| Nominal Species (n = 4) | Present allocation (n = 3) | Ref. |
|---|---|---|
| Posidonia australis Hooker, 1858 | Posidonia australis | 3477 |
| Posidonia coriacea Cambridge & Kuo, | Posidonia ostenfeldii | 3477 |
| Posidonia oceanica (Linnaeus) Delile, 1813 | Posidonia oceanica | 3477 |
| Posidonia ostenfeldii den Hartog, 1970 | Posidonia ostenfeldii | 3477 |