| 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 |
| Meuniera P.C. Silva, 1996 |
| Meuniera membranacea (Cleve) P.C. Silva, 1996 |
| Plagiotropis Pfitzer, 1871 |
| Plagiotropis antarctica (Cleve) Kuntze, 1898 |
| Plagiotropis lepidoptera (W. Greg.) Kuntze, 1898 |
| Plagiotropis lepidoptera var. lepidoptera (W. Greg.) Kuntze, 1898 |
| Plagiotropis lepidoptera var. minor (H. Perag. & M. Perag) Hendey, 1964 |
| Plagiotropis lepidoptera var. proboscidea (Cleve) Reimer, 1975 |
| Plagiotropis maxima (W. Greg.) Kuntze, 1898 |