Achnanthes Bory, 1822 (additional source)
Achnanthes affinis Grunow, 1880 accepted as Achnanthidium affine (Grunow) Czarnecki, 1994 accepted as Achnanthes affinis var. affinis Grunow in Cleve & Grunow, 1880 (additional source)
Achnanthes angustata Grev., 1859 (additional source)
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 (basis of record)
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 (basis of record)
Achnanthes biasolettiana Grunow, 1880 accepted as Achnanthidium pyrenaicum (Hustedt) H.Kobayasi, 1997 accepted as Achnanthes pyrenaica var. pyrenaica Hustedt, 1939 (additional source)
Achnanthes brevipes C.Agardh, 1824 (additional source)
Achnanthes brevipes var. brevipes Agardh, 1824 (additional source)
Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895 accepted as Achnanthes intermedia Kützing, 1833 (additional source)
Achnanthes brevipes var. parvula (Kützing) Cleve, 1895 accepted as Achnanthes parvula Kützing, 1844 (additional source)
Achnanthes clevei Grunow, 1880 accepted as Karayevia clevei (Grunow) Round & Bukhtiyarova, 1999 (basis of record)
Achnanthes clevei var. bottnica Cleve, 1891 (additional source)
Achnanthes clevei var. rostrata Hustedt, 1930 (basis of record)
Achnanthes coarctata (Brébisson ex W.Smith) Grunow, 1880 (basis of record)
Achnanthes coarctata var. sinaensis Hustedt, 1949 (basis of record)
Achnanthes conspicua A.Mayer, 1919 accepted as Planothidium conspicuum (A.Mayer) M.Aboal, 2003 accepted as Achnanthes conspicua var. conspicua A.Mayer, 1919 (basis of record)
Achnanthes conspicua var. conspicua A.Mayer, 1919 (basis of record)
Achnanthes delicatula (Kützing) Grunow in Cleve & Grunow, 1880 accepted as Planothidium delicatulum (Kützing) Round & Bukhtiyarova, 1996 accepted as Achnanthidium delicatulum f. delicatulum Kützing, 1844 (additional source)
Achnanthes delicatula subsp. hauckiana (Grunow) Lange-Bertalot & Ruppel, 1980 accepted as Planothidium hauckianum (Grunow) Round & Bukhtiyarova, 1996 (basis of record)
Achnanthes dispar Cleve, 1891 accepted as Planothidium dispar (Cleve) Witkowski, Lange-Bertalot & Metzeltin, 2000 accepted as Achnanthes dispar var. dispar Cleve, 1891 (additional source)
Achnanthes exigua Grunow, 1880 (additional source)
Achnanthes exigua var. constricta (Grunow) Hustedt, 1921 accepted as Achnanthes exigua Grunow, 1880 (additional source)
Achnanthes exigua var. heterovalva Krasske, 1923 accepted as Achnanthidium exiguum var. heterovalvum (G.Krasske) D.B.Czarnecki, 1994 accepted as Achnanthes exigua f. heterovalvata Krasske, 1923 (additional source)
Achnanthes fimbriata (Grunow) R.Ross, 1963 accepted as Schizostauron fimbriatum Grunow, 1867 (basis of record)
Achnanthes flexella (Kützing) Brun, 1880 accepted as Eucocconeis flexella (Kützing) Meister, 1912 accepted as Cymbella flexella Kützing, 1844 (additional source)
Achnanthes gibberula Grunow, 1880 accepted as Crenotia gibberula (Grunow) Wojtal (additional source)
Achnanthes groenlandica (Cleve) Grunow, 1880 (basis of record)
Achnanthes hauckiana Grunow, 1880 (source of synonymy)
Achnanthes hauckiana var. rostrata Schulz, 1926 (additional source)
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 intermedia Kützing, 1833 (additional source)
Achnanthes laevis Østrup, 1910 (additional source)
Achnanthes lanceolata (Brébisson ex Kützing) Grunow, 1880 accepted as Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999 (additional source)
Achnanthes lanceolata var. dubia Grunow, 1880 (basis of record)
Achnanthes lanceolata var. elliptica Cleve, 1891 (additional source)
Achnanthes lanceolata var. rostrata Hustedt, 1911 accepted as Planothidium rostratoholarcticum Lange-Bertalot & Bak in Bak & Lange-Bertalot, 2014 (additional source)
Achnanthes lapponica (Hustedt) Hustedt, 1933 accepted as Eucocconeis quadratarea (Østrup) Lange-Bertalot, 1999 (basis of record)
Achnanthes latissima Cleve-Euler, 1915 (basis of record)
Achnanthes lemmermannii Hustedt, 1933 (basis of record)
Achnanthes lemmermannii subsp. lineata Salah, 1953 (basis of record)
Achnanthes lemmermannii var. lemmermannii Hustedt, 1933 (basis of record)
Achnanthes lemmermannii var. obtusa Hustedt, 1939 (basis of record)
Achnanthes levanderi Hustedt, 1933 accepted as Psammothidium levanderi (Hustedt) L.Bukhtiyarova & Round, 1996 accepted as Achnanthes levanderi var. levanderi Hustedt, 1933 (additional source)
Achnanthes lilljeborgei Grunow, 1881 accepted as Planothidium lilljeborgei (Grunow) Witkowski accepted as Achnanthes lilljeborgii Grunow, 1881 (basis of record)
Achnanthes linearis (W.Smith) Grunow, 1880 accepted as Achnanthidium lineare W.Smith, 1855 (additional source)
Achnanthes linkei Hustedt, 1939 accepted as Planothidium linkei (Hustedt) Lange-Bertalot, 1999 accepted as Achnanthes linkei var. linkei Hustedt, 1939 (basis of record)
Achnanthes longipes C.Agardh, 1824 (additional source)
Achnanthes microcephala (Kützing) Grunow, 1880 accepted as Achnanthidium microcephalum Kützing, 1844 (additional source)
Achnanthes minuscula Hustedt, 1945 (additional source)
Achnanthes minutissima Kützing, 1833 (additional source)
Achnanthes minutissima var. cryptocephala Grunow, 1880 (additional source)
Achnanthes minutissima var. minutissima Krasske, 1938 (basis of record)
Achnanthes obliqua (Gregory) Hustedt, 1924 accepted as Gololobovia obliqua (W.Gregory) Kulikovskiy, Glushchenko & Kociolek in Kulikovskiy et al., 2020 (basis of record)
Achnanthes oestrupii (Cleve-Euler) Hustedt, 1930 (basis of record)
Achnanthes peragalli Brun & Héribaud-Joseph, 1893 accepted as Skabitschewskia peragalli (Brun & Heribaud) Kulikovskiy & Lange-Bertalot, 2015 (additional source)
Achnanthes petersenii Hustedt, 1937 (source of synonymy)
Achnanthes pseudobrevipes Aleem, 1950 (basis of record)
Achnanthes pusilla Grunow in Cleve & Grunow, 1880 (additional source)
Achnanthes pusilla var. petersenii (Hustedt) Lange-Bertalot, 1980 accepted as Achnanthes petersenii var. petersenii Hustedt, 1936 (basis of record)
Achnanthes pyrenaica Hustedt, 1939 accepted as Achnanthidium pyrenaicum (Hustedt) H.Kobayasi, 1997 accepted as Achnanthes pyrenaica var. pyrenaica Hustedt, 1939 (basis of record)
Achnanthes rostrata Oestrup, 1902 (additional source)
Achnanthes saxonica Krasske ex Hustedt, 1933 (basis of record)
Achnanthes similis McCall, 1933 (basis of record)
Achnanthes subsalsa J.B.Petersen, 1928 (additional source)
Achnanthes subsalsoides Hustedt, 1933 (additional source)
Achnanthes subsessilis Kützing, 1833 accepted as Achnanthes brevipes var. intermedia (Kützing) Cleve, 1895 accepted as Achnanthes intermedia Kützing, 1833 (additional source)
Achnanthes suchlandtii Hustedt, 1933 accepted as Karayevia suchlandtii (Hustedt) Buktiyarova, 1999 accepted as Achnanthes suchlandtii var. suchlandtii Hustedt, 1933 (additional source)
Achnanthes taeniata Grunow, 1880 accepted as Pauliella taeniata (Grunow) F.E.Round & P.W.Basson, 1997 (additional source)
Achnanthidium coarctatum Brébisson ex W.Smith, 1855 accepted as Achnanthes coarctata (Brébisson ex W.Smith) Grunow, 1880 (basis of record)
Achnanthidium hungaricum Grunow, 1863 (basis of record)
Achnanthidium lanceolatum Brébisson ex Kützing, 1846 accepted as Planothidium lanceolatum (Brébisson ex Kützing) Bukhtiyarova, 1999 (additional source)
Achnanthidium lineare W.Smith, 1855 (additional source)
Achnanthidium microcephalum Kützing, 1844 (additional source)
Actinocyclus C.G. Ehrenberg, 1837 (additional source)
Actinocyclus crassus (W.Smith) Ralfs ex Pritchard, 1861 accepted as Eupodiscus crassus W.Smith, 1853 (additional source)
Actinocyclus ehrenbergii Ralfs, 1861 (additional source)
Actinocyclus ehrenbergii var. crassa (W. Smith) Hustedt, 1929 accepted as Eupodiscus crassus W.Smith, 1853 (additional source)
Actinocyclus ehrenbergii var. ralfsii (W.Smith) Hustedt, 1929 accepted as Eupodiscus ralfsii var. ralfsii W. Smith, 1856 (additional source)
Actinocyclus ehrenbergii var. sparsa (Gregory) Hustedt, 1929 accepted as Eupodiscus sparsus Gregory, 1857 (additional source)
Actinocyclus ehrenbergii var. tenella (Brébisson) Hustedt, 1929 accepted as Eupodiscus tenellus Brébisson, 1854 (additional source)
Actinocyclus fulvus (W.Smith) Ralfs ex Pritchard, 1861 accepted as Eupodiscus fulvus W. Smith, 1853 (basis of record)
Actinocyclus normanii (Gregory) Hustedt, 1957 (additional source)
Actinocyclus normanii f. normanii (W. Gregory) Hustedt, 1957 accepted as Coscinodiscus normanii Gregory ex Greville, 1859 (additional source)
Actinocyclus normanii f. subsalsus (Juhlin-Dannfelt) Hustedt (additional source)
Actinocyclus octonarius Ehrenberg, 1837 accepted as Actinoptychus octonarius (Ehrenberg) Kützing, 1844 accepted as Actinocyclus octonarius var. octonarius Ehrenberg, 1837 (basis of record)
Actinocyclus octonarius var. crassus (W.Smith) Hendey, 1954 accepted as Eupodiscus crassus W.Smith, 1853 (basis of record)
Actinocyclus octonarius var. octonarius Ehrenberg, 1837 (additional source)
Actinocyclus octonarius var. ralfsii (W.Smith) Hendey, 1954 accepted as Eupodiscus ralfsii var. ralfsii W. Smith, 1856 (basis of record)
Actinocyclus octonarius var. sparsus (Gregory) Hendey, 1954 accepted as Eupodiscus sparsus Gregory, 1857 (basis of record)
Actinocyclus octonarius var. tenellus (Brébisson) Hendey, 1954 accepted as Eupodiscus tenellus Brébisson, 1854 (basis of record)
Actinocyclus ralfsii (W.Smith) Ralfs, 1861 accepted as Actinocyclus octonarius var. ralfsii (W.Smith) Hendey, 1954 accepted as Eupodiscus ralfsii var. ralfsii W. Smith, 1856 (additional source)
Actinocyclus ralfsii var. sparsa (Gregory) Ralfs in Pritchard, 1861 accepted as Actinocyclus octonarius var. sparsus (Gregory) Hendey, 1954 accepted as Eupodiscus sparsus Gregory, 1857 (additional source)
Actinocyclus roperi (Brébisson) Grunow ex Van Heurck, 1881 accepted as Eupodiscus roperi Brébisson, 1870 (basis of record)
Actinocyclus senarius Ehrenberg, 1838 (additional source)
Actinocyclus subtilis (W.Gregory) Ralfs, 1861 (basis of record)
Actinoptychus amblyoceros (Ehrenberg) A.Schmidt, 1874 (basis of record)
Actinoptychus senarius (Ehrenberg) Ehrenberg, 1843 accepted as Actinocyclus senarius Ehrenberg, 1838 (additional source)
Actinoptychus splendens (Shadbolt) Ralfs ex Pritchard, 1861 (basis of record)
Actinoptychus undulatus (J.W.Bailey) Ralfs, 1861 accepted as Actinoptychus senarius (Ehrenberg) Ehrenberg, 1843 accepted as Actinocyclus senarius Ehrenberg, 1838 (additional source)
Amphipleura F.T. Kützing, 1844 (additional source)

 Classification

 for Chaetoceros affinis var. willei (Gran) Hustedt, 1930

Synonymised with Chaetoceros willei according to B. Hartley. [details]

 Identification

 for Achnanthes lanceolata var. elliptica Cleve, 1891

Considerd as a variety Achnanthes laceolata var elliptica [details]

 Identification

 for Amphora laevis var. laevissima (Gregory) Cleve, 1896

Considered as a variety instead of subspecies: Amphora laevis var leavissima (Gregory) Cleve, 1896 [details]

 Spelling

 for Amphora dubia Gregory, 1857

Amphora dibia Gregory, 1857 [details]

 Spelling

 for Chaetoceros borealis var. densum Cleve, 1897

Referred to as Chaetoceros borealis densus by B. Hartly. [details]

 Spelling

 for Chaetoceros ceratosporus Ostenfeld, 1910

Spelled as Chaetoceros ceratosporus. [details]

 Spelling

 for Chaetoceros contortus Schütt, 1895

Spelled as Chaetoceros contortus [details]

 Spelling

 for Chaetoceros ingolfianus Ostenfeld, 1902

Spelled as Chaetoceros ingolfianus [details]

 Synonymy

 for Amphora excisa Gregory, 1857

synonymised with Amphora laevis [details]

 Synonymy

 for Amphora quadrata Gregory, 1857

Synonymised with Amphora pussio [details]

 Synonymy

 for Auricula staurophora Karsten, 1889

Synonymised with Auricula minuta [details]

 Synonymy

 for 

It concerns the following synonymised species: Chaetoceros gracilis sensu Apstein, 1909, non Schütt, 1895, nec ... [details]