Marstoniopsis insubrica

Marstoniopsis insubrica is a species of minute freshwater snail with an operculum, an aquatic gastropod mollusk or micromollusk in the family Amnicolidae.

This is a critically endangered species.

Distribution
This species lives in some areas in Northern, Western, Central, and Eastern Europe, including:
 * Germany - critically endangered (vom Aussterben bedroht)
 * Great Britain, rare

Habitat
This tiny snail does not tolerate running water; it prefers lakes and quiet areas within large rivers and canals.