Plegma
Plegma is a genus of minute, air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family Helicarionidae. Species
Species within the genus Plegma include:
 Plegma caelatura (Férussac, 1821)
 Plegma duponti (Morelet, 1866)

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Helicarionidae
Gastropods described in 1911