1. Species Synedra closterioides Grunow, 1881
2. Species Synedra crystallina (C.Agardh) Kützing, 1844
3. Species Synedra familiaris Kützing, 1844
4. Species Synedra fulgens (Greville) W.Smith, 1853
5. Species Synedra minutissima Kützing, 1844
6. Species Synedra nana F.Meister, 1912
7. Species Synedra parva Kützing
8. Species Synedra pulchella Kützing, 1844
9. Species Synedra toxoneides Castracane
10. Species Synedra ulna (Nitzsch) Ehrenberg, 1832
11. Species Synedra actinastroides Lemmermann, 1900 accepted as Nitzschia holsatica Hustedt, 1930 (synonym)
12. Species Synedra affinis Kützing, 1844 accepted as Tabularia fasciculata (C.Agardh) D.M.Williams & Round, 1986 (synonym)
13. Species Synedra amphicephala Kützing, 1844 accepted as Fragilaria amphicephaloides Lange-Bertalot, 2013
14. Species Synedra amphirhynchus Ehrenberg, 1843 accepted as Ulnaria amphirhynchus (Ehrenberg) Compère & Bukhtiyarova, 2006 accepted as Synedra amphirhynchus var. amphirhynchus Ehrenberg, 1843 (synonym)
15. Species Synedra berolinensis Lemmermann, 1900 accepted as Belonastrum berolinensis (Lemmermann) Round & Maidana, 2001 accepted as Synedra berolinensis var. berolinensis Lemmermann, 1900 (synonym)
16. Species Synedra biceps Kützing, 1844 accepted as Ulnaria biceps (Kützing) P.Compère, 2001 accepted as Synedra biceps f. biceps Kützing, 1844 (synonym)
17. Species Synedra bilunaris Ehrenberg, 1832 accepted as Eunotia bilunaris (Ehrenberg) Schaarschmidt, 1880 accepted as Synedra bilunaris var. bilunaris Ehrenberg, 1832 (basionym)
18. Species Synedra capitata Ehrenberg, 1836 accepted as Ulnaria capitata (Ehrenberg) P.Compère, 2001 accepted as Synedra capitata f. capitata Ehrenberg, 1836 (synonym)
19. Species Synedra delicatissima W.Smith, 1853 accepted as Ulnaria delicatissima (W.Smith) M.Aboal & P.C.Silva, 2004 accepted as Synedra delicatissima f. delicatissima W. Smith, 1853 (synonym)
20. Species Synedra dissipata Kützing, 1844 accepted as Nitzschia dissipata (Kützing) Rabenhorst, 1860 accepted as Synedra dissipata var. dissipata Kützing, 1844 (Basionym)
21. Species Synedra fasciculata (Agardh) Kützing accepted as Tabularia fasciculata (C.Agardh) D.M.Williams & Round, 1986 (Synonym)
22. 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)
23. Species Synedra hyperborea Grunow, 1884 accepted as Synedropsis hyperborea (Grunow) G.R.Hasle, L.K.Medlin & E.E.Syvertsen, 1994 accepted as Synedra hyperborea var. hyperborea Grunow, 1884 (synonym)
24. Species Synedra longissima W.Smith, 1853 accepted as Ulnaria longissima (W.Smith) Van de Vijver & D.M.Williams, 2022 (synonym)
25. Species Synedra nitzschioides Grunow, 1862 accepted as Thalassionema nitzschioides (Grunow) Mereschkowsky, 1902 (Basionym)
26. Species Synedra palea Kützing, 1844 accepted as Nitzschia palea (Kützing) W.Smith, 1856 (Basionym)
27. Species Synedra parasitica (W.Smith) Hustedt, 1930 accepted as Pseudostaurosira parasitica (W.Smith) Morales, 2003 (synonym)
28. Species Synedra provincialis Grunow accepted as Neosynedra provincialis (Grunow) D.M.Williams & Round, 1986 accepted as Synedra provincialis var. provincialis Grunow, 1877 (Basionym)
29. Species Synedra pulchella (Ralfs ex Kützing) Kützing, 1844 accepted as Ctenophora pulchella (Ralfs ex Kützing) D.M.Williams & Round, 1986 (synonym)
30. Species Synedra radians Kützing, 1844 accepted as Fragilaria radians (Kützing) D.M.Williams & Round, 1987 (synonym)
31. Species Synedra rumpens Kützing, 1844 accepted as Fragilaria capucina subsp. rumpens (Kützing) Lange-Bertalot, 1993 (synonym)
32. Species Synedra tabulata (C.Agardh) Kützing, 1844 accepted as Tabularia fasciculata (C.Agardh) D.M.Williams & Round, 1986 (Synonym)
33. Species Synedra vaucheriae (Kützing) Kützing, 1844 accepted as Fragilaria capucina var. vaucheriae (Kützing) Lange-Bertalot, 1980 accepted as Exilaria vaucheriae Kützing, 1833 (synonym)
34. Species Synedra acicularis Kützing, 1844 (uncertain > unassessed)
35. Species Synedra acula Kützing, 1844 (uncertain > unassessed)
36. Species Synedra acus Kützing, 1844 accepted as Synedra radians var. radians Kützing, 1844 (uncertain > unassessed)
37. Species Synedra acus Ehrenberg, 1854 (uncertain > unassessed)
38. Species Synedra amphicephala sensu H.L. Smith, 1874-1879 (uncertain > unassessed)
39. Species Synedra biceps W.Smith, 1853 (uncertain > unassessed)
40. Species Synedra constricta Kützing, 1844 (uncertain > unassessed)
41. Species Synedra curvula Kützing, 1844 (uncertain > unassessed)
42. Species Synedra cymbelliformis A.Schmidt, 1874 (uncertain > unassessed)
43. Species Synedra danica Kützing, 1844 (uncertain > unassessed)
44. Species Synedra debilis Kützing, 1844 (uncertain > unassessed)
45. Species Synedra fasciculata Ehrenberg, 1832 (uncertain > unassessed)
46. Species Synedra frustulum Kützing, 1844 (uncertain > unassessed)
47. Species Synedra inflata Heiden, 1900 accepted as Staurosira inflata (Heiden) A.Rusanov, Ács, E. Morales & Ector in Rusanov et al., 2018 (uncertain > unassessed)
48. Species Synedra lunaris W. Smith, 1853 (uncertain > unassessed)
49. Species Synedra nitzschioides Maly, 1895 (uncertain > unassessed)
50. Species Synedra pusilla Kützing, 1844 (uncertain > unassessed)
51. Species Synedra radians W. Smith, 1853 (uncertain > unassessed)
52. Species Synedra scalaris Ehrenberg, 1843 (uncertain > unassessed)
53. Species Synedra sigma Kützing, 1844 (uncertain > unassessed)
54. Species Synedra spectabilis Ehrenberg, 1841 (uncertain > unassessed)
55. Species Synedra subarcuata Naegeli ex Kützing, 1849 (uncertain > unassessed)
56. Species Synedra utermoehlii Hustedt, 1932 (uncertain > unassessed)

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