Ephippium anomia Röding, 1798 accepted as Placuna quadrangula (Philipsson, 1788)
Ephippium polonicum Röding, 1798 accepted as Placuna ephippium (Philipsson, 1788)
Ephippium transparens Röding, 1798 accepted as Placuna placenta (Linnaeus, 1758)
Placenta (Placenta) orbicularis Philipsson, 1788 accepted as Placenta orbicularis Philipsson, 1788 accepted as Placuna placenta (Linnaeus, 1758)
Placenta (Placuna) lincolnii J. E. Gray, 1849 accepted as Placuna lincolnii (J. E. Gray, 1849)
Placenta (Placuna) sella (Gmelin, 1791) accepted as Placuna sella (Gmelin, 1791) accepted as Placuna ephippium (Philipsson, 1788)
Placenta auriculata Mörch, 1853 accepted as Placuna placenta (Linnaeus, 1758)
Placenta communis Megerle von Mühlfeld, 1811 accepted as Placuna placenta (Linnaeus, 1758)
Placenta ephippium Philipsson, 1788 accepted as Placuna ephippium (Philipsson, 1788)
Placenta orbicularis Philipsson, 1788 accepted as Placuna placenta (Linnaeus, 1758)
Placenta papyracea (Lamarck, 1819) accepted as Placuna papyracea Lamarck, 1819 accepted as Placuna quadrangula (Philipsson, 1788)
Placenta patinata Guppy, 1911 † (unaccepted > nomen nudum )
Placenta quadrangula Philipsson, 1788 accepted as Placuna quadrangula (Philipsson, 1788)
Placuna ephippium (Philipsson, 1788)
Placuna lincolnii (Gray, 1849) sensu Lamprell & Whitehead, 1992 accepted as Placuna quadrangula (Philipsson, 1788)
Placuna lincolnii (J. E. Gray, 1849)
Placuna lobata G. B. Sowerby II, 1871
Placuna mandirantjanensis K. Martin, 1909 †
Placuna nodulosa Zieten, 1832 † (uncertain > unassessed )
Placuna orbicularis (Philipsson, 1788) accepted as Placuna placenta (Linnaeus, 1758)
Placuna papyracea Lamarck, 1819 accepted as Placuna quadrangula (Philipsson, 1788)
Placuna placenta (Linnaeus, 1758)
Placuna planicostata Dunker, 1879 accepted as Placuna lobata G. B. Sowerby II, 1871
Placuna pseudoplacenta K. Martin, 1909 †
Placuna quadrangula (Philipsson, 1788)
Placuna sella (Gmelin, 1791) accepted as Placuna ephippium (Philipsson, 1788)
Placuna solida Melleville, 1843 † accepted as Hemiplicatula solida (Melleville, 1843) †
Sellaria anglicana Link, 1807 accepted as Placuna ephippium (Philipsson, 1788)