1. Species Posidonia lata Betekhtina, 1979 † (accepted > unreplaced junior homonym, junior homonym of Posidonia lata Studer, 1838)
2. Species Posidonia buchii Roemer, 1836 † accepted as Bositra buchii (Roemer, 1836) † (unaccepted > superseded combination, original combination)
3. Species Posidonia minuta Zieten, 1833 † accepted as Euestheria minuta (Zieten, 1833) † (unaccepted > superseded combination, not a mollusk)
4. Species Posidonia ornati Quenstedt, 1851 † accepted as Bositra ornati (Quenstedt, 1851) † (unaccepted > superseded combination)
5. Species Posidonia somaliensis L. R. Cox, 1935 † accepted as Bositra buchii (Roemer, 1836) † (unaccepted > junior subjective synonym)
6. Species Posidonia anomala Münster, 1835 † (uncertain > unassessed)
7. Species Posidonia bronnii Zieten, 1833 † (uncertain > unassessed)
8. Species Posidonia canaliculata Goldfuss, 1835 † (uncertain > unassessed)
9. Species Posidonia gigantea Münster, 1835 † (uncertain > unassessed)
10. Species Posidonia orbicularis Münster, 1835 † (uncertain > unassessed)
11. Species Posidonia qijiagouensis Z.-R. Yang, 1983 † (uncertain > unassessed)
12. Species Posidonia radiata Goldfuss, 1835 † (uncertain > unassessed)
13. Species Posidonia socialis Münster, 1835 † (uncertain > unassessed)
14. Species Posidonia tamugangensis Z.-R. Yang, 1983 † (uncertain > unassessed)

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