1. Subgenus Posidonomya (Bositra) de Gregorio, 1886 † accepted as Bositra de Gregorio, 1886 † (unaccepted > superseded rank)
2. Species Posidonomya alta Mojsisovics, 1873 † accepted as Posidonomya pannonica Mojsisovics, 1873 † accepted as Peribositria pannonica (Mojsisovics, 1873) † (unaccepted > junior subjective synonym)
3. Species Posidonomya aurita Hauer, 1851 † accepted as Claraia aurita (Hauer, 1851) † (unaccepted > superseded combination)
4. Species Posidonomya clarae Emmrich, 1844 † accepted as Claraia clarae (Emmrich, 1844) †
5. Species Posidonomya clarai [auct] † accepted as Posidonomya clarae Emmrich, 1844 † accepted as Claraia clarae (Emmrich, 1844) † (unaccepted > unjustified emendation)
6. Species Posidonomya concinna T. R. Jones, 1901 † accepted as Concinella concinna (T. R. Jones, 1901) † (unaccepted > superseded combination)
7. Species Posidonomya linguloides Khalfin, 1939 † accepted as Abiella linguloides (Khalfin, 1939) † (unaccepted > superseded combination)
8. Species Posidonomya magniforma (Ragozin, 1935) † accepted as Mrassiella magniforma Ragozin, 1935 † (unaccepted > superseded combination)
9. Species Posidonomya nodosocostata Giebel, 1857 † accepted as Estheriella nodosocostata (Giebel, 1857) † (unaccepted > superseded combination, not a bivalve but a crustacean)
10. Species Posidonomya pannonica Mojsisovics, 1873 † accepted as Peribositria pannonica (Mojsisovics, 1873) † (unaccepted > superseded combination)
11. Species Posidonomya striata Stevens, 1858 † accepted as Dunbarella striata (Stevens, 1858) † (unaccepted > superseded combination)
12. Species Posidonomya subovata T. R. Jones, 1901 † accepted as Prilukiella subovata (T. R. Jones, 1901) † (unaccepted > superseded combination)
13. Species Posidonomya tomiensis Ragozin, 1931 † accepted as Prilukiella tomiensis (Ragozin, 1931) † (unaccepted > superseded combination)
14. Species Posidonomya venusta Münster, 1840 † accepted as Guerichia venusta (Münster, 1840) † (unaccepted > superseded combination)
15. Species Posidonomya bononiensis de Loriol, 1875 † (uncertain > unassessed)
16. Species Posidonomya devonica Walcott, 1884 † (uncertain > unassessed)
17. Species Posidonomya hausmanni Bornemann, 1854 † (uncertain > taxon inquirendum, not a mollusk, but a conchostracan of uncertain placement)
18. Species Posidonomya laevis Walcott, 1884 † (uncertain > unassessed)
19. Species Posidonomya wengenensis Giebel, 1857 † (uncertain > unassessed)
20. Species Posidonomya wengensis Wissmann, 1841 † (uncertain > unassessed)

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