DiatomBase
Between brackets is the number of accepted extant species
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- Bacillariophyceae (5 957)
- Subclass Bacillariophyceae incertae sedis (189)
- Subclass Bacillariophycidae (4 408)
- Subclass Coscinodiscophycidae (877)
- Superorder Biddulphianae (230)
- Superorder Chaetocerotanae (95)
- Superorder Corethranae (1)
- Superorder Coscinodiscanae (300)
- Order Arachnoidiscales (4)
- Order Asterolamprales (24)
- Order Aulacoseirales (50)
- Order Chrysanthemodiscales
- Order Coscinodiscales (146)
- Order Ethmodiscales
- Order Melosirales (54)
- Family Endictyaceae
- Family Hyalodiscaceae Crawford, 1990 (6)
- Family Melosiraceae Kützing, 1844, sensu emend. (37)
- Genus Angusticopula Houk et al., 2017 (5)
- Genus Druridgea G.B. De Toni, 1894 (1)
- Genus Ferocia Van de Vijver & Houk in Van de Vijver et al., 2017 (4)
- Genus Gaillionella Bory de Saint-Vincent, 1826 accepted as Gaillonella J.B.M. Bory de Saint-Vincent, 1825
- Genus Melosira C.A. Agardh, 1824 (26)
- Species Melosira accinctus Hohn & Hellerman, 1963
- Species Melosira aculeifera Scheschukova-Poretzkaya in Scheschukova-Poretzkaya & Moissejeva, 1964
- Species Melosira adeliae Manguin, 1957
- Species Melosira aequalis Agardh, 1832
- Species Melosira africana Leuduger-Fortmorel, 1898
- Species Melosira agassizii Ostenfeld, 1909
- Species Melosira agria Pantocsek, 1905
- Species Melosira akkavaarensis Tynni, 1982
- Species Melosira albicans Sheshukova, 1961
- Species Melosira alphabetica Mann, 1937
- Species Melosira alternans Pouchet, 1893
- Species Melosira ambigua (Grunow) O.F.Müller
- Species Melosira americana Kützing, 1844
- Species Melosira anastomosans Grunow in Van Heurck, 1882
- Species Melosira angulata (Gregory) Rabenhorst, 1864 accepted as Orthosira angulata Gregory, 1857
- Species Melosira angustissima Neizvestnova-Zhadina, 1941
- Species Melosira annularis Eichwald, 1847
- Species Melosira anormal Van Heurck, 1882
- Species Melosira antarctica Van Heurck, 1909
- Species Melosira antiqua A.I.Moiseeva, 1963 † accepted as Alveolophora antiqua (A.I.Moisseeva) A.I.Moisseeva, 1990 †
- Species Melosira architecturalis Brun in Schmidt et al., 1892 †
- Species Melosira arctica Dickie, 1852
- Species Melosira arctica (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella arctica (Dickie) Ehrenberg, 1853
- Species Melosira arcuata Pantocsek, 1892
- Species Melosira arenaria Moore ex Ralfs, 1843 accepted as Ellerbeckia arenaria (Moore ex Ralfs) R.M.Crawford, 1988
- Species Melosira arenosa Moore ex Hassall, 1852
- Species Melosira arentii (Kolbe) Nagumo & Kobayasi, 1977 accepted as Cyclotella arentii Kolbe, 1948
- Species Melosira areolata O.Müller, 1904
- Species Melosira areolata A.I.Moissejeva, 1971 accepted as Alveolophora areolata A.I.Moiseeva, 1990 †
- Species Melosira argus Otto Müller, 1904
- Species Melosira arundinacea F.S.Castracane degli Antelminelli
- Species Melosira asiatica Brun in Schmidt et al., 1892 accepted as Cyclotella asiatica Brun in Brun & Tempère, 1889
- Species Melosira astridae D. Metzeltin & H. Lange-Bertalot, 2007
- Species Melosira atlymica Rubina, 1962
- Species Melosira aueri Cleve-Euler, 1948
- Species Melosira bacillosa Otto Müller, 1903
- Species Melosira baicalensis (K.I.Meyer) Wislouch
- Species Melosira baikalensis S.Wislouch, 1924
- Species Melosira baileyi (H.L.Smith) Wolle, 1890 accepted as Cestodiscus baileyi H.L.Smith, 1878 †
- Species Melosira bellicosa Héribaud, 1903
- Species Melosira biharensis Pantocsek, 1886
- Species Melosira binderana Kützing, 1844 accepted as Stephanodiscus binderanus (Kützing) Krieger, 1927
- Species Melosira binderiana (Kützing) Rabenhorst, 1853 accepted as Melosira italica var. binderiana Kützing, 1844
- Species Melosira biseriata (Ehrenberg) Schmidt in Schmidt et al., 1892
- Species Melosira bituminosa Pantocsek
- Species Melosira biwae Mori, 1974
- Species Melosira bongrainii M. Peragallo, 1921
- Species Melosira borreri Greville, 1833
- Species Melosira borreri sensu Wyatt
- Species Melosira borrerii
- Species Melosira bottnica Grunow in Cleve & Möller, 1879
- Species Melosira boulayana Peragallo in Héribaud, 1902
- Species Melosira brandinii L.F.Fernandes & R.M.Souza-Mosimann, 2001
- Species Melosira bruni M.Peragallo & Héribaud-Joseph
- Species Melosira californica (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella californica Ehrenberg, 1852
- Species Melosira caliginosa Hanna, 1927
- Species Melosira calligera (Ehrenberg) Kützing, 1849 accepted as Gaillonella calligera Ehrenberg, 1845
- Species Melosira campaniensis Moshkovitz, Ehrlich & Soudry, 1983
- Species Melosira campylosira (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella campylosira Ehrenberg, 1854
- Species Melosira camusi Héribaud-Joseph
- Species Melosira canadensis Hustedt, 1952
- Species Melosira canalifera J.-J.Brun & Héribaud-Joseph
- Species Melosira caputmedusae Pantocsek, 1886
- Species Melosira carconensis Grunow in Van Heurck, 1882
- Species Melosira caspica Henckel, 1909
- Species Melosira castracani (Brun) Tsumura, 1967 accepted as Cyclotella castracani Brun, 1891
- Species Melosira cataractarum F.Hustedt accepted as Nanofrustulum cataractarum (Hust.) C.E.Wetzel, E.Morales & Ector, 2019
- Species Melosira catenata Brun, 1895
- Species Melosira charcotii M. Peragallo, 1921
- Species Melosira cincta Pantocsek, 1886
- Species Melosira circularis (Ehreb.) Ralfs, 1861 accepted as Gaillonella circularis Ehrenberg, 1854
- Species Melosira circulata
- Species Melosira clavigera Grunow in Van Heurck, 1882
- Species Melosira clypeus J. Brun in Brun & Tempère, 1889
- Species Melosira coarctata (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella coarctata Ehrenberg, 1843
- Species Melosira complexa Lohman, 1948
- Species Melosira concatenata (Kützing) Rabenhorst, 1864 accepted as Melosira salina var. concatenata Kützing, 1844
- Species Melosira concentrica (A.Schmidt) J.Fenner accepted as Paralia concentrica Schmidt in Schmidt et al., 1892
- Species Melosira concinna Castracane, 1866
- Species Melosira constricta Akimova, 1940
- Species Melosira cornuta Tempère & Brun in Brun & Tempère, 1889
- Species Melosira coronaria Mann, 1907
- Species Melosira coronaria M. Peragallo in Peragallo & Peragallo, 1911
- Species Melosira coronata (Ehrenberg) Kützing
- Species Melosira coronata sensu Kutzing, 1849
- Species Melosira costata Greville, 1866
- Species Melosira crassa K.E. Lohman, 1957
- Species Melosira crenata (Ehrenberg) Cramer, 1868 accepted as Gaillonella crenata Ehrenberg, 1844
- Species Melosira crenulata (Ehrenberg) Kützing, 1844 accepted as Gaillonella crenulata var. crenulata Ehrenberg, 1843
- Species Melosira crenulata Cleve & Möller
- Species Melosira crenulatata
- Species Melosira cretacea Jousé, 1951
- Species Melosira cribrosa Brebisson in W. Smith, 1857
- Species Melosira cristata Pantocsek, 1889
- Species Melosira crotonensis (J.W. Bailey) H.L. Smith, 1876 accepted as Gaillonella crotonensis J.W. Bailey, 1854
- Species Melosira crotonensis sensu Wolle, 1890
- Species Melosira crucicula G.B.De Toni
- Species Melosira crucipunctata Bachmann, 1936
- Species Melosira csakyana Pantocsek, 1913
- Species Melosira cucullata Chen, 1980
- Species Melosira curvatula Janisch in Schmidt et al., 1892
- Species Melosira cycola Ehrenberg
- Species Melosira dactylus (Ehrenberg) Tempère & Peragallo, 1914
- Species Melosira davidsonii Schmidt in Schmidt et al., 1893
- Species Melosira de vriesii Otto Müller, 1903
- Species Melosira deblockii H.F.Van Heurck
- Species Melosira debyi (Pantocsek) F.W. Mills, 1934 accepted as Paralia debyi Pantocsek, 1892
- Species Melosira debyi (Pantocsek) Jurilj, 1957 accepted as Paralia debyi Pantocsek, 1892
- Species Melosira decipiens Grove in Schmidt et al., 1893
- Species Melosira decussata (Ehrenberg) Kützing
- Species Melosira dendrophila (Ehrenberg) R.Ross & P.A.Sims, 1978
- Species Melosira dendroteres (Ehrenberg) R.Ross, 1947 accepted as Orthoseira dendroteres (Ehrenberg) F.E.Round, R.M.Crawford & D.G.Mann, 1990
- Species Melosira densserrae Long, Fuge & Smith, 1946
- Species Melosira dentata H.L. Smith, 1884
- Species Melosira denticulata K.E. Lohman, 1957
- Species Melosira dewildemanii Van Heurck, 1909
- Species Melosira dickiei (Thwaites) Kützing, 1849
- Species Melosira discigera Agardh, 1824
- Species Melosira dispersa Carter, 1966
- Species Melosira distans (Ehrenberg) Kützing, 1844 accepted as Aulacoseira distans (Ehrenberg) Simonsen, 1979 †
- Species Melosira distans (Grunow in Van Heurck) Skabichevskii, 1960 accepted as Melosira distans f. alpigena Grunow in Van Heurck, 1882
- Species Melosira dougetii Manguin, 1957
- Species Melosira dozyana Kützing
- Species Melosira dubia Kützing, 1844
- Species Melosira duplicata Schmidt in Schmidt et al., 1893
- Species Melosira dura Mann, 1925
- Species Melosira echinata E.E.Manguin
- Species Melosira echinus Frenguelli, 1938 accepted as Pseudopodosira echinus (Frenguelli) D. Metzeltin, H. Lange-Bertalot & F. García-Rodríguez, 2005 †
- Species Melosira elegans Mukhina in Jousé & Mukhina, 1978
- Species Melosira elongata Jousé, 1966
- Species Melosira epidendron (Ehrenberg) Boyer, 1927 accepted as Stephanosira epidendron Ehrenberg, 1848
- Species Melosira excentrica Pantocsek, 1892
- Species Melosira excurrens Nygaard, 1956
- Species Melosira exspectata Schmidt in Schmidt et al., 1892
- Species Melosira fausta A.W.F.Schmidt, 1892 †
- Species Melosira febigerii (Grunow in Cleve & Grunow) Mann, 1907 accepted as Podosira febigeri Grunow in Cleve & Grunow, 1880
- Species Melosira fennoscandica Cleve-Euler, 1943
- Species Melosira ferox Schmidt in Schmidt et al., 1892
- Species Melosira forolivensis Forti in Tempère & Peragallo, 1914
- Species Melosira fragilis (Roth) Kützing, 1833
- Species Melosira franklinii (Ehrenberg) Cleve, 1868 accepted as Craspedodiscus franklinii Ehrenberg, 1853
- Species Melosira frigida Jousé, 1959
- Species Melosira fungiformis Pantocsek, 1892
- Species Melosira gallica (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella gallica Ehrenberg, 1836
- Species Melosira gardneri I.Kaczmarska, 1985 †
- Species Melosira garganica Rabenhorst, 1853
- Species Melosira gelida Cleve, 1883
- Species Melosira geometrica Hanna, 1932
- Species Melosira gessneri F.Hustedt, 1965
- Species Melosira glacialis (Grunow) Cleve-Euler, 1951 accepted as Podosira hormoides var. glacialis Grunow, 1884
- Species Melosira globifera (D.Carmichael) Harvey
- Species Melosira glomus F.C.Castracane degli Antelminelli
- Species Melosira godfroyi M. Peragallo, 1921
- Species Melosira goetzeana O.Müller
- Species Melosira goretzkyi Tscheremissinova, 1956
- Species Melosira gothica Cleve-Euler, 1951
- Species Melosira gowenii Schmidt in Schmidt et al., 1892
- Species Melosira grandis Perty, 1852
- Species Melosira granulata (Ehrenberg) Ralfs, 1861 accepted as Aulacoseira granulata (Ehrenberg) Simonsen, 1979
- Species Melosira granulata auct. non (Ehrenberg)
- Species Melosira granulata Otto Müller, 1903
- Species Melosira granulata sensu L.W. Bailey, 1861
- Species Melosira granulata Otto Müller, 1903
- Species Melosira granulata (Otto Müller) Skabichevskii, 1960 accepted as Melosira granulata f. angustissima Otto Müller, 1899
- Species Melosira granulata (Otto Müller) Cleve-Euler, 1938 accepted as Melosira granulata f. angustissima Otto Müller, 1899
- Species Melosira granulata Otto Müller, 1904
- Species Melosira granulata Otto Müller, 1904
- Species Melosira granulosa O.Müller
- Species Melosira grovei Schmidt in Schmidt et al., 1892
- Species Melosira guillauminii Manguin ex Kociolek & Reviers, 1996
- Species Melosira halophila (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella halophila Ehrenberg, 1854
- Species Melosira haradaae Pantocsek, 1892
- Species Melosira helvetica (O.F.Müller) Cleve-Euler, 1911
- Species Melosira helvetica Ailio, 1915
- Species Melosira heribaudii Brun in A. Schmidt, 1893
- Species Melosira herzogii Lemmermann
- Species Melosira hetrurica Kützing, 1844
- Species Melosira heufleri G.G.A.Meneghini
- Species Melosira hibschii Reichelt, 1897-1900
- Species Melosira hispanica Hajós, 1982
- Species Melosira hispida H. Peragallo, 1888
- Species Melosira hispida C.Janisch
- Species Melosira hispida sensu Schmidt in Schmidt et al., 1893
- Species Melosira hokkaidoana Pantocsek, 1892
- Species Melosira hormoides Montagne, 1939
- Species Melosira horologium (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella horologium Ehrenberg, 1843
- Species Melosira hummii Hustedt, 1955
- Species Melosira hungarica Schmidt in Schmidt et al., 1892
- Species Melosira hungarica Pantocsek, 1892
- Species Melosira hustedti Krasske, 1939 accepted as Melosira hustedtii Krasske, 1939
- Species Melosira hustedtii Krasske, 1939
- Species Melosira hyalina Sypniewsky, 1860
- Species Melosira hyalina Castracane, 1886
- Species Melosira hyalina Karsten, 1905
- Species Melosira hyalina K.E. Lohman, 1957
- Species Melosira hyalinula De Toni, 1894
- Species Melosira hyperborea Grunow, 1882
- Species Melosira ignota Rubina, 1962
- Species Melosira ikapoensis Otto Müller, 1904 accepted as Aulacoseira ikapoensis (Otto Müller) Simonsen, 1979
- Species Melosira imperfecta Héribaud, 1903
- Species Melosira incertum Leuduger-Fortmorel, 1898
- Species Melosira incompta Mann, 1925
- Species Melosira incorrupta Carter, 1966
- Species Melosira indica Skvortzov
- Species Melosira inflexa (Roth) Guiry, 2019
- Species Melosira inordinata Lohman & Andrews, 1968
- Species Melosira interjecta (Janisch in Schmidt et al.) De Toni, 1894 accepted as Orthosira interjecta Janisch in Schmidt et al., 1892
- Species Melosira interrupta Lohman & Andrews, 1968
- Species Melosira irregularis (Eichwald) Eichwald, 1847 accepted as Gaillonella irregularis Eichwald, 1844
- Species Melosira irregularis Pantocsek, 1889
- Species Melosira irregularis O.Müller
- Species Melosira islandica O.F.Müller, 1906
- Species Melosira islandica Cleve-Euler, 1938
- Species Melosira italica (Ehrenberg) Kützing, 1844
- Species Melosira italica Komarenko, 1956
- Species Melosira italica Hustedt, 1942
- Species Melosira italica (Grunow) Skabichevskii, 1960 accepted as Melosira italica var. valida Grunow, 1881
- Species Melosira italica Otto Müller, 1906
- Species Melosira italica Otto Müller, 1906
- Species Melosira italica (Grunow) Cleve-Euler, 1938 accepted as Melosira crenulata var. ambigua Grunow, 1882
- Species Melosira japonica Pantocsek, 1892
- Species Melosira japonica F.Meister, 1913
- Species Melosira jeanbertrandiana Van de Vijver & Crawford
- Species Melosira jenyssejana Henckel, 1926
- Species Melosira jilinensis Huang in Huang et al., 1983 †
- Species Melosira johnesii Meyer, 1925
- Species Melosira jouseana Moissejeva, 1971 † accepted as Alveolophora jouseana (A.I.Moiseeva) A.I.Moiseeva, 1990 †
- Species Melosira juergensi C. Agardh, 1824 accepted as Melosira lineata (Dillwyn) C.Agardh, 1824
- Species Melosira juergensii C.Agardh, 1824 accepted as Melosira lineata (Dillwyn) C.Agardh, 1824
- Species Melosira juergensii sensu Vanhoffen, 1897
- Species Melosira jüergensii
- Species Melosira jurgensi
- Species Melosira jurgensii Kützing
- Species Melosira jutlandica Grunow
- Species Melosira kamtschatica Grunow ex Cleve & Moller, 1877
- Species Melosira karelica Mölder, 1951
- Species Melosira karsteni Mangin, 1915
- Species Melosira kochii Pantocsek, 1892
- Species Melosira kondeensis Otto Müller, 1904
- Species Melosira labuensis Cleve, 1883
- Species Melosira lacustris Chase, 1886
- Species Melosira laevis (Ehrenberg) J.Ralfs
- Species Melosira laevissima Grunow, 1882
- Species Melosira laminaris (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella laminaris Ehrenberg, 1854
- Species Melosira lauterbornii Pantocsek, 1908
- Species Melosira lentigera (Carmichael) Harvey
- Species Melosira lineata (Dillwyn) C.Agardh, 1824
- Species Melosira lineolata sensu Grunow, 1884
- Species Melosira lirata (Ehrenberg) Kützing, 1844
- Species Melosira loczyi Pantocsek, 1889
- Species Melosira lolia Hanna, 1927
- Species Melosira longispina Hustedt, 1942 accepted as Aulacoseira subarctica var. longispina (Hustedt) A.Tuji & A.Houki, 2004
- Species Melosira lucida Cleve-Euler, 1939
- Species Melosira lyrata Ehrenberg
- Species Melosira lyrata Grunow in A. Schmidt, 1893
- Species Melosira maculata Lagerst., 1876 accepted as Podosira maculata W.Smith, 1856
- Species Melosira madagascariensis Schmidt in Schmidt et al., 1893
- Species Melosira magnusii Otto Müller, 1904
- Species Melosira major Grove in Schmidt et al., 1892
- Species Melosira marchica (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella marchica Ehrenberg, 1843
- Species Melosira mareei Kufferath, 1956
- Species Melosira margarita K.E. Lohman, 1957
- Species Melosira marginata Hajós, 1968
- Species Melosira marina (W.Smith) Janisch, 1862 accepted as Orthosira marina W. Smith, 1856
- Species Melosira mauryana Héribaud-Joseph
- Species Melosira mbasiensis Otto Müller, 1904
- Species Melosira mediterranea Grunow in Van Heurck, 1882
- Species Melosira medusa Mann, 1907
- Species Melosira melinitica Pantocsek, 1886
- Species Melosira mesodon (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella mesodon Ehrenberg, 1854
- Species Melosira mexicana Grunow ex Cleve & Möller, 1878
- Species Melosira micropunctata K.E. Lohman, 1957
- Species Melosira mikkelsenii Nygaard, 1956
- Species Melosira miniliformis
- Species Melosira minima Hajós, 1968
- Species Melosira minuta Héribaud, 1903
- Species Melosira minutula F.J.Chauvin
- Species Melosira miocaenica E.A.Cheremisinova
- Species Melosira mirabilis Brun in Schmidt et al., 1892
- Species Melosira moisseevae Lupikina, 1984
- Species Melosira moniliformis (O.F.Müller) C.Agardh, 1824
- Species Melosira monoliformis (O.F. Müller) C. Agardh, 1824 accepted as Melosira moniliformis (O.F.Müller) C.Agardh, 1824
- Species Melosira monospina
- Species Melosira montagnei (Kützing) N.G.W.Lagerstedt
- Species Melosira mucosa Manguin, 1915
- Species Melosira muelleri VanLandingham, 1971
- Species Melosira muscigena Iwahashi, 1936
- Species Melosira mutabilis Otto Müller
- Species Melosira muzzanensis Meister, 1912
- Species Melosira naegeli Ralfs in Pritchard, 1861
- Species Melosira natans Hilse, 1863
- Species Melosira neocaledonica Manguin, 1962
- Species Melosira neocaledonica Kociolek & Reviers
- Species Melosira neogena Pantocsek, 1913
- Species Melosira neosphaerica VanLandingham, 1971
- Species Melosira neostriata VanLandingham, 1971
- Species Melosira nivalis W.Smith, 1855
- Species Melosira nobilis Greville, 1865
- Species Melosira normannii Arnott in Van Heurck, 1882
- Species Melosira nuda Hajós, 1959
- Species Melosira nuda K.E. Lohman, 1957
- Species Melosira nummuloides C.Agardh, 1824 accepted as Melosira discigera Agardh, 1824
- Species Melosira nummuloides Greville
- Species Melosira nummuloides W. Smith
- Species Melosira nummuloides sensu Vanhoffen, 1897
- Species Melosira nummulus A.F.Meunier, 1915
- Species Melosira numulina Agardh
- Species Melosira nyassensis Otto Müller, 1904
- Species Melosira nygaardii Camburn, 1986
- Species Melosira oamaruensis Grove & Sturt, 1887
- Species Melosira oceanica (Ehrenberg; Ehrenberg) Leuduger-Fortmorel, 1879 accepted as Endictya oceanica Ehrenberg, 1845
- Species Melosira ochracea (A.W.Roth) J.Ralfs
- Species Melosira octogona A.W.F.Schmidt, 1893
- Species Melosira oculus (Ehrenberg) Kützing
- Species Melosira oculuschamaeleontis Ehernberg, 1844 (1845)
- Species Melosira oestrupi Cleve-Euler, 1910
- Species Melosira omma Cleve
- Species Melosira orbifera Brun in Schmidt et al., 1892
- Species Melosira ordinata (Kützing)
- Species Melosira orichalcea (Mertens ex Jürgens) Kützing, 1833
- Species Melosira orichalcea sensu Brun, 1880
- Species Melosira ornata Grunow
- Species Melosira ornata auct. non Grunow, 1884
- Species Melosira ostrupi A. Cleve
- Species Melosira ostrupii Héribaud in Héribaud et al., 1920
- Species Melosira pantocseki (Van Heurck) Frenguelli, 1960 accepted as Hyalodiscus pantocsekii var. pantocsekii Van Heurck, 1909
- Species Melosira papilio Mukhina in Jousé & Mukhina, 1978
- Species Melosira papillifera Hendey, 1972
- Species Melosira patagonica (Otto Müller) Cleve-Euler accepted as Melosira lineolata var. patagonica Otto Müller, 1909
- Species Melosira patera J.A. Long, D.P. Fuge & J. Smith, 1946
- Species Melosira paucipunctata K.E. Lohman, 1957
- Species Melosira pella Lohman & Andrews, 1968
- Species Melosira pensacolae Schmidt in Schmidt et al., 1893
- Species Melosira peragalloii Pantocsek, 1892
- Species Melosira perglabra Østrup, 1910
- Species Melosira perpusilla Frenguelli, 1923
- Species Melosira pethoei (Pantocsek)
- Species Melosira pfaffiana Reinsch, 1867
- Species Melosira pileata (Ehrenberg) Kützing accepted as Gaillonella pileata Ehrenberg, 1844
- Species Melosira plana (Ehrenberg) Kützing, 1849
- Species Melosira polaris Grunow, 1884
- Species Melosira polycystinica (Pantocsek) F.W. Mills, 1934 accepted as Paralia polycystinica Pantocsek, 1892
- Species Melosira polymopha
- Species Melosira polymorpha H.Bethge accepted as Gaillonella italica Ehrenberg, 1838
- Species Melosira ponderosa K.E. Lohman, 1957
- Species Melosira pontificalis Brun in Schmidt et al., 1893
- Species Melosira prae-angustissima Jousé, 1952
- Species Melosira praeclara Schmidt in Schmidt et al., 1892
- Species Melosira praedistans
- Species Melosira praegranulata
- Species Melosira praeislandica
- Species Melosira praetermissa V.A.Nikolajev, 1965 †
- Species Melosira pseudoamericana Camburn in Camburn & Kingston, 1986
- Species Melosira pseudogranulata Cleve-Euler, 1948 accepted as Aulacoseira pseudogranulata (Cleve-Euler) Simonsen, 1979
- Species Melosira pulchella Hustedt, 1952
- Species Melosira punctata (W.Smith) J.Dannf., 1882
- Species Melosira punctata Grunow in A. Schmidt, 1893
- Species Melosira puncticulosa Otto Müller, 1903
- Species Melosira punctigera (Ehrenberg) J.Ralfs accepted as Gaillonella punctigera Ehrenberg, 1842
- Species Melosira punctissima K.E. Lohman, 1957
- Species Melosira punctulosa Bethge, 1925
- Species Melosira pusilla F.Meister, 1913
- Species Melosira pyxis Otto Müller
- Species Melosira radiata Grunow, 1870 accepted as Cyclotella radiata Brightwell, 1860
- Species Melosira radiato-sinuata Chen, 1980
- Species Melosira recedens Schmidt in Schmidt, 1892
- Species Melosira rieufii Héribaud, 1908
- Species Melosira robusta Hustedt, 1952
- Variety Melosira robusta var. kokariensis Foged, 1985
- Species Melosira roeseana Rabenhorst, 1852
- Species Melosira roeseana sensu Schmidt et al., 1893
- Species Melosira roseana Rabenhorst
- Species Melosira rossica (Pantocsek) F.W. Mills, 1934 accepted as Paralia rossica Pantocsek, 1889
- Species Melosira rostratis Zakrzewski, 1934
- Species Melosira royatensis VanLandingham, 1971
- Species Melosira ruttneri Hustedt, 1937 accepted as Angusticopula robusta (Hustedt) Houk et al., 2017
- Species Melosira salina Kützing, 1844
- Species Melosira samoensis Schmidt in Schmidt et al., 1892
- Species Melosira sanctae crucis H. Peragallo in Tempère & Peragallo, 1909
- Species Melosira saratoviana Pantocsek, 1889
- Species Melosira sarmatica Pantocsek, 1889
- Species Melosira saturnalis Brun in Schmidt et al., 1892
- Species Melosira scabrosa Østrup, 1908
- Species Melosira scala (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella scala Ehrenberg, 1854
- Species Melosira scalaris Grunow, 1882 †
- Species Melosira schawoi Pantocsek, 1908
- Species Melosira schroederi J.Woloszynska
- Species Melosira scopos Mann, 1907
- Species Melosira sculpta (Ehrenberg) Kützing, 1849 accepted as Gaillonella sculpta Ehrenberg, 1845
- Species Melosira selecta Schmidt in Schmidt et al., 1892
- Species Melosira semilaevis Grunow in Van Heurck, 1882
- Species Melosira separanda A.W.F.Schmidt
- Species Melosira setosa Greville, 1866 accepted as Ferocia setosa Van de Vijver & Houk in Van de Vijver et al., 2017
- Species Melosira setosa J.R.Carter, 1966
- Species Melosira siberica A.W.F.Schmidt, 1892 †
- Species Melosira siberica Skabichevskii, 1963
- Species Melosira siberica (Grunow in Van Heurck; Grunow) Thum, 1885 accepted as Paralia sulcata f. siberica (Grunow in Van Heurck) Grunow, 1884
- Species Melosira similis Hustedt, 1942
- Species Melosira simplex Mann, 1937
- Species Melosira sinensis Chen, 1980
- Species Melosira sol Kützing, 1849
- Species Melosira sol sensu Skvortzow, 1937
- Species Melosira solida Eulenstein, 1882 accepted as Aulacoseira solida (Eulenstein) K.Krammer, 1991 †
- Species Melosira solitoria Manguin ex Kociolek & Reviers, 1996
- Species Melosira soochowensis Skvortzow, 1946 accepted as Melosira baicalensis f. soochowensis Skvortzov
- Species Melosira sparsepunctata Hajós, 1974
- Species Melosira sphaerica Héribaud, 1903
- Species Melosira sphaerica Karsten, 1905
- Species Melosira spinifera Hustedt, 1927
- Species Melosira spinosa Pantocsek, 1892
- Species Melosira spinosa Greville
- Species Melosira spinosa (W. Smith) Brun, 1880 accepted as Orthosira spinosa W.Smith, 1855
- Species Melosira spinuligera M.Peragallo
- Species Melosira spinulosa Hustedt, 1952
- Species Melosira spiralis (Ehrenberg) Kützing
- Species Melosira steffanssoni Østrup, 1918 (1920)
- Species Melosira strangulata Héribaud, 1908
- Species Melosira striata Otto Müller, 1904
- Species Melosira striata M. Peragallo & Héribaud in Héribaud, 1893
- Species Melosira subarctica Otto Müller accepted as Melosira italica f. subarctica (Otto Müller)
- Species Melosira subflexilia Kützing, 1833
- Species Melosira subflexilis Kützing, 1833
- Species Melosira subflexilis sensu Schmidt in Schmidt et al., 1893
- Species Melosira subhyalina Van Heurck, 1909
- Species Melosira subornata Schmidt in Schmidt et al., 1892
- Species Melosira subsalsa Cleve-Euler, 1912
- Species Melosira subsetosa Manguin, 1960
- Species Melosira subtilis Van Goor, 1924
- Species Melosira sulcata (Ehrenberg) Kützing, 1844 accepted as Gaillonella sulcata Weisse, 1854
- Species Melosira taeniata (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella taeniata Ehrenberg, 1854
- Species Melosira tahitiensis Castracane, 1886
- Species Melosira tcherniae Manguin, 1960
- Species Melosira tcherniai Manguin, 1957
- Species Melosira temperei Pantocsek, 1892
- Species Melosira tenella Nygaard, 1956
- Species Melosira tenuis Otto Muller ex Lemmermann, 1903
- Species Melosira tenuissima Grunow, 1882
- Species Melosira teres Brun, 1892
- Species Melosira thaitiensis F.S.Castracane degli Antelminelli accepted as Melosira tahitiensis Castracane, 1886
- Species Melosira thermalis Meneghini, 1845
- Species Melosira thompsonii Harvey, 1841
- Species Melosira thrypsia Barron, 1975
- Species Melosira thumii Pantocsek, 1889
- Species Melosira timensis Oksiyuk, 1960
- Species Melosira trachealis (Ehrenberg) Ralfs in Pritchard, 1861 accepted as Gaillonella trachealis Ehrenberg, 1854
- Species Melosira transitus Carter & Denny, 1987
- Species Melosira transylvanica Pantocsek, 1892
- Species Melosira triannula K.E. Lohman, 1957
- Species Melosira tricostata Gleser in Gleser & Posnova, 1964
- Species Melosira trimorpha (Otto Müller)
- Species Melosira tropica P.L.Crouan & H.M.Crouan
- Species Melosira truncata E.Grove
- Species Melosira tuberculosa Cleve, 1881
- Species Melosira tubulata Eichwald, 1860
- Species Melosira turgida Ehrlich, 1973
- Species Melosira tympanum (Ehrenberg) Kützing, 1849 accepted as Gaillonella tympanum Ehrenberg, 1844
- Species Melosira undulata (Ehrenberg) Kützing, 1844
- Species Melosira valida (Grunow in Van Heurck) Meister, 1912 accepted as Melosira crenulata var. valida Grunow, 1882
- Species Melosira vangeliana Pantocsek & Greguss in Greguss, 1913
- Species Melosira vanheurckii M. Peragallo, 1921
- Species Melosira varennarum M. Peragallo & Héribaud in Héribaud, 1893
- Species Melosira variabilis McLaughlin in McLaughlin & Stone, 1986
- Species Melosira varians C.Agardh, 1827
- Species Melosira variante Agardh, 1832
- Species Melosira variata Otto Müller
- Species Melosira vetustissima Hajós & Stradner in Hajós, 1974
- Species Melosira vilida (Grunow) Meister
- Species Melosira vitrea Lohman & Andrews, 1968
- Species Melosira westii W.Smith, 1856 accepted as Pseudopodosira westii (W.Smith) Sheshukova-Poretzskaya & Glezer, 1964 †
- Species Melosira wildemannii Van Heurck, 1909
- Species Melosira wrightii O'Meara, 1869
- Species Melosira yangbajingensis Huang, 1979
- Species Melosira youngi Skvortzov
- Species Melosira zachariae Castracane
- Species Melosira zachariasi Castracane, 1894
- Species Melosira zeileri Grunow in Schmidt et al., 1893
- Variety Melosira var. tenella (Nygaard) accepted as Aulacoseira distans var. tenella (Nygaard) R.Ross, 1986
- Genus Pseudopodosira A.P. Jousé in A.I. Proschkina-Lavrenko, 1949 (1)
- Genus Schroederella J. Pavillard, 1913
- Family Stephanopyxidaceae Nikolaev (11)
- Order Orthoseirales (18)
- Order Paraliales (4)
- Order Stictocycales
- Order Stictodiscales
- Superorder Cymatosirophycanae (10)
- Superorder Lithodesmiophycanae (7)
- Superorder Rhizosolenianae (37)
- Superorder Thalassiosiranae (192)
- Order Arcanodiscales (5)
- Order Stictocyclales
- Subclass Fragilariophycidae (483)
- Order Centrales
