American Bladder Snail - Physella acuta

Alternative names
Physa acuta

Up to 18mm long with a pointed turret and large flared mouth which joins the main shell at close to a right angle. As with other Physa species it is sinistral

Similar Species

Physa fontinalis has a much less pointed shell and the mouth joins the main shell at an acute angle.

Identification difficulty
ID guidance
  • sinistral (left hand coil)
  • large flared mouth - joining at nearly a right angle

Rivers and lakes, can tolerate some pollution.

When to see it

All year.

Life History

This is an introduced species. It feeds on dead plant and animal matter, rather than algae which most snails feed on.

UK Status

Widespread and relatively common particularly in the south.

VC55 Status

Uncommon and/or under-recorded.

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Leicestershire & Rutland Map


Yellow squares = NBN records (all known data)
Coloured circles = NatureSpot records: 2020+ | 2015-2019 | pre-2015

UK Map