Between brackets is the number of accepted extant species
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- Biota (12 687)
- Kingdom Animalia (9 793)
- Kingdom Archaea (1)
- Kingdom Bacteria (310)
- Kingdom Chromista (956)
- Subkingdom Chromobiota
- Subkingdom Cryptista accepted as Cryptophyta
- Subkingdom Hacrobia (58)
- Subkingdom Harosa (627)
- Phylum Bacillariophyta
- Phylum Heterokontophyta (271)
- Subphylum Bacillariophytina (271)
- Class Bacillariophyceae (271)
- Subclass Bacillariophyceae incertae sedis (2)
- Subclass Bacillariophycidae (168)
- Superorder Bacillariophycanae (167)
- Order Achnanthales (18)
- Family Achnanthaceae Kützing, 1844 (8)
- Genus Achnanthes Bory, 1822 (8)
- Species Achnanthes abundans Manguin in Bourrelly & Manguin, 1954 accepted as Psammothidium abundans (Manguin, Bourrelly & Manguin) L.Bukhtiyarova, 1996
- Species 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
- Species Achnanthes brevipes C.Agardh, 1824
- Variety Achnanthes brevipes var. arctica (P. T. Cleve) T. Ko-Bayashi, 1965 accepted as Achnanthidium arcticum Cleve, 1873
- Variety Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895 accepted as Achnanthes intermedia Kützing, 1833
- Species Achnanthes brevipes Kützing, 1833
- Species Achnanthes chlidanos M.H.Hohn & Hellerman, 1963
- Species Achnanthes clevei Grunow, 1880 accepted as Karayevia clevei (Grunow) Round & Bukhtiyarova, 1999
- Species Achnanthes coarctata (Brébisson ex W.Smith) Grunow, 1880
- Species Achnanthes confusa Manguin
- Species Achnanthes conspicua A.Mayer, 1919 accepted as Planothidium conspicuum (A.Mayer) M.Aboal, 2003
- Species Achnanthes delicatula (Kützing) Brun, 1880 accepted as Achnanthidium delicatulum f. delicatulum Kützing, 1844
- Species Achnanthes engelbrechtii Cholnoky, 1955 accepted as Planothidium engelbrechtii (Cholnoky) Round & L.Bukhtiyarova, 1996
- Species Achnanthes exilis Kützing, 1833 accepted as Achnanthidium exile (Kützing) Heiberg, 1863
- Species Achnanthes exilis sensu W. Smith, 1856
- Species Achnanthes gainii (M. Peragallo) Mann, 1937
- Species Achnanthes germainii Manguin in Bourrelly & Manguin, 1954
- Species Achnanthes groenlandica (Cleve) Grunow, 1880
- Species Achnanthes hauckiana Grunow, 1880
- Species Achnanthes hungarica (Grunow) Grunow, 1880 accepted as Lemnicola hungarica (Grunow) F.E.Round & P.W.Basson, 1997
- Species Achnanthes inflata (Kützing) Grunow, 1867
- Species Achnanthes intermedia Kützing, 1833
- Species Achnanthes kryophila J.B.Petersen, 1924 accepted as Achnanthes chlidanos M.H.Hohn & Hellerman, 1963
- Species Achnanthes lanceolata (Brébisson ex Kützing) Grunow, 1880 accepted as Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999
- Species Achnanthes lanceolata (Patrick) Lange-Bertalot, 1993 accepted as Achnanthes lanceolata var. apiculata R.M.Patrick, 1945
- Species Achnanthes lapidosa Krasske, 1929 accepted as Nupela lapidosa (Krasske) Lange-Bertalot, 1999
- Species Achnanthes lapponica (Hustedt) Hustedt, 1933 accepted as Eucocconeis quadratarea (Østrup) Lange-Bertalot, 1999
- Species Achnanthes linearis (W.Smith) Grunow, 1880 accepted as Achnanthidium lineare W.Smith, 1855
- Species Achnanthes manguinii Hustedt
- Species Achnanthes marginulata Grunow, 1880
- Species Achnanthes metakryophila Lange-Bertalot & Schmidt, 1990
- Species Achnanthes minutissima Kützing, 1833
- Species Achnanthes modesta Manguin in Bourrelly & Manguin, 1954 accepted as Achnanthidium modestiforme (Lange-Bert.) Van de Vijver in Van de Vijver et al., 2002
- Species Achnanthes montana Krasske, 1929 accepted as Psammothidium montanum (Krasske) Mayuma, 2002
- Species Achnanthes ninckei P.Guermeur & E.Manguin, 1953
- Species Achnanthes nodosa Cleve, 1900
- Species Achnanthes oblongella Østrup, 1902
- Species Achnanthes parvula Kützing, 1844
- Species Achnanthes parvula Kützing, 1836
- Species Achnanthes petersenii Hustedt, 1937
- Species Achnanthes pseudolanceolata Manguin, 1962
- Species Achnanthes saxonica Krasske ex Hustedt, 1933
- Species Achnanthes stauroneioides Manguin in Bourrelly & Manguin, 1954
- Species Achnanthes subatomoides (Hustedt) Lange-Bertalot & Archibald, 1985 accepted as Navicula subatomoides Hustedt, 1936
- Species Achnanthes subsessilis Kützing, 1833 accepted as Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895
- Species Achnanthes taylorensis D.E. Kellogg, M. Stuiver, T.B. Kellogg & G.H. DEnton, 1980
- Species Achnanthes vicentii Manguin, 1957
- Family Achnanthidiaceae D.G. Mann, 1990 (6)
- Family Cocconeidaceae Kützing, 1844 (4)
- Order Bacillariales (35)
- Order Cymbellales (14)
- Order Lyrellales
- Order Mastogloiales (1)
- Order Naviculales (84)
- Order Rhopalodiales (4)
- Order Surirellales (3)
- Order Thalassiophysales (8)
- Superorder Bacillariophycidae incertae sedis
- Superorder Eunotiophycanae (1)
- Subclass Coscinodiscophycidae (67)
- Subclass Fragilariophycidae (34)
- Phylum Xanthophyta accepted as Xanthophyceae
- Kingdom Fungi (740)
- Kingdom Plantae (822)
- Kingdom Protozoa (65)
