Classification of the subgenus Placuna (Ephippium)
Subg. Placuna (Ephippium) Röding 1798
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Placuna (Ephippium) ephippium Philipsson 1788
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Invalid names: Anomia sella Gmelin 1791 [synonym], Ephippium polonicum Röding 1798 [synonym], Placuna papyracea Lamarck 1819 [synonym], Placuna quadrangula Philipsson 1788 [synonym]
†Placuna (Ephippium) lincolnii Gray 1849
†Placuna (Ephippium) lobata Sowerby 1871