Acanthoceras H. Honigmann, 1909 (habitat flag source)
Acanthoceras madeburgensis Hongimann, 1910 (habitat flag source)
Acanthococcus J.D. Hooker & W.H. Harvey, 1845 (habitat flag source)
Acanthococcus aciculiferus Lagerheim, 1883 accepted as Trochiscia aciculifera (Lagerheim) Hansgirg, 1888 (habitat flag source)
Achnanthes aperta J.R. Carter, 1981 accepted as Achnanthes oestrupii (A. Cleve-Euler) Hustedt, 1930 (habitat flag source)
Achnanthes austriaca Hustedt, 1922 (habitat flag source)
Achnanthes bicapitata Hustedt, 1952 (habitat flag source)
Achnanthes borealis A. Cleve, 1895 (habitat flag source)
Achnanthes boyei Østrup, 1918 accepted as Achnanthes lanceolata (Brébisson ex Kützing) Grunow, 1880 (habitat flag source)
Achnanthes curtissima J.R. Carter, 1963 (habitat flag source)
Achnanthes depressa (Cleve) Hustedt, 1933 (habitat flag source)
Achnanthes distincta Messikommer, 1954 accepted as Achnantheiopsis distincta (Messikommer) H. Lange-Bertalot, 1997 (habitat flag source)
Achnanthes divergens A. Cleve, 1953 (habitat flag source)
Achnanthes expressa J.R. Carter, 1981 (habitat flag source)
Achnanthes fluviatilis A. Cleve, 1953 (habitat flag source)
Achnanthes fontana Round, 1959 (habitat flag source)
Achnanthes fugei J.R. Carter, 1963 (habitat flag source)
Achnanthes gracillima Hustedt, 1927 (habitat flag source)
Achnanthes hallandica A. Cleve, 1953 (habitat flag source)
Achnanthes haynaldii Schaarschmidt, 1881 accepted as Achnanthes lanceolata (Brébisson ex Kützing) Grunow, 1880 (habitat flag source)
Achnanthes hintzii H. Lange-Bertalot & Krammer, 1989 (habitat flag source)
Achnanthes inflata (Kützing) Grunow, 1867 (habitat flag source)
Achnanthes kriegeri Krasske, 1943 (habitat flag source)
Achnanthes kryophila J.B. Petersen, 1924 (habitat flag source)
Achnanthes lapidosa Krasske, 1929 (habitat flag source)
Achnanthes lintonensis J.R. Carter, 1961 (habitat flag source)
Achnanthes lutheri Hustedt, 1933 (habitat flag source)
Achnanthes maxima A. Cleve, 1953 (habitat flag source)
Achnanthes minima J.R. Carter, 1961 (habitat flag source)
Achnanthes montana Krasske, 1929 (habitat flag source)
Achnanthes nodosa Cleve, 1900 (habitat flag source)
Achnanthes perfida J.R. Carter, 1963 (habitat flag source)
Achnanthes pinnata Hustedt, 1922 accepted as Achnanthes conspicua A. Mayer, 1919 (habitat flag source)
Achnanthes plana J.R. Carter, 1963 accepted as Achnanthes lanceolata (Brébisson ex Kützing) Grunow, 1880 (habitat flag source)
Achnanthes ploenensis Hustedt, 1930 (habitat flag source)
Achnanthes pseudosuchlandtii Manguin, 1961 (habitat flag source)
Achnanthes pseudotanensis A. Cleve-Euler, 1953 accepted as Achnanthes lanceolata (Brébisson ex Kützing) Grunow, 1880 (habitat flag source)
Achnanthes punctata Round, 1959 (habitat flag source)
Achnanthes quadratarea (Østrup) M. Möller ex Foged, 1974 accepted as Eucocconeis quadratarea (Østrup) H. Lange-Bertalot, 1999 (habitat flag source)
Achnanthes rechtensis Leclercq, 1983 (habitat flag source)
Achnanthes rostellata A. Cleve, 1934 (habitat flag source)
Achnanthes rupestoides Hohn, 1961 (habitat flag source)
Achnanthes rupestris Krasske, 1932 (habitat flag source)
Achnanthes saccula J.R. Carter, 1981 (habitat flag source)
Achnanthes semiaperta Hustedt, 1945 (habitat flag source)
Achnanthes sonyda B. Hartley, 1986 accepted as Achnanthes petersenii Hustedt, 1937 (habitat flag source)
Achnanthes stroemii Hustedt, 1933 accepted as Achnanthes fimbriata (Grunow) R. Ross, 1963 (habitat flag source)
Achnanthes suspecta A. Cleve, 1934 (habitat flag source)
Achnanthes tenuis Hustedt, 1955 accepted as Astartiella tenuis (Hustedt) Witkowski & H. Lange-Bertalot, 1998 (habitat flag source)
Achnanthes trinodis (W. Smith) Grunow, 1880 (habitat flag source)
Achnanthes umara J.R. Carter, 1970 accepted as Achnanthes subatomoides (Hustedt) H. Lange-Bertalot & Archibald, 1985 (habitat flag source)
Achnanthidium kranzii (H. Lange-Bertalot) F.E. Round & L. Bukhtiyarova, 1996 (habitat flag source)
Achnanthidium kryophila (J.B. Petersen) Bukhtiyarova, 1995 accepted as Achnanthes childanos Hohn & Hellerman, 1963 (habitat flag source)
Achnanthidium macrocephalum (Hustedt) F.E. Round & L. Bukhtiyarova, 1996 (habitat flag source)
Achnanthidium saprophila (H. Kobayashi & Mayama) F.E. Round & L. Bukhtiyarova, 1996 (habitat flag source)
Actinochloris sphaerica Korschikov, 1953 (habitat flag source)
Actinochloris terrestris (Vischer) H. Ettl & G. Gärtner, 1987 (habitat flag source)
Actinotaenium adelochondrum (Elfving) Teiling, 1954 (habitat flag source)
Actinotaenium capax (Joshua) Teiling, 1954 (habitat flag source)
Actinotaenium clevei (P. Lundell) Teiling, 1954 (habitat flag source)
Actinotaenium colpopelta (Brébisson ex W. Archer) Compère, 1976 (habitat flag source)
Actinotaenium crassiusculum (De Bary) Teiling, 1954 (habitat flag source)
Actinotaenium cruciferum (De Bary) Teiling, 1954 (habitat flag source)
Actinotaenium cucurbita (Brébisson ex Ralfs) Teiling, 1954 (habitat flag source)
Actinotaenium cucurbitinum (Bisset) Teiling, 1954 (habitat flag source)
Actinotaenium diplosporum (P. Lundell) Teiling, 1954 (habitat flag source)
Actinotaenium gelidum (Wittrock ex De Toni) Ruzicka, 1978 (habitat flag source)
Actinotaenium habeebense (Irénée-Marie) A.J. Brook & D.B. Williamson, 1990 (habitat flag source)
Actinotaenium inconspicuum (W. West & G.S. West) Teiling, 1954 (habitat flag source)
Actinotaenium lagenarioides (Roy) Teiling, 1954 (habitat flag source)
Actinotaenium minutissimum (Nordstedt) Teiling, 1954 (habitat flag source)
Actinotaenium mooreanum (W. Archer) Teiling, 1954 (habitat flag source)
Actinotaenium obcuneatum (W. West) Teiling, 1954 (habitat flag source)
Actinotaenium perminutum (G.S. West) Teiling, 1954 (habitat flag source)
Actinotaenium rufescens (Cleve) Teiling, 1954 (habitat flag source)
Actinotaenium silvae-nigrae (Rabanus) Kouwets & Coesel, 1984 (habitat flag source)
Actinotaenium spinospermum (Joshua) Kouwets & Coesel, 1984 (habitat flag source)
Actinotaenium subglobosum (Nordstedt) Teiling, 1954 (habitat flag source)
Actinotaenium subpalangula (Elfving) Teiling, 1954 (habitat flag source)
Actinotaenium subtile (W. West & G.S. West) Teiling, 1954 (habitat flag source)
Actinotaenium truncatum (Brébisson ex Ralfs) Teiling ex Ruzicka & Pouzar, 1978 (habitat flag source)
Actinotaenium turgidum (Brébisson ex Ralfs) Teiling, 1954 (habitat flag source)
Actinotaenium wollei (W. West & G.S. West) Teiling, 1954 (habitat flag source)
Ammatoidea W. West & G.S. West, 1897 (habitat flag source)
Amphichrysis Korshikov, 1929 (habitat flag source)
Amphichrysis compressa Korshikov, 1929 (habitat flag source)
Amphidinium Claparède & Lachmann, 1859 (habitat flag source)
Amphidinium aeschrum T.M. Harris, 1941 (habitat flag source)
Amphidinium amphidinioides (Geitler) Schiller, 1932 (habitat flag source)
Amphidinium elenkinii Skvortzov, 1925 (habitat flag source)
Amphikrikos minutissimus Korshikov, 1953 (habitat flag source)
Amphikrikos nanus (Fott & Heynig) Hindák, 1977 (habitat flag source)
Amphilothus Kofoid ex Poche, 1913 accepted as Monaster Schütt, 1895 (habitat flag source)
Amphipleura kriegeriana (Krasske) Hustedt, 1954 (habitat flag source)
Amphipleura lindheimeri Grunow, 1862 (habitat flag source)
Amphiprora oestrupii Van Heurck, 1909 accepted as Entomoneis oestrupii (Van Heurck) Cremer, 2003 (habitat flag source)
Amphithrix Bornet & Flahault, 1886 accepted as Homoeothrix (G. Thuret ex E. Bornet & C. Flahault) O. Kirchner in A. Engler & Prantl, 1898 (habitat flag source)
Amphithrix janthina Bornet & Flahault (habitat flag source)
Amphithrix violacea Bornet & Flahault, 1886 (habitat flag source)
Amphora aequalis Krammer, 1980 (habitat flag source)