1. Species Synedra balthica Ehrenberg, 1832
2. Species Synedra camtschatica Grunow, 1862
3. Species Synedra closterioides Grunow, 1881
4. Species Synedra crystallina (C.Agardh) Kützing, 1844
5. Species Synedra fulgens (Greville) W.Smith, 1853
6. Species Synedra gallionii
7. Species Synedra parva Kützing
8. Species Synedra pulchella Kützing, 1844
9. Species Synedra superba Kützing, 1844
10. Species Synedra toxoneides Castracane
11. Species Synedra affinis Kützing, 1844 accepted as Tabularia fasciculata (C.Agardh) D.M.Williams & Round, 1986 (synonym)
12. Species Synedra bilunaris Ehrenberg, 1832 accepted as Eunotia bilunaris (Ehrenberg) Schaarschmidt, 1880 accepted as Synedra bilunaris var. bilunaris Ehrenberg, 1832 (basionym)
13. Species Synedra dissipata Kützing, 1844 accepted as Nitzschia dissipata (Kützing) Rabenhorst, 1860 accepted as Synedra dissipata var. dissipata Kützing, 1844 (Basionym)
14. Species Synedra formosa Hantzsch, 1863 accepted as Ardissonea formosa (Hantzsch) Grunow (synonym)
15. Species Synedra gaillonii (Bory de Saint-Vincent) Ehrenberg, 1830 accepted as Tabularia gaillonii (Bory de Saint-Vincent) Bukhtiyarova, 1995 accepted as Navicula gaillonii Bory de Saint-Vincent, 1824 (synonym)
16. Species Synedra gaussi Heiden, 1928 accepted as Nitzschia marina Grunow, 1880
17. Species Synedra hennedyana Gregory, 1857 accepted as Toxarium hennedyanum (Gregory) Pelletan, 1889
18. Species Synedra laevigata Grunow accepted as Hyalosynedra laevigata (Grunow) Williams & Round, 1986 (synonym)
19. Species Synedra nitzschioides Grunow, 1862 accepted as Thalassionema nitzschioides (Grunow) Mereschkowsky, 1902 (Basionym)
20. Species Synedra palea Kützing, 1844 accepted as Nitzschia palea (Kützing) W.Smith, 1856 (Basionym)
21. Species Synedra pulchella (Ralfs ex Kützing) Kützing, 1844 accepted as Ctenophora pulchella (Ralfs ex Kützing) D.M.Williams & Round, 1986 (synonym)
22. Species Synedra robusta Ralfs ex Pritchard, 1861 accepted as Ardissonea robusta (Ralfs ex Pritchard) De Notaris, 1871 accepted as Synedra robusta f. robusta Ralfs in Pritchard, 1861 (synonym)
23. Species Synedra sicula Castercane accepted as Nitzschia sicula (Castracane) Hustedt
24. Species Synedra tabulata (C.Agardh) Kützing, 1844 accepted as Tabularia fasciculata (C.Agardh) D.M.Williams & Round, 1986 (Synonym)
25. Species Synedra thalassiothrix Cleve, 1873 accepted as Thalassiothrix longissima Cleve & Grunow, 1880
26. Species Synedra doliolus Wallich, 1860 represented as Fragilariopsis doliolus (Wallich) Medlin & P.A.Sims, 1993 (Homotypic Synonym)
27. Species Synedra acicularis Kützing, 1844 (uncertain > unassessed)
28. Species Synedra acicularis W.Smith, 1853 (uncertain > unassessed)
29. Species Synedra biceps W.Smith, 1853 (uncertain > unassessed)
30. Species Synedra capitulata Castracane, 1886 (uncertain > unassessed)
31. Species Synedra constricta Kützing, 1844 (uncertain > unassessed)
32. Species Synedra cymbelliformis A.Schmidt, 1874 (uncertain > unassessed)
33. Species Synedra debilis Kützing, 1844 (uncertain > unassessed)
34. Species Synedra fragilarioides Hargraves & Guillard, 1974 (uncertain > unassessed)
35. Species Synedra fragilis Manguin, 1957 (uncertain > unassessed)
36. Species Synedra frustulum Kützing, 1844 (uncertain > unassessed)
37. Species Synedra gigantea Lobarzewsky, 1840 (uncertain > unassessed)
38. Species Synedra gomphonema Janisch & Rabenhorst, 1863 (uncertain > unassessed)
39. Species Synedra hantzschiana Sournia, 1963 (uncertain > unassessed)
40. Species Synedra indica F.J.R.Taylor, 1967 (uncertain > unassessed)
41. Species Synedra inflata Heiden, 1900 accepted as Staurosira inflata (Heiden) A.Rusanov, Ács, E. Morales & Ector in Rusanov et al., 2018 (uncertain > unassessed)
42. Species Synedra lata (Giffen) A.Witkowski, 2000 (uncertain > unassessed)
43. Species Synedra nitzschioides Maly, 1895 (uncertain > unassessed)
44. Species Synedra pelagica Hendey, 1937 (uncertain > unassessed)
45. Species Synedra pusilla Kützing, 1844 (uncertain > unassessed)
46. Species Synedra reinboldii Van Heurck, 1909 (uncertain > unassessed)
47. Species Synedra sigma Kützing, 1844 (uncertain > unassessed)
48. Species Synedra sigmoidea (Nitzsch) Kützing, 1844 accepted as Bacillaria sigmoidea Nitzsch, 1817 (uncertain > unassessed)
49. Species Synedra smithii Ralfs, 1861 (uncertain > unassessed)
50. Species Synedra spectabilis Ehrenberg, 1841 (uncertain > unassessed)
51. Species Synedra undulata (J.W.Bailey) Gregory, 1857 accepted as Toxarium undulatum Bailey, 1854 (uncertain > unassessed)

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