mouse-eared snail

Myosotella myosotis is a small air-breathing snail belonging to the family Ellobiidae, rarely exceeding a centimetre in shell length, with an elongated, spire-shaped shell marked by fine ribbing. It inhabits the upper intertidal zone of salt marshes and estuarine margins, sheltering among vegetation, driftwood, and debris at the high-tide line, where it emerges to feed on decaying plant matter and algal films. As a detritivore, it contributes to the breakdown of organic material within marsh ecosystems and serves as a food source for shorebirds and other small predators.

The species has an unusually broad distribution for a salt-marsh specialist, occurring along coastlines of Western Europe, the Mediterranean and Black Sea basins, parts of North and West Africa, and across the Atlantic and Pacific in scattered island and mainland locations, including the Americas, the Caribbean, and Australasia. This range reflects its tolerance of brackish conditions and likely historical dispersal via ballast water or attached vegetation.

Its habitat is under sustained pressure. Coastal development and land reclamation have reduced available marsh habitat, while rising sea levels and increased erosion are eroding remaining sites. Agricultural and urban runoff degrades water quality in estuarine systems, and storm surges associated with extreme weather events cause direct habitat loss. Competition from invasive species established in salt marshes further compounds these pressures.

Conservation efforts remain limited and largely indirect, arising from broader wetland and salt-marsh protection initiatives, estuarine restoration projects, and coastal management policies in several range countries. No species-specific recovery programs are widely documented. Population trends are currently unknown, and given the ongoing, cumulative nature of habitat threats across its range, the species' long-term outlook remains uncertain without targeted monitoring and habitat safeguards.

The mouse-eared snail inhabits salt marshes, mudflats, and brackish water environments along temperate coastlines, particularly favoring areas with mixed salinity where freshwater meets marine systems. It requires specific microhabitats within the intertidal zone where organic detritus accumulates and salinity levels fluctuate with tidal cycles.