Nudibranchs and Sea Slugs Genus
| Genus | Family | Sample species | # Species |
|---|---|---|---|
| Facelinopsis | Facelinidae | 1 | |
| Favorinus | Glaucidae | 8 | |
| Felimare | Chromodorididae | 1 | |
| Fiona | Fionidae | 1 | |
| Flabellina | Flabellinidae | 41 | |
| Galeojanolus | Zephyrinidae | 1 | |
| Gargamella | Discodorididae | 1 | |
| Gastropteron | Gastropteridae | 4 | |
| Geitodoris | Dorididae | 7 | |
| Glaucus | Glaucidae | 2 | |
| Glossodoris | Chromodorididae | 29 | |
| Godiva | Glaucidae | 3 |