg ex Ralfs, 1848 (synonym)
374. Species Closterium spetsbergense Borge, 1911 accepted as Closterium pseudolunula var. spetsbergense (Borge) Petlovany, 2015 (synonym)
375. Species Closterium stellenboschense W.Hodgetts, 1925 accepted as Closterium dianae var. stellenboschense (Hodgetts) W.Krieger, 1935
376. Species Closterium subcompactum West & G.S.West, 1902 accepted as Closterium navicula var. subcompactum (West & G.S.West) W.Krieger, 1935
377. Species Closterium subcostatum Alcorn, 1940 accepted as Closterium tacomense Prescott, 1975 (synonym)
378. Species Closterium subdirectum West, 1889 accepted as Closterium striolatum Ehrenberg ex Ralfs, 1848
379. Species Closterium subgibbum Y.V.Roll, 1915 accepted as Closterium lundellii var. gibbum (Borge) O.V.Petlovany, 2015
380. Species Closterium submoniliferum Woronichin [Voronichin], 1924 accepted as Closterium moniliferum var. submoniliferum (Woronchin) Willi Krieger, 1935 (synonym)
381. Species Closterium subporrectum West & G.S.West, 1902 accepted as Closterium porrectum var. angustatum West & G.S.West, 1904
382. Species Closterium subpronum West & G.S.West, 1894 accepted as Closterium aciculare T.West, 1860 (synonym)
383. Species Closterium subrectum Brébisson, 1835 accepted as Closterium didymotocum var. brebissonianum Rabenhorst
384. Species Closterium subscoticiforme Grönblad, 1920 accepted as Closterium subscoticum var. subscoticiforme (Grönblad) Willi Krieger, 1935
385. Species Closterium subspetsbergense Woronichin, 1924 accepted as Closterium spetsbergense var. subspetsbergense (Woronichin) Kossinskaja, 1960 (synonym)
386. Species Closterium subtruncatum West & G.S.West, 1897 accepted as Closterium striolatum var. subtruncatum (West & G.S.West) Willi Krieger, 1935 (synonym)
387. Species Closterium tenerrimum Kützing ex Ralfs, 1848 accepted as Closterium acutum Brébisson, 1848 (synonym)
388. Species Closterium trabecula Ehrenberg, 1832 accepted as Pleurotaenium trabecula Nägeli, 1849 (synonym)
389. Species Closterium ulna Focke ex W.B.Turner, 1892 accepted as Closterium directum W.Archer, 1862 (synonym)
390. Species Closterium varzinense J.Sampaio, 1922 accepted as Closterium costatum Corda ex Ralfs, 1848 (synonym)
391. Species Closterium verrucosum Bailey, 1846 accepted as Pleurotaenium verrucosum (Ralfs) H.C.Wood, 1873 (synonym)
392. Species Closterium verrucosum Y.V.Roll, 1925 accepted as Closterium venus var. verrucosum (Y.V.Roll) Willi Krieger, 1935
393. Species Closterium bogoriense C.Bernard (uncertain)
394. Species Closterium borodinianum Y.V.Roll (uncertain)
395. Species Closterium capense Rabenhorst, 1855 (uncertain)
396. Species Closterium carniolicum J.Lütkemüller (uncertain)
397. Species Closterium caudatum Corda (uncertain)
398. Species Closterium contortum W.Archer (uncertain, uncertain taxonomic status subjected to verification)
399. Species Closterium crameri C.Bernard (uncertain)
400. Species Closterium crassum Delponte, 1877 (uncertain)
401. Species Closterium diffussum Noda & Skvortzov, 1969 (uncertain)
402. Species Closterium doliolatum L.A.Brébisson (uncertain)
403. Species Closterium elongatum L.A.Brébisson (uncertain)
404. Species Closterium excavatum O.F.Borge, 1901 (uncertain)
405. Species Closterium falcatum W.M.Grant (uncertain)
406. Species Closterium gregarium G.G.A.Meneghini (uncertain)
407. Species Closterium incrassatum R.Gutwinski (uncertain)
408. Species Closterium isidis F.J.Cohn (uncertain)
409. Species Closterium koernickei C.Bernard (uncertain)
410. Species Closterium legumen West & G.S.West (uncertain)
411. Species Closterium linearifusiforme Noda, 1963 (uncertain, uncertain taxonomic status subjected to verification)
412. Species Closterium lineola K.E.Eichwald (uncertain)
413. Species Closterium lineolatum Ehrenberg (uncertain)
414. Species Closterium loefgrenii O.F.Borge (uncertain)
415. Species Closterium macedonicum Petkoff (uncertain)
416. Species Closterium malinvernicum G.De Notaris (uncertain)
417. Species Closterium margaritiferum Eichwald, 1852 (uncertain)
418. Species Closterium massarti E.A.J.De Wildeman (uncertain)
419. Species Closterium maximum (H.C.Wood) Schmidle (uncertain)
420. Species Closterium maximum E.A.J.De Wildeman (uncertain)
421. Species Closterium milliani M.Lefèvre (uncertain)
422. Species Closterium naviculoideum Playfair, 1907 (uncertain)
423. Species Closterium ornatum G.L.Rabenhorst (uncertain)
424. Species Closterium paludosum Thunmark, 1935 (uncertain, uncertain taxonomic status subjected to verification)
425. Species Closterium pseudanastomosum R.L.Grönblad (uncertain)
426. Species Closterium pseudopenium R.L.Grönblad (uncertain)
427. Species Closterium punctatum R.Gistl (uncertain)
428. Species Closterium retusum G.G.A.Meneghini (uncertain)
429. Species Closterium robustum W.N.Hastings (uncertain)
430. Species Closterium selenastrum M.Wanatabe, 1979 (uncertain, uncertain taxonomic status subjected to verification)
431. Species Closterium silesiacum R.L.Grönblad (uncertain)
432. Species Closterium s-romanum Huber-Pestalozzi, 1925 (uncertain)
433. Species Closterium subcapitatum West & G.S.West (uncertain)
434. Species Closterium subcoronulatum No authority known (uncertain)
435. Species Closterium submalinvernianum N.N.Woronichin (uncertain)
436. Species Closterium subsiliqua M.I.Claassen (uncertain)
437. Species Closterium subspetzbergense N.N.Woronichin (uncertain)
438. Species Closterium subturgidum C.F.O.Nordstedt (uncertain)
439. Species Closterium tenuissimum M.Schmidt, 1903 (uncertain, uncertain taxonomic status subjected to verification)
440. Species Closterium thureti L.A.Brébisson (uncertain)
441. Species Closterium uncinatum Kützing (uncertain)
442. Species Closterium uncinatum Kützing ex J.Ralfs (uncertain)
443. Species Closterium wagae R.Gutwinski (uncertain)

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