1. Species Gyrosigma baculum W.E.Herwig & F.A.S.Sterrenburg, 2014
2. Species Gyrosigma balticum (Ehrenberg) Rabenhorst, 1853
3. Species Gyrosigma bigibbum Zanon, 1949
4. Species Gyrosigma cali G.Reid, 2003
5. Species Gyrosigma centropunctatum Yuhang Li, Nagumo et Kuidong Xu in Li et al., 2020
6. Species Gyrosigma coelophilum Okamoto & Nagumo, 2003
7. Species Gyrosigma dongzhaiense Yuhang Li, Nagumo et Kuidong Xu in Li et al., 2020
8. Species Gyrosigma gibbyae G.Reid, 2003
9. Species Gyrosigma murphyi G.Reid, 2003
10. Species Gyrosigma neglectum Frenguelli, 1938
11. Species Gyrosigma orbitum Thaler et Kaczmarska, 2009
12. Species Gyrosigma plagiostomum (Grunow) Cleve
13. Species Gyrosigma robustum (Grunow) Cleve, 1894
14. Species Gyrosigma scalproides (Rabenhorst) Cleve, 1894
15. Species Gyrosigma variipunctatum Hagelstein, 1939
16. Species Gyrosigma variistriatum Hagelstein, 1939
17. Species Gyrosigma virgata (Roper) Grunow, 1877
18. Species Gyrosigma vivax (W.Smith) M.Peragallo, 1908
19. Species Gyrosigma xiamenense Bing Liu, F.A.S. Sterrenburg & Bangqin Huang, 2015
20. Species Gyrosigma angustum (Donkin) Cleve, 1894 accepted as Carinasigma angustatum (Donkin) G.Reid, 2012 (synonym)
21. Species Gyrosigma elongatum (W.Smith) Griffith & Henfrey, 1856 accepted as Pleurosigma elongatum W.Smith, 1852 (synonym)
22. Species Gyrosigma normanii (Ralfs) Mann, 1907 accepted as Pleurosigma normanii Ralfs, 1861 (synonym)
23. Species Gyrosigma rectum (Donkin) Cleve, 1894 accepted as Carinasigma rectum (Donkin) G.Reid, 2012 (synonym)
24. Species Gyrosigma spencerii (Bailey ex Quekett) Griffith & Henfrey, 1856 accepted as Gyrosigma acuminatum (Kützing) Rabenhorst, 1853 (synonym)
25. Species Gyrosigma aestuarii (Brébisson ex Kützing) Griffith & Henfrey, 1856 accepted as Navicula aestuarii Brébisson ex Kützing, 1849 (uncertain > unassessed)
26. Species Gyrosigma diaphanum Cleve, 1894 (uncertain > unassessed)
27. Species Gyrosigma distortum (W.Smith) Griffith & Henfrey, 1856 accepted as Pleurosigma distortum var. distortum W. Smith, 1852 (uncertain > unassessed)
28. Species Gyrosigma elongatum (W.Smith) G.S.West, 1909 accepted as Pleurosigma elongatum var. elongatum W. Smith, 1852 (uncertain > unassessed)
29. Species Gyrosigma euhippus F.A.S.Sterrenburg & R.Ross, 1992 (uncertain > unassessed)
30. Species Gyrosigma fasciola (Ehrenberg) J.W.Griffith & Henfrey, 1856 accepted as Ceratoneis fasciola Ehrenberg, 1839 (uncertain > unassessed)
31. Species Gyrosigma gibbosum Ricard, 1975 (uncertain > unassessed)
32. Species Gyrosigma grovei (Peragallo) Cleve, 1894 accepted as Pleurosigma grovesii Cleve ex H. Peragallo, 1891 (uncertain > unassessed)
33. Species Gyrosigma hippocampus (Ehrenberg) Hassall, 1845 accepted as Navicula hippocampus var. hippocampus Ehrenberg, 1838 (uncertain > unassessed)
34. Species Gyrosigma hummii Hustedt, 1955 (uncertain > unassessed)
35. Species Gyrosigma limosum Sterrenburg & Underwood, 1997 (uncertain > unassessed)
36. Species Gyrosigma littorale (W.Smith) Griffith & Henfrey, 1856 accepted as Pleurosigma littorale var. littorale W. Smith, 1852 (uncertain > unassessed)
37. Species Gyrosigma nodiferum (Grunow) Reimer, 1966 accepted as Pleurosigma nodiferum Grunow, 1880 (uncertain > unassessed)
38. Species Gyrosigma obscurum (W.Smith) J.W.Griffith & Henfrey, 1856 (uncertain > unassessed)
39. Species Gyrosigma parvulum Hustedt, 1955 (uncertain > unassessed)
40. Species Gyrosigma peisonis (Grunow) Hustedt, 1930 accepted as Pleurosigma peisonis var. peisonis Grunow, 1860 (uncertain > unassessed)
41. Species Gyrosigma prolongatum (W.Smith) J.W.Griffith & Henfrey, 1856 accepted as Pleurosigma prolongatum var. prolongatum W. Smith, 1852 (uncertain > unassessed)
42. Species Gyrosigma quinnipiacii (M.Peragallo) Boyer, 1927 (uncertain > unassessed)
43. Species Gyrosigma scalprum (Gaillon) Sterrenburg, 2007 accepted as Navicula scalprum Gaillon, 1827 (uncertain > unassessed)
44. Species Gyrosigma spathulatum Ricard, 1975 accepted as Arcuatasigma spathulatum (Ricard) Lobban & G. Reid, 2018 (uncertain > unassessed)
45. Species Gyrosigma spectabile (Grunow) Cleve, 1894 (uncertain > unassessed)
46. Species Gyrosigma strigilis (W.Smith) J.W.Griffin & Henfrey, 1856 accepted as Pleurosigma strigilis f. strigilis W. Smith, 1852 (uncertain > unassessed)
47. Species Gyrosigma subangustum Hustedt, 1955 (uncertain > unassessed)
48. Species Gyrosigma temperei Cleve, 1893 (uncertain > unassessed)
49. Species Gyrosigma tenuirostrum (Grunow) Cleve-Euler, 1952 (uncertain > unassessed)
50. Species Gyrosigma tenuissimum (W.Smith) Griffith & Henfrey, 1856 accepted as Pleurosigma tenuissimum var. tenuissimum W. Smith, 1853 (uncertain > unassessed)
51. Species Gyrosigma terryanum (Peragallo) Cleve, 1894 accepted as Pleurosigma terryanum H.Peragallo, 1891 (uncertain > unassessed)
52. Species Gyrosigma tubicolum F.A.S.Sterrenburg & M.A.Tiffany, 2004 (uncertain > unassessed)

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