Mercuria confusa, common name the '"swollen spire snail", is a northern European species of small brackish water or freshwater snail with a gill and an operculum, an aquatic gastropod mollusk in the family Hydrobiidae.
This species only tolerates very low salinities, and is perhaps better characterized as a freshwater snail.
The 3-4 mm. high shell is fragile and translucent yellow-white in colour (but often coated with dark deposits).The animal is entirely and uniformly pale and has pale tentacles.Mercuria confusa has a proportionately larger body whorl than other hydrobiids.
This species occurs on the coasts of:
- "Swollen Spire Snail Mercuria confusa". Species Action Plan for Sussex. Sussex Biodiversity Partnership. Archived from the original on 24 June 2006. Retrieved 23 July 2014.
Media related to Mercuria confusa at Wikimedia Commons
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