1. Species Achnanthes acus Simonsen ex F.Hinz et al., 2012
2. Species Achnanthes adnata Bory, 1822
3. Species Achnanthes agglutinata Grunow in Cleve & Grunow, 1880
4. Species Achnanthes ambigua S.J.C.Zimmermann, 1918
5. Species Achnanthes apiculata (Greville, 1859)
6. Species Achnanthes arcuata (Lyngb.) Kütz., 1833
7. Species Achnanthes arenaria Amossé, 1941
8. Species Achnanthes arenicola J.W.Bailey, 1851
9. Species Achnanthes arguta Hust.ex Simonsen, 1987
10. Species Achnanthes armillaris (O.F.Müller) Guiry, 2019
11. Species Achnanthes bacescui Bodeanu, 1976
12. Species Achnanthes bacillaris Ehrenberg, 1844
13. Species Achnanthes bengalensis Grunow in Cleve & Grunow, 1880
14. Species Achnanthes brevipes C.Agardh, 1824
15. Species Achnanthes eureka Álvarez-Blanco & S.Blanco, 2014
16. Species Achnanthes gainii (M. Peragallo) Mann, 1937
17. Species Achnanthes longipes C.Agardh, 1824
18. Species Achnanthes pseudobrevipes Aleem, 1950
19. Species Achnanthes secretitaeniata Toyoda, Tanaka & Williams, 2009
20. Species Achnanthes trachyderma (F.Meister, 1934)
21. Species Achnanthes vistulana A. Witkowski, 1994
22. Species Achnanthes agardhi (Kütz.) Cleve & J.D.Möller accepted as Achnanthes brevipes var. seriata (Agardh) Cleve, 1895 accepted as Achnanthes seriata C.Agardh, 1827 (Based on an illegitimate name)
23. Species Achnanthes arctica (Cleve) A.Cleve, 1915 accepted as Achnanthes brevipes var. arctica (P. T. Cleve) T. Ko-Bayashi, 1965 accepted as Achnanthidium arcticum Cleve, 1873 (Synonym)
24. Species Achnanthes lilljeborgei Grunow, 1881 accepted as Planothidium lilljeborgei (Grunow) Witkowski accepted as Achnanthes lilljeborgii Grunow, 1881
25. Species Achnanthes pseudoconica Foged accepted as Achnanthes pseudoconspicua Foged, 1972 (misspelling)
26. Species Achnanthes schwabei Krasske, 1939 accepted as Planothidium schwabei (Krasske) H. Lange-Bertalot in U. Rumrich, H. Lange-Bertalot & M. Rumrich, 2000
27. Species Achnanthes speciosa Hustedt, 1927 accepted as Haloroundia speciosa (Hustedt) Diaz & Maidana (unaccepted > junior objective synonym)
28. Species Achnanthes taeniata Grunow, 1880 accepted as Pauliella taeniata (Grunow) F.E.Round & P.W.Basson, 1997
29. Species Achnanthes controversa Hustedt, 1937 (uncertain > unassessed)
30. Species Achnanthes convergens H.Kobayasi ex H.Kobayshi, Nagumo & Mayama, 1986 (uncertain > unassessed)
31. Species Achnanthes corrupta Giffen, 1984 (uncertain > unassessed)
32. Species Achnanthes curvirostrum J.Brun, 1895 (uncertain > unassessed)
33. Species Achnanthes delicatula (Kützing) Brun, 1880 accepted as Achnanthidium delicatulum f. delicatulum Kützing, 1844 (uncertain > unassessed)
34. Species Achnanthes diplopunctata Simonsen, 1959 (uncertain > unassessed)
35. Species Achnanthes fimbriata (Grunow) R.Ross, 1963 accepted as Schizostauron fimbriatum Grunow, 1867 (uncertain > unassessed)
36. Species Achnanthes fonticola Hustedt, 1945 (uncertain > unassessed)
37. Species Achnanthes georgica Reinsch, 1890 (uncertain > unassessed)
38. Species Achnanthes groenlandica (Cleve) Grunow, 1880 (uncertain > unassessed)
39. Species Achnanthes grubei Simonsen, 1987 (uncertain > unassessed)
40. Species Achnanthes hauckiana Grunow, 1880 (uncertain > unassessed)
41. Species Achnanthes hustedtii Bily & Marvan, 1959 (uncertain > unassessed)
42. Species Achnanthes marina Hustedt, 1937 (uncertain > unassessed)
43. Species Achnanthes meisteri Hustedt ex R.Simonsen, 1987 (uncertain > unassessed)
44. Species Achnanthes naviformis Van de Vijver & Beyens in Van de Vijver et al., 2002 (uncertain > unassessed)
45. Species Achnanthes pachypus Montagne, 1839 (uncertain > unassessed)
46. Species Achnanthes pictii J.R.Carter, 1963 (uncertain > unassessed)
47. Species Achnanthes promunturii Giffen, 1970 (uncertain > unassessed)
48. Species Achnanthes pseudobliqua Simonsen, 1960 (uncertain > unassessed)
49. Species Achnanthes pseudolongipes K.Toyoda & T.Nagumo, 2010 (uncertain > unassessed)
50. Species Achnanthes radiata Du & Cheng, 1984 (uncertain > unassessed)
51. Species Achnanthes seriata C.Agardh, 1827 (uncertain > unassessed)
52. Species Achnanthes solea Hustedt, 1952 (uncertain > unassessed)
53. Species Achnanthes subinflata (Østrup) Cleve-Euler, 1953 accepted as Achnanthes lanceolata var. subinflata Østrup, 1918 (uncertain > unassessed)
54. Species Achnanthes temperei M.Peragallo, 1908 (uncertain > unassessed)
55. Species Achnanthes tenuis Hustedt, 1955 (uncertain > unassessed)
56. Species Achnanthes valida Hustedt ex R.Simonsen, 1987 (uncertain > unassessed)
57. Species Achnanthes vicentii Manguin, 1957 (uncertain > unassessed)
58. Species Achnanthes wellsiae Reimer, 1966 (uncertain > unassessed)
59. Species Achnanthes yaquinensis McIntire & Reimer, 1974 (uncertain > unassessed)

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