Mud Snail

Durham Priority Species
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Mud Snail Action Plan

Priority Species: Mud Snail – Omphiscola glabra


  1. Maintain and where possible, extend the current population size and distribution of mud snail in the DBAP area.

Vision Statement: To halt decline in numbers and distribution and to look for opportunities to expand its range

Target Type Unit Value
1. To maintain range of Omphiscola glabra on its one known site in the Durham BAP area. maintain sites 1

The mud snail Omphiscola glabra is a snail of temporary ponds and ditches.

It was formerly fairly widely distributed throughout the acidic lowland areas of England, Wales and Scotland as far as Perth. It is now rare, with the largest concentration of records coming from the southern part of the Vale of York. This species has become extinct over large parts of lowland England and shows continuing decline.

Little is known about the distribution of the mud snail in the Durham BAP area; no systematic survey has been carried out and the only information available is in the form of isolated reports (mostly old).


  • Habitat loss due to drainage is perhaps the main cause in decline of the mud snail which prefers small muddy pools and ditches.
  • Fragmentation of habitat prevents local recolonisation.
  • Agricultural practices which lead to chemical or organic eutrophication.
  • Inappropriate management of ditches and ponds, often for the benefit of other wildlife