Nystia is an extinct genus of fossil freshwater snails, aquatic gastropod molluscs in the family Truncatellidae.

[1][3] The genus Nystia was previously classified within the Stenothyridae or the Micromelaniidae.

[1][3] The distribution of the genus Nystia includes France[1] and the Czech Republic.

Species in the genus Nystia include:

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