- Posidonia angustifolia Cambridge & Kuo, 1979
- Posidonia australis J.D.Hooker, 1858
- Posidonia caulinii K.D.Koenig, 1805 accepted as Posidonia oceanica (Linnaeus) Delile, 1813
- Posidonia coriacea Cambridge & Kuo accepted as Posidonia ostenfeldii Hartog, 1970
- Posidonia denhartogii Kuo & Cambridge, 1984
- Posidonia oceanica (Linnaeus) Delile, 1813
- Posidonia ostenfeldii Hartog, 1970
- Posidonia robertsoniae Kuo & Cambridge, 1984 accepted as Posidonia ostenfeldii Hartog, 1970
- Posidonia sinuosa Cambridge & Kuo, 1979