| Gyrosigma exilis (Grunow) Reimer, 1966 |
| Gyrosigma eximium (Thwaites) Boyer, 1927 |
| Gyrosigma fasciola (Ehrenb.) J.W. Griff. & Henfr., 1856 |
| Gyrosigma fasciola var. arcuatum (Donk.) Cleve, 1894 |
| Gyrosigma fasciola var. fasciola (Ehrenb.) J.W. Griff. & Henfr., 1856 |
| Gyrosigma fasciola var. sulcatum (Grunow) Cleve, 1894 |
| Gyrosigma formosum (W. Sm.) J.W. Griff. & Henfr., 1856 |
| Gyrosigma hippocampus (Ehrenb.) Hassall, 1845 |
| Gyrosigma intermedium (W. Sm.) W. Griff, 1856 |
| Gyrosigma macrum (W. Sm.) J.W. Griff. & Henfr., 1855 |
| Gyrosigma nodiferum (Grunow) Reimer, 1966 |
| Gyrosigma obliquum (Grunow) Boyer, 1927 |
| Gyrosigma obscurum (W. Sm.) J.W. Griff. & Henfr., 1856 |
| Gyrosigma peisonis (Grunow) Hust., 1930 |
| Gyrosigma prolongatum (W. Sm.) J.W. Griff. & Henfr., 1855 |
| Gyrosigma rectum (Donk.) Cleve, 1894 |
| Gyrosigma reversum (W. Greg.) Hendey, 1986 |
| Gyrosigma scalproides (Rabenh.) Cleve, 1894 |
| Gyrosigma scalproides var. eximium (Thwaites) Cleve, 1894 |
| Gyrosigma sciotoense (Sullivant & Wormley) Cleve, 1894 |