1. Species Melosira agassizii Ostenfeld, 1909
2. Species Melosira aueri Cleve-Euler, 1948
3. Species Melosira baikalensis S.Wislouch, 1924
4. Species Melosira borreri Greville, 1833
5. Species Melosira borrerii
6. Species Melosira dickiei (Thwaites) Kützing, 1849
7. Species Melosira hormoides Montagne, 1939
8. Species Melosira hustedtii Krasske, 1939
9. Species Melosira indica Skvortzov
10. Species Melosira inflexa (Roth) Guiry, 2019
11. Species Melosira irregularis O.Müller
12. Species Melosira jeanbertrandiana Van de Vijver & Crawford
13. Species Melosira jilinensis Huang in Huang et al., 1983 †
14. Species Melosira jurgensi
15. Species Melosira lentigera (Carmichael) Harvey
16. Species Melosira lyrata Ehrenberg
17. Species Melosira montagnei (Kützing) N.G.W.Lagerstedt
18. Species Melosira ornata Grunow
19. Species Melosira praedistans
20. Species Melosira punctata (W.Smith) J.Dannf., 1882
21. Species Melosira pyxis Otto Müller
22. Species Melosira roseana Rabenhorst
23. Species Melosira salina Kützing, 1844
24. Species Melosira sol Kützing, 1849
25. Species Melosira undulata (Ehrenberg) Kützing, 1844
26. Species Melosira varians C.Agardh, 1827
27. Species Melosira youngi Skvortzov
28. Species Melosira arenaria Moore ex Ralfs, 1843 accepted as Ellerbeckia arenaria (Moore ex Ralfs) R.M.Crawford, 1988 accepted as Melosira arenaria var. arenaria Moore ex Ralfs, 1843 (synonym)
29. Species Melosira binderana Kützing, 1844 accepted as Stephanodiscus binderanus (Kützing) Krieger, 1927 (basionym)
30. Species Melosira dendroteres (Ehrenberg) R.Ross, 1947 accepted as Orthoseira dendroteres (Ehrenberg) F.E.Round, R.M.Crawford & D.G.Mann, 1990 (synonym)
31. Species Melosira distans (Ehrenberg) Kützing, 1844 accepted as Aulacoseira distans (Ehrenberg) Simonsen, 1979 † (synonym)
32. Species Melosira echinus Frenguelli, 1938 accepted as Pseudopodosira echinus (Frenguelli) D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005 † (unaccepted > superseded combination)
33. Species Melosira granulata (Ehrenberg) Ralfs, 1861 accepted as Aulacoseira granulata (Ehrenberg) Simonsen, 1979 (synonym)
34. Species Melosira hustedti Krasske, 1939 accepted as Melosira hustedtii Krasske, 1939 (unaccepted > misspelling - incorrect original spelling)
35. Species Melosira ikapoensis Otto Müller, 1904 accepted as Aulacoseira ikapoensis (Otto Müller) Simonsen, 1979 accepted as Melosira ikapoensis var. ikapoensis Otto Müller, 1904 (synonym)
36. Species Melosira juergensi C. Agardh, 1824 accepted as Melosira lineata (Dillwyn) C.Agardh, 1824
37. Species Melosira juergensii C.Agardh, 1824 accepted as Melosira lineata (Dillwyn) C.Agardh, 1824 (synonym)
38. Species Melosira longispina Hustedt, 1942 accepted as Aulacoseira subarctica var. longispina (Hustedt) A.Tuji & A.Houki, 2004 accepted as Melosira longispina var. longispina Hustedt in Huber-Pestalozzi, 1942 (synonym)
39. Species Melosira monoliformis (O.F. Müller) C. Agardh, 1824 accepted as Melosira moniliformis (O.F.Müller) C.Agardh, 1824 (misspelling)
40. Species Melosira perpusilla Frenguelli, 1923 (unaccepted > nomen nudum)
41. Species Melosira pseudogranulata Cleve-Euler, 1948 accepted as Aulacoseira pseudogranulata (Cleve-Euler) Simonsen, 1979 (unaccepted > superseded combination)
42. Species Melosira solida Eulenstein, 1882 accepted as Aulacoseira solida (Eulenstein) K.Krammer, 1991 † accepted as Melosira solida var. solida Eulenstein in Grunow in Van Heurck, 1882 (synonym)
43. Species Melosira thaitiensis F.S.Castracane degli Antelminelli accepted as Melosira tahitiensis Castracane, 1886 (misspelling)
44. Variety Melosira var. tenella (Nygaard) accepted as Aulacoseira distans var. tenella (Nygaard) R.Ross, 1986 accepted as Aulacoseira tenella (Nygaard) Simonsen, 1979 accepted as Melosira tenella Nygaard, 1956 (synonym)
45. Species Melosira westii W.Smith, 1856 accepted as Pseudopodosira westii (W.Smith) Sheshukova-Poretzskaya & Glezer, 1964 † accepted as Melosira westii f. westii W. Smith, 1856 (synonym)
46. Species Melosira accinctus Hohn & Hellerman, 1963 (uncertain > unassessed)
47. Species Melosira aculeifera Scheschukova-Poretzkaya in Scheschukova-Poretzkaya & Moissejeva, 1964 (uncertain > unassessed)
48. Species Melosira adeliae Manguin, 1957 (uncertain > unassessed)
49. Species Melosira aequalis Agardh, 1832 (uncertain > unassessed)
50. Species Melosira africana Leuduger-Fortmorel, 1898 (uncertain > unassessed)
51. Species Melosira agria Pantocsek, 1905 (uncertain > unassessed)
52. Species Melosira akkavaarensis Tynni, 1982 (uncertain > unassessed)
53. Species Melosira albicans Sheshukova, 1961 (uncertain > unassessed)
54. Species Melosira alphabetica Mann, 1937 (uncertain > unassessed)
55. Species Melosira alternans Pouchet, 1893 (uncertain > unassessed)
56. Species Melosira ambigua (Grunow) O.F.Müller (uncertain > unassessed)
57. Species Melosira americana Kützing, 1844 (uncertain > unassessed)
58. Species Melosira anastomosans Grunow in Van Heurck, 1882 (uncertain > unassessed)
59. Species Melosira angulata (Gregory) Rabenhorst, 1864 accepted as Orthosira angulata Gregory, 1857 (uncertain > unassessed)
60. Species Melosira angustissima Neizvestnova-Zhadina, 1941 (uncertain > unassessed)
61. Species Melosira annularis Eichwald, 1847 (uncertain > unassessed)
62. Species Melosira anormal Van Heurck, 1882 (uncertain > unassessed)
63. Species Melosira antarctica Van Heurck, 1909 (uncertain > unassessed)
64. Species Melosira antiqua A.I.Moiseeva, 1963 † accepted as Alveolophora antiqua (A.I.Moisseeva) A.I.Moisseeva, 1990 † (uncertain, homotypic synonym)
65. Species Melosira architecturalis Brun in Schmidt et al., 1892 † (uncertain > unassessed)
66. Species Melosira arctica Dickie, 1852 (uncertain > unassessed)
67. Species Melosira arctica (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella arctica (Dickie) Ehrenberg, 1853 accepted as Melosira arctica var. arctica Dickie in litt., Ehrenberg, 1853 (uncertain > unassessed)
68. Species Melosira arcuata Pantocsek, 1892 (uncertain > unassessed)
69. Species Melosira arenosa Moore ex Hassall, 1852 (uncertain > unassessed)
70. Species Melosira arentii (Kolbe) Nagumo & Kobayasi, 1977 accepted as Cyclotella arentii Kolbe, 1948 (uncertain > unassessed)
71. Species Melosira areolata O.Müller, 1904 (uncertain > unassessed)
72. Species Melosira areolata A.I.Moissejeva, 1971 accepted as Alveolophora areolata A.I.Moiseeva, 1990 † (uncertain > unassessed, homotypic synonym)
73. Species Melosira argus Otto Müller, 1904 (uncertain > unassessed)
74. Species Melosira arundinacea F.S.Castracane degli Antelminelli (uncertain > unassessed)
75. Species Melosira asiatica Brun in Schmidt et al., 1892 accepted as Cyclotella asiatica Brun in Brun & Tempère, 1889 (uncertain > unassessed)
76. Species Melosira astridae D. Metzeltin & H. Lange-Bertalot, 2007 (uncertain > unassessed)
77. Species Melosira atlymica Rubina, 1962 (uncertain > unassessed)
78. Species Melosira bacillosa Otto Müller, 1903 (uncertain > unassessed)
79. Species Melosira baicalensis (K.I.Meyer) Wislouch (uncertain > unassessed)
80. Species Melosira baileyi (H.L.Smith) Wolle, 1890 accepted as Cestodiscus baileyi H.L.Smith, 1878 † (uncertain > unassessed)
81. Species Melosira bellicosa Héribaud, 1903 (uncertain > unassessed)
82. Species Melosira biharensis Pantocsek, 1886 (uncertain > unassessed)
83. Species Melosira binderiana (Kützing) Rabenhorst, 1853 accepted as Melosira italica var. binderiana Kützing, 1844 (uncertain > unassessed)
84. Species Melosira biseriata (Ehrenberg) Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
85. Species Melosira bituminosa Pantocsek (uncertain > unassessed)
86. Species Melosira biwae Mori, 1974 (uncertain > unassessed)
87. Species Melosira bongrainii M. Peragallo, 1921 (uncertain > unassessed)
88. Species Melosira borreri sensu Wyatt (uncertain > unassessed)
89. Species Melosira bottnica Grunow in Cleve & Möller, 1879 (uncertain > unassessed)
90. Species Melosira boulayana Peragallo in Héribaud, 1902 (uncertain > unassessed)
91. Species Melosira brandinii L.F.Fernandes & R.M.Souza-Mosimann, 2001 (uncertain > unassessed)
92. Species Melosira bruni M.Peragallo & Héribaud-Joseph (uncertain > unassessed)
93. Species Melosira californica (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella californica Ehrenberg, 1852 (uncertain > unassessed)
94. Species Melosira caliginosa Hanna, 1927 (uncertain > unassessed)
95. Species Melosira calligera (Ehrenberg) Kützing, 1849 accepted as Gaillonella calligera Ehrenberg, 1845 (uncertain > unassessed)
96. Species Melosira campaniensis Moshkovitz, Ehrlich & Soudry, 1983 (uncertain > unassessed)
97. Species Melosira campylosira (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella campylosira Ehrenberg, 1854 (uncertain > unassessed)
98. Species Melosira camusi Héribaud-Joseph (uncertain > unassessed)
99. Species Melosira canadensis Hustedt, 1952 (uncertain > unassessed)
100. Species Melosira canalifera J.-J.Brun & Héribaud-Joseph (uncertain > unassessed)
101. Species Melosira caputmedusae Pantocsek, 1886 (uncertain > unassessed)
102. Species Melosira carconensis Grunow in Van Heurck, 1882 (uncertain > unassessed)
103. Species Melosira caspica Henckel, 1909 (uncertain > unassessed)
104. Species Melosira castracani (Brun) Tsumura, 1967 accepted as Cyclotella castracani Brun, 1891 (uncertain > unassessed)
105. Species Melosira cataractarum F.Hustedt accepted as Nanofrustulum cataractarum (Hust.) C.E.Wetzel, E.Morales & Ector, 2019 (uncertain > unassessed)
106. Species Melosira catenata Brun, 1895 (uncertain > unassessed)
107. Species Melosira charcotii M. Peragallo, 1921 (uncertain > unassessed)
108. Species Melosira cincta Pantocsek, 1886 (uncertain > unassessed)
109. Species Melosira circularis (Ehreb.) Ralfs, 1861 accepted as Gaillonella circularis Ehrenberg, 1854 (uncertain > unassessed)
110. Species Melosira circulata (uncertain > unassessed)
111. Species Melosira clavigera Grunow in Van Heurck, 1882 (uncertain > unassessed)
112. Species Melosira clypeus J. Brun in Brun & Tempère, 1889 (uncertain > unassessed)
113. Species Melosira coarctata (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella coarctata Ehrenberg, 1843 (uncertain > unassessed)
114. Species Melosira complexa Lohman, 1948 (uncertain > unassessed)
115. Species Melosira concatenata (Kützing) Rabenhorst, 1864 accepted as Melosira salina var. concatenata Kützing, 1844 (uncertain > unassessed)
116. Species Melosira concentrica (A.Schmidt) J.Fenner accepted as Paralia concentrica Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
117. Species Melosira concinna Castracane, 1866 (uncertain > unassessed)
118. Species Melosira constricta Akimova, 1940 (uncertain > unassessed)
119. Species Melosira cornuta Tempère & Brun in Brun & Tempère, 1889 (uncertain > unassessed)
120. Species Melosira coronaria Mann, 1907 (uncertain > unassessed)
121. Species Melosira coronaria M. Peragallo in Peragallo & Peragallo, 1911 (uncertain > unassessed)
122. Species Melosira coronata (Ehrenberg) Kützing (uncertain > unassessed)
123. Species Melosira coronata sensu Kutzing, 1849 (uncertain > unassessed)
124. Species Melosira costata Greville, 1866 (uncertain > unassessed)
125. Species Melosira crassa K.E. Lohman, 1957 (uncertain > unassessed)
126. Species Melosira crenata (Ehrenberg) Cramer, 1868 accepted as Gaillonella crenata Ehrenberg, 1844 (uncertain > unassessed)
127. Species Melosira crenulata (Ehrenberg) Kützing, 1844 accepted as Gaillonella crenulata var. crenulata Ehrenberg, 1843 (uncertain > unassessed)
128. Species Melosira crenulata Cleve & Möller (uncertain > unassessed)
129. Species Melosira crenulatata (uncertain > unassessed)
130. Species Melosira cretacea Jousé, 1951 (uncertain > unassessed)
131. Species Melosira cribrosa Brebisson in W. Smith, 1857 (uncertain > unassessed)
132. Species Melosira cristata Pantocsek, 1889 (uncertain > unassessed)
133. Species Melosira crotonensis (J.W. Bailey) H.L. Smith, 1876 accepted as Gaillonella crotonensis J.W. Bailey, 1854 (uncertain > unassessed)
134. Species Melosira crotonensis sensu Wolle, 1890 (uncertain > unassessed)
135. Species Melosira crucicula G.B.De Toni (uncertain > unassessed)
136. Species Melosira crucipunctata Bachmann, 1936 (uncertain > unassessed)
137. Species Melosira csakyana Pantocsek, 1913 (uncertain > unassessed)
138. Species Melosira cucullata Chen, 1980 (uncertain > unassessed)
139. Species Melosira curvatula Janisch in Schmidt et al., 1892 (uncertain > unassessed)
140. Species Melosira cycola Ehrenberg (uncertain > unassessed)
141. Species Melosira dactylus (Ehrenberg) Tempère & Peragallo, 1914 (uncertain > unassessed)
142. Species Melosira davidsonii Schmidt in Schmidt et al., 1893 (uncertain > unassessed)
143. Species Melosira de vriesii Otto Müller, 1903 (uncertain > unassessed)
144. Species Melosira deblockii H.F.Van Heurck (uncertain > unassessed)
145. Species Melosira debyi (Pantocsek) F.W. Mills, 1934 accepted as Paralia debyi Pantocsek, 1892 (uncertain > unassessed)
146. Species Melosira debyi (Pantocsek) Jurilj, 1957 accepted as Paralia debyi Pantocsek, 1892 (uncertain > unassessed)
147. Species Melosira decipiens Grove in Schmidt et al., 1893 (uncertain > unassessed)
148. Species Melosira decussata (Ehrenberg) Kützing (uncertain > unassessed)
149. Species Melosira dendrophila (Ehrenberg) R.Ross & P.A.Sims, 1978 (uncertain > unassessed)
150. Species Melosira densserrae Long, Fuge & Smith, 1946 (uncertain > unassessed)
151. Species Melosira dentata H.L. Smith, 1884 (uncertain > unassessed)
152. Species Melosira denticulata K.E. Lohman, 1957 (uncertain > unassessed)
153. Species Melosira dewildemanii Van Heurck, 1909 (uncertain > unassessed)
154. Species Melosira discigera Agardh, 1824 (uncertain > unassessed)
155. Species Melosira dispersa Carter, 1966 (uncertain > unassessed)
156. Species Melosira distans (Grunow in Van Heurck) Skabichevskii, 1960 accepted as Melosira distans f. alpigena Grunow in Van Heurck, 1882 (uncertain > unassessed)
157. Species Melosira dougetii Manguin, 1957 (uncertain > unassessed)
158. Species Melosira dozyana Kützing (uncertain > unassessed)
159. Species Melosira dubia Kützing, 1844 (uncertain > unassessed)
160. Species Melosira duplicata Schmidt in Schmidt et al., 1893 (uncertain > unassessed)
161. Species Melosira dura Mann, 1925 (uncertain > unassessed)
162. Species Melosira echinata E.E.Manguin (uncertain > unassessed)
163. Species Melosira elegans Mukhina in Jousé & Mukhina, 1978 (uncertain > unassessed)
164. Species Melosira elongata Jousé, 1966 (uncertain > unassessed)
165. Species Melosira epidendron (Ehrenberg) Boyer, 1927 accepted as Stephanosira epidendron Ehrenberg, 1848 (uncertain > unassessed)
166. Species Melosira excentrica Pantocsek, 1892 (uncertain > unassessed)
167. Species Melosira excurrens Nygaard, 1956 (uncertain > unassessed)
168. Species Melosira exspectata Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
169. Species Melosira fausta A.W.F.Schmidt, 1892 † (uncertain > unassessed)
170. Species Melosira febigerii (Grunow in Cleve & Grunow) Mann, 1907 accepted as Podosira febigeri Grunow in Cleve & Grunow, 1880 (uncertain > unassessed)
171. Species Melosira fennoscandica Cleve-Euler, 1943 (uncertain > unassessed)
172. Species Melosira ferox Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
173. Species Melosira forolivensis Forti in Tempère & Peragallo, 1914 (uncertain > unassessed)
174. Species Melosira fragilis (Roth) Kützing, 1833 (uncertain > unassessed)
175. Species Melosira franklinii (Ehrenberg) Cleve, 1868 accepted as Craspedodiscus franklinii Ehrenberg, 1853 (uncertain > unassessed)
176. Species Melosira frigida Jousé, 1959 (uncertain > unassessed)
177. Species Melosira fungiformis Pantocsek, 1892 (uncertain > unassessed)
178. Species Melosira gallica (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella gallica Ehrenberg, 1836 (uncertain > unassessed)
179. Species Melosira gardneri I.Kaczmarska, 1985 † (uncertain > unassessed)
180. Species Melosira garganica Rabenhorst, 1853 (uncertain > unassessed)
181. Species Melosira gelida Cleve, 1883 (uncertain > unassessed)
182. Species Melosira geometrica Hanna, 1932 (uncertain > unassessed)
183. Species Melosira gessneri F.Hustedt, 1965 (uncertain > unassessed)
184. Species Melosira glacialis (Grunow) Cleve-Euler, 1951 accepted as Podosira hormoides var. glacialis Grunow, 1884 (uncertain > unassessed)
185. Species Melosira globifera (D.Carmichael) Harvey (uncertain > unassessed)
186. Species Melosira glomus F.C.Castracane degli Antelminelli (uncertain > unassessed)
187. Species Melosira godfroyi M. Peragallo, 1921 (uncertain > unassessed)
188. Species Melosira goetzeana O.Müller (uncertain > unassessed)
189. Species Melosira goretzkyi Tscheremissinova, 1956 (uncertain > unassessed)
190. Species Melosira gothica Cleve-Euler, 1951 (uncertain > unassessed)
191. Species Melosira gowenii Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
192. Species Melosira grandis Perty, 1852 (uncertain > unassessed)
193. Species Melosira granulata auct. non (Ehrenberg) (uncertain > unassessed)
194. Species Melosira granulata Otto Müller, 1903 (uncertain > unassessed)
195. Species Melosira granulata sensu L.W. Bailey, 1861 (uncertain > unassessed)
196. Species Melosira granulata Otto Müller, 1903 (uncertain > unassessed)
197. Species Melosira granulata (Otto Müller) Skabichevskii, 1960 accepted as Melosira granulata f. angustissima Otto Müller, 1899 (uncertain > unassessed)
198. Species Melosira granulata (Otto Müller) Cleve-Euler, 1938 accepted as Melosira granulata f. angustissima Otto Müller, 1899 (uncertain > unassessed)
199. Species Melosira granulata Otto Müller, 1904 (uncertain > unassessed)
200. Species Melosira granulata Otto Müller, 1904 (uncertain > unassessed)
201. Species Melosira granulosa O.Müller (uncertain > unassessed)
202. Species Melosira grovei Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
203. Species Melosira guillauminii Manguin ex Kociolek & Reviers, 1996 (uncertain > unassessed)
204. Species Melosira halophila (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella halophila Ehrenberg, 1854 (uncertain > unassessed)
205. Species Melosira haradaae Pantocsek, 1892 (uncertain > unassessed)
206. Species Melosira helvetica (O.F.Müller) Cleve-Euler, 1911 (uncertain > unassessed)
207. Species Melosira helvetica Ailio, 1915 (uncertain > unassessed)
208. Species Melosira heribaudii Brun in A. Schmidt, 1893 (uncertain > unassessed)
209. Species Melosira herzogii Lemmermann (uncertain > unassessed)
210. Species Melosira hetrurica Kützing, 1844 (uncertain > unassessed)
211. Species Melosira heufleri G.G.A.Meneghini (uncertain > unassessed)
212. Species Melosira hibschii Reichelt, 1897-1900 (uncertain > unassessed)
213. Species Melosira hispanica Hajós, 1982 (uncertain > unassessed)
214. Species Melosira hispida H. Peragallo, 1888 (uncertain > unassessed)
215. Species Melosira hispida C.Janisch (uncertain > unassessed)
216. Species Melosira hispida sensu Schmidt in Schmidt et al., 1893 (uncertain > unassessed)
217. Species Melosira hokkaidoana Pantocsek, 1892 (uncertain > unassessed)
218. Species Melosira horologium (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella horologium Ehrenberg, 1843 (uncertain > unassessed)
219. Species Melosira hummii Hustedt, 1955 (uncertain > unassessed)
220. Species Melosira hunanica Chen & Zhu † (uncertain)
221. Species Melosira hungarica Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
222. Species Melosira hungarica Pantocsek, 1892 (uncertain > unassessed)
223. Species Melosira hyalina Sypniewsky, 1860 (uncertain > unassessed)
224. Species Melosira hyalina Castracane, 1886 (uncertain > unassessed)
225. Species Melosira hyalina Karsten, 1905 (uncertain > unassessed)
226. Species Melosira hyalina K.E. Lohman, 1957 (uncertain > unassessed)
227. Species Melosira hyalinula De Toni, 1894 (uncertain > unassessed)
228. Species Melosira hyperborea Grunow, 1882 (uncertain > unassessed)
229. Species Melosira ignota Rubina, 1962 (uncertain > unassessed)
230. Species Melosira imperfecta Héribaud, 1903 (uncertain > unassessed)
231. Species Melosira incertum Leuduger-Fortmorel, 1898 (uncertain > unassessed)
232. Species Melosira incompta Mann, 1925 (uncertain > unassessed)
233. Species Melosira incorrupta Carter, 1966 (uncertain > unassessed)
234. Species Melosira inordinata Lohman & Andrews, 1968 (uncertain > unassessed)
235. Species Melosira interjecta (Janisch in Schmidt et al.) De Toni, 1894 accepted as Orthosira interjecta Janisch in Schmidt et al., 1892 (uncertain > unassessed)
236. Species Melosira interrupta Lohman & Andrews, 1968 (uncertain > unassessed)
237. Species Melosira irregularis (Eichwald) Eichwald, 1847 accepted as Gaillonella irregularis Eichwald, 1844 (uncertain > unassessed)
238. Species Melosira irregularis Pantocsek, 1889 (uncertain > unassessed)
239. Species Melosira islandica O.F.Müller, 1906 (uncertain > unassessed)
240. Species Melosira islandica Cleve-Euler, 1938 (uncertain > unassessed)
241. Species Melosira italica (Ehrenberg) Kützing, 1844 (uncertain > unassessed)
242. Species Melosira italica Komarenko, 1956 (uncertain > unassessed)
243. Species Melosira italica Hustedt, 1942 (uncertain > unassessed)
244. Species Melosira italica (Grunow) Skabichevskii, 1960 accepted as Melosira italica var. valida Grunow, 1881 (uncertain > unassessed)
245. Species Melosira italica Otto Müller, 1906 (uncertain > unassessed)
246. Species Melosira italica Otto Müller, 1906 (uncertain > unassessed)
247. Species Melosira italica (Grunow) Cleve-Euler, 1938 accepted as Melosira crenulata var. ambigua Grunow, 1882 (uncertain > unassessed)
248. Species Melosira japonica Pantocsek, 1892 (uncertain > unassessed)
249. Species Melosira japonica F.Meister, 1913 (uncertain > unassessed)
250. Species Melosira jenyssejana Henckel, 1926 (uncertain > unassessed)
251. Species Melosira jilinensis Huang † (uncertain)
252. Species Melosira johnesii Meyer, 1925 (uncertain > unassessed)
253. Species Melosira jouseana Moissejeva, 1971 † accepted as Alveolophora jouseana (A.I.Moiseeva) A.I.Moiseeva, 1990 † (uncertain > unassessed, homotypic synonym)
254. Species Melosira juergensii sensu Vanhoffen, 1897 (uncertain > unassessed)
255. Species Melosira jüergensii (uncertain > unassessed)
256. Species Melosira jurgensii Kützing (uncertain > unassessed)
257. Species Melosira jurlijii Gyarmati & Hajós † (uncertain > nomen dubium, nomen?)
258. Species Melosira jutlandica Grunow (uncertain > unassessed)
259. Species Melosira kamtschatica Grunow ex Cleve & Moller, 1877 (uncertain > unassessed)
260. Species Melosira karelica Mölder, 1951 (uncertain > unassessed)
261. Species Melosira karsteni Mangin, 1915 (uncertain > unassessed)
262. Species Melosira kochii Pantocsek, 1892 (uncertain > unassessed)
263. Species Melosira kondeensis Otto Müller, 1904 (uncertain > unassessed)
264. Species Melosira labuensis Cleve, 1883 (uncertain > unassessed)
265. Species Melosira lacustris Chase, 1886 (uncertain > unassessed)
266. Species Melosira laevis (Ehrenberg) J.Ralfs (uncertain > unassessed)
267. Species Melosira laevissima Grunow, 1882 (uncertain > unassessed)
268. Species Melosira laminaris (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella laminaris Ehrenberg, 1854 (uncertain > unassessed)
269. Species Melosira lauterbornii Pantocsek, 1908 (uncertain > unassessed)
270. Species Melosira lineata (Dillwyn) C.Agardh, 1824 (uncertain > unassessed)
271. Species Melosira lineolata sensu Grunow, 1884 (uncertain > unassessed)
272. Species Melosira lirata (Ehrenberg) Kützing, 1844 (uncertain > unassessed)
273. Species Melosira loczyi Pantocsek, 1889 (uncertain > unassessed)
274. Species Melosira lolia Hanna, 1927 (uncertain > unassessed)
275. Species Melosira lucida Cleve-Euler, 1939 (uncertain > unassessed)
276. Species Melosira lyrata Grunow in A. Schmidt, 1893 (uncertain > unassessed)
277. Species Melosira maculata Lagerst., 1876 accepted as Podosira maculata W.Smith, 1856 (uncertain > unassessed)
278. Species Melosira madagascariensis Schmidt in Schmidt et al., 1893 (uncertain > unassessed)
279. Species Melosira magnusii Otto Müller, 1904 (uncertain > unassessed)
280. Species Melosira major Grove in Schmidt et al., 1892 (uncertain > unassessed)
281. Species Melosira marchica (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella marchica Ehrenberg, 1843 (uncertain > unassessed)
282. Species Melosira mareei Kufferath, 1956 (uncertain > unassessed)
283. Species Melosira margarita K.E. Lohman, 1957 (uncertain > unassessed)
284. Species Melosira marginata Hajós, 1968 (uncertain > unassessed)
285. Species Melosira marina (W.Smith) Janisch, 1862 accepted as Orthosira marina W. Smith, 1856 (uncertain > unassessed)
286. Species Melosira mauryana Héribaud-Joseph (uncertain > unassessed)
287. Species Melosira mbasiensis Otto Müller, 1904 (uncertain > unassessed)
288. Species Melosira mediterranea Grunow in Van Heurck, 1882 (uncertain > unassessed)
289. Species Melosira medusa Mann, 1907 (uncertain > unassessed)
290. Species Melosira melinitica Pantocsek, 1886 (uncertain > unassessed)
291. Species Melosira mesodon (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella mesodon Ehrenberg, 1854 (uncertain > unassessed)
292. Species Melosira mexicana Grunow ex Cleve & Möller, 1878 (uncertain > unassessed)
293. Species Melosira micropunctata K.E. Lohman, 1957 (uncertain > unassessed)
294. Species Melosira mikkelsenii Nygaard, 1956 (uncertain > unassessed)
295. Species Melosira miniliformis (uncertain > unassessed)
296. Species Melosira minima Hajós, 1968 (uncertain > unassessed)
297. Species Melosira minuta Héribaud, 1903 (uncertain > unassessed)
298. Species Melosira minutula F.J.Chauvin (uncertain > unassessed)
299. Species Melosira miocaenica E.A.Cheremisinova (uncertain > unassessed)
300. Species Melosira mirabilis Brun in Schmidt et al., 1892 (uncertain > unassessed)
301. Species Melosira moisseevae Lupikina, 1984 (uncertain > unassessed)
302. Species Melosira moniliformis (O.F.Müller) C.Agardh, 1824 (uncertain > unassessed)
303. Species Melosira monospina (uncertain > unassessed)
304. Species Melosira mucosa Manguin, 1915 (uncertain > unassessed)
305. Species Melosira muelleri VanLandingham, 1971 (uncertain > unassessed)
306. Species Melosira muscigena Iwahashi, 1936 (uncertain > unassessed)
307. Species Melosira mutabilis Otto Müller (uncertain > unassessed)
308. Species Melosira muzzanensis Meister, 1912 (uncertain > unassessed)
309. Species Melosira naegeli Ralfs in Pritchard, 1861 (uncertain > unassessed)
310. Species Melosira natans Hilse, 1863 (uncertain > unassessed)
311. Species Melosira neocaledonica Manguin, 1962 (uncertain > unassessed)
312. Species Melosira neocaledonica Kociolek & Reviers (uncertain > unassessed)
313. Species Melosira neogena Pantocsek, 1913 (uncertain > unassessed)
314. Species Melosira neosphaerica VanLandingham, 1971 (uncertain > unassessed)
315. Species Melosira neostriata VanLandingham, 1971 (uncertain > unassessed)
316. Species Melosira nivalis W.Smith, 1855 (uncertain > unassessed)
317. Species Melosira nobilis Greville, 1865 (uncertain > unassessed)
318. Species Melosira normannii Arnott in Van Heurck, 1882 (uncertain > unassessed)
319. Species Melosira nuda Hajós, 1959 (uncertain > unassessed)
320. Species Melosira nuda K.E. Lohman, 1957 (uncertain > unassessed)
321. Species Melosira nummuloides C.Agardh, 1824 accepted as Melosira discigera Agardh, 1824 (uncertain > unassessed)
322. Species Melosira nummuloides Greville (uncertain > unassessed)
323. Species Melosira nummuloides W. Smith (uncertain > unassessed)
324. Species Melosira nummuloides sensu Vanhoffen, 1897 (uncertain > unassessed)
325. Species Melosira nummulus A.F.Meunier, 1915 (uncertain > unassessed)
326. Species Melosira numulina Agardh (uncertain > unassessed)
327. Species Melosira nyassensis Otto Müller, 1904 (uncertain > unassessed)
328. Species Melosira nygaardii Camburn, 1986 (uncertain > unassessed)
329. Species Melosira oamaruensis Grove & Sturt, 1887 (uncertain > unassessed)
330. Species Melosira oceanica (Ehrenberg; Ehrenberg) Leuduger-Fortmorel, 1879 accepted as Endictya oceanica Ehrenberg, 1845 (uncertain > unassessed)
331. Species Melosira ochracea (A.W.Roth) J.Ralfs (uncertain > unassessed)
332. Species Melosira octogona A.W.F.Schmidt, 1893 (uncertain > unassessed)
333. Species Melosira oculus (Ehrenberg) Kützing (uncertain > unassessed)
334. Species Melosira oculuschamaeleontis Ehernberg, 1844 (1845) (uncertain > unassessed)
335. Species Melosira oestrupi Cleve-Euler, 1910 (uncertain > unassessed)
336. Species Melosira omma Cleve (uncertain > unassessed)
337. Species Melosira orbifera Brun in Schmidt et al., 1892 (uncertain > unassessed)
338. Species Melosira ordinata (Kützing) (uncertain > unassessed)
339. Species Melosira orichalcea (Mertens ex Jürgens) Kützing, 1833 (uncertain > unassessed)
340. Species Melosira orichalcea sensu Brun, 1880 (uncertain > unassessed)
341. Species Melosira ornata auct. non Grunow, 1884 (uncertain > unassessed)
342. Species Melosira ostrupi A. Cleve (uncertain > unassessed)
343. Species Melosira ostrupii Héribaud in Héribaud et al., 1920 (uncertain > unassessed)
344. Species Melosira pantocseki (Van Heurck) Frenguelli, 1960 accepted as Hyalodiscus pantocsekii var. pantocsekii Van Heurck, 1909 (uncertain > unassessed)
345. Species Melosira papilio Mukhina in Jousé & Mukhina, 1978 (uncertain > unassessed)
346. Species Melosira papillifera Hendey, 1972 (uncertain > unassessed)
347. Species Melosira patagonica (Otto Müller) Cleve-Euler accepted as Melosira lineolata var. patagonica Otto Müller, 1909 (uncertain > unassessed)
348. Species Melosira patera J.A. Long, D.P. Fuge & J. Smith, 1946 (uncertain > unassessed)
349. Species Melosira paucipunctata K.E. Lohman, 1957 (uncertain > unassessed)
350. Species Melosira pella Lohman & Andrews, 1968 (uncertain > unassessed)
351. Species Melosira pensacolae Schmidt in Schmidt et al., 1893 (uncertain > unassessed)
352. Species Melosira peragalloii Pantocsek, 1892 (uncertain > unassessed)
353. Species Melosira perglabra Østrup, 1910 (uncertain > unassessed)
354. Species Melosira pethoei (Pantocsek) (uncertain > unassessed)
355. Species Melosira pfaffiana Reinsch, 1867 (uncertain > unassessed)
356. Species Melosira pileata (Ehrenberg) Kützing accepted as Gaillonella pileata Ehrenberg, 1844 (uncertain > unassessed)
357. Species Melosira plana (Ehrenberg) Kützing, 1849 (uncertain > unassessed)
358. Species Melosira polaris Grunow, 1884 (uncertain > unassessed)
359. Species Melosira polycystinica (Pantocsek) F.W. Mills, 1934 accepted as Paralia polycystinica Pantocsek, 1892 (uncertain > unassessed)
360. Species Melosira polymopha (uncertain > unassessed)
361. Species Melosira polymorpha H.Bethge accepted as Gaillonella italica Ehrenberg, 1838 (uncertain > unassessed)
362. Species Melosira ponderosa K.E. Lohman, 1957 (uncertain > unassessed)
363. Species Melosira pontificalis Brun in Schmidt et al., 1893 (uncertain > unassessed)
364. Species Melosira prae-angustissima Jousé, 1952 (uncertain > unassessed)
365. Species Melosira praeclara Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
366. Species Melosira praegranulata (uncertain > unassessed)
367. Species Melosira praeislandica (uncertain > unassessed)
368. Species Melosira praetermissa V.A.Nikolajev, 1965 † (uncertain > unassessed)
369. Species Melosira pseudoamericana Camburn in Camburn & Kingston, 1986 (uncertain > unassessed)
370. Species Melosira pulchella Hustedt, 1952 (uncertain > unassessed)
371. Species Melosira punctata Grunow in A. Schmidt, 1893 (uncertain > unassessed)
372. Species Melosira puncticulosa Otto Müller, 1903 (uncertain > unassessed)
373. Species Melosira punctigera (Ehrenberg) J.Ralfs accepted as Gaillonella punctigera Ehrenberg, 1842 (uncertain > unassessed)
374. Species Melosira punctissima K.E. Lohman, 1957 (uncertain > unassessed)
375. Species Melosira punctulosa Bethge, 1925 (uncertain > unassessed)
376. Species Melosira pusilla F.Meister, 1913 (uncertain > unassessed)
377. Species Melosira radiata Grunow, 1870 accepted as Cyclotella radiata Brightwell, 1860 (uncertain > unassessed)
378. Species Melosira radiato-sinuata Chen, 1980 (uncertain > unassessed)
379. Species Melosira recedens Schmidt in Schmidt, 1892 (uncertain > unassessed)
380. Species Melosira rieufii Héribaud, 1908 (uncertain > unassessed)
381. Species Melosira robusta Hustedt, 1952 (uncertain > unassessed)
382. Species Melosira roeseana Rabenhorst, 1852 (uncertain > unassessed)
383. Species Melosira roeseana sensu Schmidt et al., 1893 (uncertain > unassessed)
384. Species Melosira rossica (Pantocsek) F.W. Mills, 1934 accepted as Paralia rossica Pantocsek, 1889 (uncertain > unassessed)
385. Species Melosira rostratis Zakrzewski, 1934 (uncertain > unassessed)
386. Species Melosira royatensis VanLandingham, 1971 (uncertain > unassessed)
387. Species Melosira ruttneri Hustedt, 1937 accepted as Angusticopula robusta (Hustedt) Houk et al., 2017 (uncertain > unassessed)
388. Species Melosira samoensis Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
389. Species Melosira sanctae crucis H. Peragallo in Tempère & Peragallo, 1909 (uncertain > unassessed)
390. Species Melosira saratoviana Pantocsek, 1889 (uncertain > unassessed)
391. Species Melosira sarmatica Pantocsek, 1889 (uncertain > unassessed)
392. Species Melosira saturnalis Brun in Schmidt et al., 1892 (uncertain > unassessed)
393. Species Melosira scabrosa Østrup, 1908 (uncertain > unassessed)
394. Species Melosira scala (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella scala Ehrenberg, 1854 (uncertain > unassessed)
395. Species Melosira scalaris Grunow, 1882 † (uncertain > unassessed)
396. Species Melosira schawoi Pantocsek, 1908 (uncertain > unassessed)
397. Species Melosira schroederi J.Woloszynska (uncertain > unassessed)
398. Species Melosira scopos Mann, 1907 (uncertain > unassessed)
399. Species Melosira sculpta (Ehrenberg) Kützing, 1849 accepted as Gaillonella sculpta Ehrenberg, 1845 accepted as Pseudoaulacosira sculpta (Ehrenberg, 1845) Usoltseva & Houk, 2016 † (uncertain > unassessed)
400. Species Melosira selecta Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
401. Species Melosira semilaevis Grunow in Van Heurck, 1882 (uncertain > unassessed)
402. Species Melosira separanda A.W.F.Schmidt (uncertain > unassessed)
403. Species Melosira setosa J.R.Carter, 1966 (uncertain > unassessed)
404. Species Melosira setosa Greville, 1866 accepted as Ferocia setosa Van de Vijver & Houk in Van de Vijver et al., 2017 (uncertain > unassessed)
405. Species Melosira siberica A.W.F.Schmidt, 1892 † (uncertain > unassessed)
406. Species Melosira siberica Skabichevskii, 1963 (uncertain > unassessed)
407. Species Melosira siberica (Grunow in Van Heurck; Grunow) Thum, 1885 accepted as Paralia sulcata f. siberica (Grunow in Van Heurck) Grunow, 1884 accepted as Melosira sulcata f. siberica Grunow in Van Heurck, 1882 (uncertain > unassessed)
408. Species Melosira similis Hustedt, 1942 (uncertain > unassessed)
409. Species Melosira simplex Mann, 1937 (uncertain > unassessed)
410. Species Melosira sinensis Chen, 1980 (uncertain > unassessed)
411. Species Melosira sol sensu Skvortzow, 1937 (uncertain > unassessed)
412. Species Melosira solitoria Manguin ex Kociolek & Reviers, 1996 (uncertain > unassessed)
413. Species Melosira soochowensis Skvortzow, 1946 accepted as Melosira baicalensis f. soochowensis Skvortzov (uncertain > unassessed)
414. Species Melosira sparsepunctata Hajós, 1974 (uncertain > unassessed)
415. Species Melosira sphaerica Héribaud, 1903 (uncertain > unassessed)
416. Species Melosira sphaerica Karsten, 1905 (uncertain > unassessed)
417. Species Melosira spinifera Hustedt, 1927 (uncertain > unassessed)
418. Species Melosira spinosa Pantocsek, 1892 (uncertain > unassessed)
419. Species Melosira spinosa Greville (uncertain > unassessed)
420. Species Melosira spinosa (W. Smith) Brun, 1880 accepted as Orthosira spinosa W.Smith, 1855 (uncertain > unassessed)
421. Species Melosira spinuligera M.Peragallo (uncertain > unassessed)
422. Species Melosira spinulosa Hustedt, 1952 (uncertain > unassessed)
423. Species Melosira spiralis (Ehrenberg) Kützing (uncertain > unassessed)
424. Species Melosira steffanssoni Østrup, 1918 (1920) (uncertain > unassessed)
425. Species Melosira strangulata Héribaud, 1908 (uncertain > unassessed)
426. Species Melosira striata Otto Müller, 1904 (uncertain > unassessed)
427. Species Melosira striata M. Peragallo & Héribaud in Héribaud, 1893 (uncertain > unassessed)
428. Species Melosira subarctica Otto Müller accepted as Melosira italica f. subarctica (Otto Müller) (uncertain > unassessed)
429. Species Melosira subflexilia Kützing, 1833 (uncertain > unassessed)
430. Species Melosira subflexilis Kützing, 1833 (uncertain > unassessed)
431. Species Melosira subflexilis sensu Schmidt in Schmidt et al., 1893 (uncertain > unassessed)
432. Species Melosira subhyalina Van Heurck, 1909 (uncertain > unassessed)
433. Species Melosira subornata Schmidt in Schmidt et al., 1892 (uncertain > unassessed)
434. Species Melosira subsalsa Cleve-Euler, 1912 (uncertain > unassessed)
435. Species Melosira subsetosa Manguin, 1960 (uncertain > unassessed)
436. Species Melosira subtilis Van Goor, 1924 (uncertain > unassessed)
437. Species Melosira sulcata (Ehrenberg) Kützing, 1844 accepted as Gaillonella sulcata Weisse, 1854 (uncertain > unassessed)
438. Species Melosira taeniata (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella taeniata Ehrenberg, 1854 (uncertain > unassessed)
439. Species Melosira tahitiensis Castracane, 1886 (uncertain > unassessed)
440. Species Melosira tcherniae Manguin, 1960 (uncertain > unassessed)
441. Species Melosira tcherniai Manguin, 1957 (uncertain > unassessed)
442. Species Melosira temperei Pantocsek, 1892 (uncertain > unassessed)
443. Species Melosira tenella Nygaard, 1956 (uncertain > unassessed)
444. Species Melosira tenuis Otto Muller ex Lemmermann, 1903 (uncertain > unassessed)
445. Species Melosira tenuissima Grunow, 1882 (uncertain > unassessed)
446. Species Melosira teres Brun, 1892 (uncertain > unassessed)
447. Species Melosira thermalis Meneghini, 1845 (uncertain > unassessed)
448. Species Melosira thompsonii Harvey, 1841 (uncertain > unassessed)
449. Species Melosira thrypsia Barron, 1975 (uncertain > unassessed)
450. Species Melosira thumii Pantocsek, 1889 (uncertain > unassessed)
451. Species Melosira timensis Oksiyuk, 1960 (uncertain > unassessed)
452. Species Melosira trachealis (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella trachealis Ehrenberg, 1854 (uncertain > unassessed)
453. Species Melosira transitus Carter & Denny, 1987 (uncertain > unassessed)
454. Species Melosira transylvanica Pantocsek, 1892 (uncertain > unassessed)
455. Species Melosira triannula K.E. Lohman, 1957 (uncertain > unassessed)
456. Species Melosira tricostata Gleser in Gleser & Posnova, 1964 (uncertain > unassessed)
457. Species Melosira trimorpha (Otto Müller) (uncertain > unassessed)
458. Species Melosira tropica P.L.Crouan & H.M.Crouan (uncertain > unassessed)
459. Species Melosira truncata E.Grove (uncertain > unassessed)
460. Species Melosira tuantianensis C.Huang † (uncertain)
461. Species Melosira tuberculosa Cleve, 1881 (uncertain > unassessed)
462. Species Melosira tubulata Eichwald, 1860 (uncertain > unassessed)
463. Species Melosira turgida Ehrlich, 1973 (uncertain > unassessed)
464. Species Melosira tympanum (Ehrenberg) Kützing, 1849 accepted as Gaillonella tympanum Ehrenberg, 1844 (uncertain > unassessed)
465. Species Melosira valida (Grunow in Van Heurck) Meister, 1912 accepted as Melosira crenulata var. valida Grunow, 1882 (uncertain > unassessed)
466. Species Melosira vangeliana Pantocsek & Greguss in Greguss, 1913 (uncertain > unassessed)
467. Species Melosira vanheurckii M. Peragallo, 1921 (uncertain > unassessed)
468. Species Melosira varennarum M. Peragallo & Héribaud in Héribaud, 1893 (uncertain > unassessed)
469. Species Melosira variabilis McLaughlin in McLaughlin & Stone, 1986 (uncertain > unassessed)
470. Species Melosira variante Agardh, 1832 (uncertain > unassessed)
471. Species Melosira variata Otto Müller (uncertain > unassessed)
472. Species Melosira vetustissima Hajós & Stradner in Hajós, 1974 (uncertain > unassessed)
473. Species Melosira vilida (Grunow) Meister (uncertain > unassessed)
474. Species Melosira vitrea Lohman & Andrews, 1968 (uncertain > unassessed)
475. Species Melosira wildemannii Van Heurck, 1909 (uncertain > unassessed)
476. Species Melosira wrightii O'Meara, 1869 (uncertain > unassessed)
477. Species Melosira yangbajingensis Huang, 1979 (uncertain > unassessed)
478. Species Melosira zachariae Castracane (uncertain > unassessed)
479. Species Melosira zachariasi Castracane, 1894 (uncertain > unassessed)
480. Species Melosira zeileri Grunow in Schmidt et al., 1893 (uncertain > unassessed)

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