Achnanthepyla Perag., 1921 (basis of record)
Achnanthepyla gainii accepted as Achnanthepyla gainii var. gainii Perag., 1921 accepted as Achnanthes gainii (M. Peragallo) Mann, 1937 (basis of record)
Achnanthepyla gainii var. gainii Perag., 1921 accepted as Achnanthes gainii (M. Peragallo) Mann, 1937 (basis of record)
Achnanthes Bory, 1822 (additional source)
Achnanthes abundans Manguin in Bourrelly & Manguin, 1954 accepted as Psammothidium abundans (Manguin, Bourrelly & Manguin) L.Bukhtiyarova, 1996 (additional source)
Achnanthes abundans var. abundans Manguin in Bourrelly & Manguin, 1955 accepted as Achnanthes abundans Manguin in Bourrelly & Manguin, 1954 accepted as Psammothidium abundans (Manguin, Bourrelly & Manguin) L.Bukhtiyarova, 1996 (basis of record)
Achnanthes austriaca Hust., 1922 accepted as Eucocconeis austriaca (Hustedt) H. Lange-Bertalot apud H. Lange-Bertalot & S.I. Genkal in H. Lange-Bertalot (ed.), 1999 accepted as Achnanthes austriaca var. austriaca Hust., 1922 (additional source)
Achnanthes austriaca var. austriaca Hust., 1922 accepted as Achnanthes austriaca Hust., 1922 accepted as Eucocconeis austriaca (Hustedt) H. Lange-Bertalot apud H. Lange-Bertalot & S.I. Genkal in H. Lange-Bertalot (ed.), 1999 (additional source)
Achnanthes brevipes C.Agardh, 1824 (additional source)
Achnanthes brevipes Kützing, 1833 (basis of record)
Achnanthes brevipes var. arctica (P. T. Cleve) T. Ko-Bayashi, 1965 accepted as Achnanthidium arcticum Cleve, 1873 (basis of record)
Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895 accepted as Achnanthes intermedia Kützing, 1833 (additional source)
Achnanthes chlidanos M.H.Hohn & Hellerman, 1963 (basis of record)
Achnanthes clevei Grunow, 1880 accepted as Karayevia clevei (Grunow) Round & Bukhtiyarova, 1999 (additional source)
Achnanthes coarctata (Brébisson ex W.Smith) Grunow, 1880 (additional source)
Achnanthes coarctata var. elliptica Krasske, 1929 (additional source)
Achnanthes conspicua var. conspicua A.Mayer, 1919 (additional source)
Achnanthes delicatula (Kützing) Brun, 1880 accepted as Achnanthidium delicatulum f. delicatulum Kützing, 1844 (additional source)
Achnanthes engelbrechtii var. engelbrechtii Cholnoky, 1955 (basis of record)
Achnanthes exilis Kützing, 1833 accepted as Achnanthidium exile (Kützing) Heiberg, 1863 accepted as Achnanthes exilis var. exilis Kützing, 1833 (additional source)
Achnanthes exilis sensu W. Smith, 1856 (basis of record)
Achnanthes exilis var. exilis Kützing, 1833 (basis of record)
Achnanthes exilis var. minutissima Brun, 1880 (basis of record)
Achnanthes gainii (M. Peragallo) Mann, 1937 (basis of record)
Achnanthes germainii Manguin in Bourrelly & Manguin, 1954 (basis of record)
Achnanthes groenlandica (Cleve) Grunow, 1880 (additional source)
Achnanthes hauckiana Grunow, 1880 (additional source)
Achnanthes hauckiana var. hauckiana Grunow in Cleve & Grunow, 1880 (basis of record)
Achnanthes hungarica (Grunow) Grunow, 1880 accepted as Lemnicola hungarica (Grunow) F.E.Round & P.W.Basson, 1997 accepted as Achnanthidium hungaricum Grunow, 1863 (additional source)
Achnanthes inflata (Kützing) Grunow, 1867 (additional source)
Achnanthes intermedia Kützing, 1833 (additional source)
Achnanthes kryophila J.B.Petersen, 1924 accepted as Achnanthes chlidanos M.H.Hohn & Hellerman, 1963 (additional source)
Achnanthes lanceolata (Brébisson ex Kützing) Grunow, 1880 accepted as Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999 (additional source)
Achnanthes lanceolata (Patrick) Lange-Bertalot, 1993 accepted as Achnanthes lanceolata var. apiculata R.M.Patrick, 1945 accepted as Planothidium apiculatum (Patrick) R.Lowe in Johansen et al., 2004 accepted as Planothidium apiculatum (R.M.Patrick) Lange-Bertalot, 1999 (basis of record)
Achnanthes lanceolata var. apiculata R.M.Patrick, 1945 accepted as Planothidium apiculatum (Patrick) R.Lowe in Johansen et al., 2004 accepted as Planothidium apiculatum (R.M.Patrick) Lange-Bertalot, 1999 (basis of record)
Achnanthes lapidosa Krasske, 1929 accepted as Nupela lapidosa (Krasske) Lange-Bertalot, 1999 (additional source)
Achnanthes lapidosa var. lapidosa Krasske, 1929 accepted as Nupela lapidosa (Krasske) Lange-Bertalot, 1999 (basis of record)
Achnanthes lapponica (Hustedt) Hustedt, 1933 accepted as Eucocconeis quadratarea (Østrup) Lange-Bertalot, 1999 (additional source)
Achnanthes linearis (W.Smith) Grunow, 1880 accepted as Achnanthidium lineare W.Smith, 1855 (additional source)
Achnanthes manguinii Hustedt (additional source)
Achnanthes marginulata Grunow, 1880 (additional source)
Achnanthes marginulata var. marginulata Grunow in Cleve & Grunow, 1880 (basis of record)
Achnanthes metakryophila Lange-Bertalot & Schmidt, 1990 (basis of record)
Achnanthes minutissima Kützing, 1833 (additional source)
Achnanthes minutissima var. cryptocephala Grunow, 1880 (additional source)
Achnanthes minutissima var. minutissima Kützing, 1833 (basis of record)
Achnanthes modesta Manguin in Bourrelly & Manguin, 1954 accepted as Achnanthidium modestiforme (Lange-Bert.) Van de Vijver in Van de Vijver et al., 2002 (additional source)
Achnanthes montana Krasske, 1929 accepted as Psammothidium montanum (Krasske) Mayuma, 2002 accepted as Achnanthes montana var. montana Krasske, 1929 (additional source)
Achnanthes montana var. montana Krasske, 1929 (basis of record)
Achnanthes ninckei P.Guermeur & E.Manguin, 1953 (basis of record)
Achnanthes nodosa Cleve, 1900 (additional source)
Achnanthes oblongella Østrup, 1902 (additional source)
Achnanthes parvula Kützing, 1844 (additional source)
Achnanthes parvula Kützing, 1836 (basis of record)
Achnanthes pseudolanceolata Manguin, 1962 (basis of record)
Achnanthes saxonica Krasske ex Hustedt, 1933 (additional source)
Achnanthes stauroneioides Manguin in Bourrelly & Manguin, 1954 (basis of record)
Achnanthes subatomoides (Hustedt) Lange-Bertalot & Archibald, 1985 accepted as Navicula subatomoides Hustedt, 1936 (basis of record)
Achnanthes subsessilis Kützing, 1833 accepted as Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895 accepted as Achnanthes intermedia Kützing, 1833 (additional source)
Achnanthes taylorensis D.E. Kellogg, M. Stuiver, T.B. Kellogg & G.H. DEnton, 1980 (basis of record)
Achnanthes vicentii Manguin, 1957 (additional source)
Achnanthidium F.T. Kützing, 1844 (additional source)
Achnanthidium arcticum Cleve, 1873 (additional source)
Achnanthidium delicatulum sensu Schumann, 1867 (basis of record)
Achnanthidium delicatulum f. delicatulum Kützing, 1844 (basis of record)
Achnanthidium exile (Kützing) Heiberg, 1863 accepted as Achnanthes exilis var. exilis Kützing, 1833 (basis of record)
Achnanthidium hungaricum Grunow, 1863 (additional source)
Achnanthidium lanceolatum Brébisson ex Kützing, 1846 accepted as Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999 (additional source)
Achnanthidium lanceolatum f. lanceolatum Brébisson ex Kützing, 1846 (basis of record)
Achnanthidium lanceolatum f. typica Meister, 1912 (basis of record)
Achnanthidium lapidosum (Krasske) Kobayasi, 2002 accepted as Nupela lapidosa (Krasske) Lange-Bertalot, 1999 (basis of record)
Achnanthidium lineare W.Smith, 1855 (additional source)
Achnanthidium microcephalum Kützing, 1844 (additional source)
Achnanthidium microcephalum sensu Neupauer, 1867 (basis of record)
Achnanthidium minutissimum (Kützing) Czarnecki, 1994 accepted as Achnanthes minutissima var. minutissima Kützing, 1833 (additional source)
Achnanthidium modestiforme (Lange-Bert.) Van de Vijver in Van de Vijver et al., 2002 (basis of record)
Achnanthidium subatomoides (Hustedt) O. Monnier, H. Lange-Bertalot & L. Ector in Monnier et al., 2007 accepted as Navicula subatomoides Hustedt, 1936 (additional source)
Actinocyclus C.G. Ehrenberg, 1837 (additional source)
Actinocyclus actinochilus (Ehrenberg) Simonsen, 1982 accepted as Coscinodiscus actinochilus Ehrenberg, 1844 (additional source)
Actinocyclus adeliae Manguin, 1957 (additional source)
Actinocyclus cholnokyi VanLandingham, 1967 (additional source)
Actinocyclus complanatus var. complanatus Castracane, 1886 (basis of record)
Actinocyclus curvatulus Janisch, 1874 (basis of record)
Actinocyclus dimorphus (Castracane) Harwood & Maruyama, 1992 accepted as Coscinodiscus dimorphus Castracane, 1886 (additional source)
Actinocyclus divisus (Grunow) Hustedt, 1958 accepted as Coscinodiscus divisus var. divisus Grunow, 1878 (additional source)
Actinocyclus ehrenbergii Schumann, 1867 (basis of record)
Actinocyclus ehrenbergii Ralfs, 1861 (additional source)
Actinocyclus ehrenbergii var. asteriscus Barron, 1975 † represented as Actinocyclus asteriscus (J.A. Barron) Cong Wu, D.M. Williams, Zhiyuan Peng & Chixin Chen, 2022 † (basis of record)
Actinocyclus exiguus G.Fryxell & Semina, 1981 (additional source)
Actinocyclus ingens Rattray, 1890 † (additional source)
Actinocyclus ingens var. ovalis R.Gersonde, 1990 (basis of record)
Actinocyclus karstenii Van Heurck, 1909 (basis of record)
Actinocyclus octonarius Ehrenberg, 1837 accepted as Actinoptychus octonarius (Ehrenberg) Kützing, 1844 accepted as Actinocyclus octonarius var. octonarius Ehrenberg, 1837 (additional source)
Actinocyclus octonarius var. octonarius Ehrenberg, 1837 (additional source)
Actinocyclus senarius Ehrenberg, 1838 (additional source)
Actinocyclus spiritus T.P.Watkins, 1986 (additional source)
Actinocyclus undulatus J.W.Bailey, 1842 (additional source)
Actinoptychus C.G. Ehrenberg, 1843 (basis of record)
Actinoptychus octonarius (Ehrenberg) Kützing, 1844 accepted as Actinocyclus octonarius var. octonarius Ehrenberg, 1837 (additional source)
Actinoptychus senarius (Ehrenberg) Ehrenberg, 1843 accepted as Actinocyclus senarius Ehrenberg, 1838 (additional source)