| Gyrosigma simile (Grunow) Boyer, 1916 |
| Gyrosigma spenceri (W.Sm.) J.W. Griff. & Henfr., 1856 |
| Gyrosigma spenceri (Bailey ex E.J. Quekett) J.W. Griff. & Henfr., 1856 |
| Gyrosigma spenceri var. curvula (Grunow) Reimer, 1966 |
| Gyrosigma spenceri var. exilis (Grunow) A. Cleve, 1894 |
| Gyrosigma spenceri var. nodiferum (Grunow) Cleve, 1894 |
| Gyrosigma spenceri var. spenceri (Bailey ex E.J. Quekett) J.W. Griff. & Henfr., 1856 |
| Gyrosigma strigilis (W. Sm.) Cleve, 1894 |
| Gyrosigma strigosum (W. Sm.) J.W. Griff. & Henfr., 1856 |
| Gyrosigma tenuissimum (W. Sm.) J.W. Griff. & Henfr., 1855 |
| Gyrosigma wansbeckii (Donk.) Cleve, 1894 |
| Pleurosigma W. Sm., 1852 |
| Pleurosigma acutum Norman ex Ralfs, 1861 |
| Pleurosigma aestuarii (Bréb. ex Kütz.) W. Sm., 1853 |
| Pleurosigma angulatum W. Sm., 1852 |
| Pleurosigma angulatum var. genuinum Cleve-Euler, 1952 |
| Pleurosigma australe Grunow, 1867 |
| Pleurosigma australicum O.N. Witt, 1873 |
| Pleurosigma cuspidatum (Cleve) Cleve, 1894 |
| Pleurosigma decorum W. Sm., 1853 |