Acartiidae G.O. Sars, 1903 (habitat flag source)
Achnanthes brevipes C. Agardh, 1824 (habitat flag source)
Achnanthes clevei Grunow, 1880 (habitat flag source)
Achnanthes coarctata (Brébisson) Grunow, 1880 (habitat flag source)
Achnanthes delicatula (Kützing) Grunow, 1880 (habitat flag source)
Achnanthes exigua Grunow, 1880 (habitat flag source)
Achnanthes hungarica (Grunow) Grunow, 1880 (habitat flag source)
Achnanthes intermedia Kützing, 1833 accepted as Achnanthes brevipes C. Agardh, 1824 (habitat flag source)
Achnanthes lanceolata (Brébisson ex Kützing) Grunow, 1880 (habitat flag source)
Achnanthes levanderi Hustedt, 1933 (habitat flag source)
Achnanthes linearis (W. Smith) Grunow, 1880 (habitat flag source)
Achnanthes longipes C. Agardh, 1824 (habitat flag source)
Achnanthes minutissima Kützing, 1833 (habitat flag source)
Achnanthes oblongella Østrup, 1902 (habitat flag source)
Achnanthes subsalsa J.B. Petersen, 1928 (habitat flag source)
Achnanthidium microcephalum Kützing, 1844 accepted as Achnanthes microcephala (Kützing) Cleve, 1895 (habitat flag source)
Actinoptychus senarius (Ehrenberg) Ehrenberg, 1843 (habitat flag source)
Acuariidae Railliet, Henry & Sisoff, 1912 (habitat flag source)
Amphimonadaceae accepted as Amphimonadidae (habitat flag source)
Amphipleura pellucida (Kützing) Kützing, 1844 (habitat flag source)
Amphiprora costata Hustedt, 1930 (habitat flag source)
Amphiprora lata Greville (habitat flag source)
Amphora arenaria Donkin, 1858 (habitat flag source)
Amphora coffeaeformis (C. Agardh) Kützing, 1844 (habitat flag source)
Amphora holsatica Hustedt, 1925 (habitat flag source)
Amphora hyalina Kützing, 1844 (habitat flag source)
Amphora libyca Ehrenberg, 1840 (habitat flag source)
Amphora normanii Rabenhorst emend. Carter & F.E. Round, 1993 (habitat flag source)
Amphora obtusa W. Gregory, 1857 (habitat flag source)
Amphora ovalis (Kützing) Kützing, 1844 (habitat flag source)
Amphora pediculus (Kützing) Grunow ex A. Schmidt, 1875 (habitat flag source)
Amphora perpusilla Grunow, 1884 (habitat flag source)
Amphora turgida W. Gregory, 1857 (habitat flag source)
Amphora veneta Kützing, 1844 (habitat flag source)
Amphora ventricosa W. Gregory, 1857 (habitat flag source)
Anabaena circinalis Rabenhorst, 1863 (habitat flag source)
Anabaena constricta (Szafer) Geitler, 1925 accepted as Komvophoron constrictum (Szafer) Anagnostidis & Komárek, 1988 (habitat flag source)
Anabaena crassa (Lemmermann) Komark.-Legn. & Cronberg, 1992 (habitat flag source)
Anabaena spiroides Klebahn, 1895 (habitat flag source)
Anabaena torulosa Lagerheim ex Bornet & Flahault, 1886 (habitat flag source)
Andrassyidae Tchesunov & Gagarin, 1999 (habitat flag source)
Anomoeoneis serians (Brébisson) Cleve, 1895 (habitat flag source)
Anomoeoneis sphaerophora E. Pfitzer, 1871 (habitat flag source)
Aphanocapsa elachista W. West & G.S. West, 1894 accepted as Microcystis elachista (W. West & G.S. West) Compère, 1967 (habitat flag source)
Aphanochaete repens A. Braun, 1850 (habitat flag source)
Aphanothece castagnei (Brébisson) Rabenhorst, 1865 (habitat flag source)
Aphanothece clathrata W. West & G.S. West, 1906 (habitat flag source)
Aphanothece microscopica Nägeli, 1849 (habitat flag source)
Aphanothece saxicola Nägeli, 1849 (habitat flag source)
Aphanothece stagnina (Sprengel) A. Braun, 1863 (habitat flag source)
Ascaridae Baird, 1853 accepted as Ascarididae Baird, 1853 (habitat flag source)
Asterionella formosa Hassall, 1850 (habitat flag source)
Aulacoseira alpigena (Grunow) Krammer, 1991 (habitat flag source)
Aulacoseira crenulata (Ehrenberg) Thwaites, 1848 (habitat flag source)
Aulacoseira distans (Ehrenberg) Simonsen, 1979 (habitat flag source)
Aulacoseira granulata (Ehrenberg) Simonsen, 1979 accepted as Melosira granulata (Ehrenberg) Ralfs, 1861 (habitat flag source)
Aulacoseira italica (Ehrenberg) Simonsen, 1979 accepted as Melosira italica (Ehrenberg) Kützing, 1844 (habitat flag source)
Aulacoseira lirata (Ehrenberg) R. Ross (habitat flag source)
Aulacoseira subarctica (O.F. Müller) E.Y. Haworth, 1988 accepted as Melosira italica (Ehrenberg) Kützing, 1844 (habitat flag source)
Aulacoseira valida (Grunow) Krammer (habitat flag source)
Bacillaria paradoxa J.F. Gmelin, 1791 accepted as Bacillaria paxillifer (O.F. Müller) T. Marsson, 1901 (habitat flag source)
Berkeleya fragilis Greville, 1823 (habitat flag source)
Blidingia minima (Nägeli ex Kützing) Kylin, 1947 (habitat flag source)
Brachysira brebissonii R. Ross, 1986 (habitat flag source)
Brachysira serians (Brébisson) F.E. Round & D.G. Mann, 1981 (habitat flag source)
Brachysira vitrea (Grunow) R. Ross, 1986 (habitat flag source)
Caloneis amphisbaena (Bory de Saint Vincent) Cleve, 1894 (habitat flag source)
Caloneis bacillum (Grunow) Cleve, 1894 (habitat flag source)
Caloneis molaris (Grunow) Krammer, 1985 (habitat flag source)
Caloneis permagna (J.W. Bailey) Cleve, 1894 (habitat flag source)
Caloneis schumanniana (Grunow) Cleve, 1894 (habitat flag source)
Caloneis silicula (Ehrenberg) Cleve, 1894 (habitat flag source)
Caloneis ventricosa (Ehrenberg) F. Meister, 1912 accepted as Caloneis silicula (Ehrenberg) Cleve, 1894 (habitat flag source)
Calothrix confervicola C. Agardh ex Bornet & Flahault, 1886 (habitat flag source)
Campylodiscus bicostatus W. Smith, 1854 (habitat flag source)
Candonidae Kaufmann, 1900 (habitat flag source)
Capillariidae Railliet, 1915 (habitat flag source)
Cavinula lacustris (W. Gregory) D.G. Mann & Stickle, 1990 (habitat flag source)
Cavinula pseudoscutiformis (Hustedt) D.G. Mann & A.J. Stickle, 1990 (habitat flag source)
Cavinula variostriata (Krasske) D.G. Mann & A.J. Stickle, 1990 (habitat flag source)
Ceratium tripos (O.F. Müller) Nitzsch, 1817 (habitat flag source)
Ceratostomataceae (habitat flag source)
Chaetoceros muelleri Lemmermann, 1898 (habitat flag source)
Chaetomorpha linum (O.F. Müller) Kützing, 1845 (habitat flag source)
Chromadoridae Filipjev, 1917 (habitat flag source)
Chroococcus cohaerens (Brébisson) Nägeli, 1849 (habitat flag source)
Chroococcus dispersus (Keissler) Lemmermann, 1904 (habitat flag source)
Chroococcus distans (G.M. Smith) Komárková-Legnerová & Cronberg, 1993 (habitat flag source)
Chroococcus minimus (Keissler) Lemmermann, 1904 (habitat flag source)
Chroococcus minor (Kützing) Nägeli, 1849 (habitat flag source)
Chroococcus minutus (Kützing) Nägeli, 1849 (habitat flag source)
Chroococcus turgidus (Kützing) Nägeli, 1849 accepted as Chroococcus dimidiatus (Kützing) Nägeli, 1849 (habitat flag source)
Chroodactylon ornatum (C. Agardh) Basson, 1979 (habitat flag source)
Chytridiomycota incertae sedis (habitat flag source)
Cladophora flexuosa (O.F. Müller) Kützing, 1843 (habitat flag source)
Cladophora fracta (O.F. Müller ex Vahl) Kützing, 1843 (habitat flag source)
Cladophora glomerata (Linnaeus) Kützing, 1843 (habitat flag source)
Cocconeis diminuta Pantocsek, 1902 accepted as Cocconeis neodiminuta Krammer, 1990 (habitat flag source)
Cocconeis pediculus Kützing (habitat flag source)
Cocconeis placentula Ehrenberg, 1838 (habitat flag source)