The German hairy snail (Trochulus hispidus) has become one of the most threatened mollusks in the United Kingdom. However, new conservation efforts could reverse this situation.
The race to save this elusive gastropod is already underway, with the participation of more than 100 volunteers in an urban mission led by Citizen Zoo and the Zoological Society of London (ZSL).
A hard-to-find species
With a size similar to a fingernail, locating these rare snails is no easy task. Despite its discreet presence, the German hairy snail is considered one of the most threatened mollusks in the country.
According to Joe Pecorelli, head of the ZSL’s freshwater conservation program, this “charming little snail” has inhabited riverbanks and wetlands for thousands of years. Although it was not officially recorded in Great Britain until 1982, fossilized remains indicate that it was already present since the Neolithic era and even during the last Ice Age, when Great Britain was still connected to the European continent.
Unique characteristics of the German hairy snail
The species’ name comes from the tiny fibers covering its shell, which allow it to retain moisture and cling to riverbank plants.
- Physical description: shell with tiny hairs, color varies from yellowish to brown with dark spots; yellowish-brown body.
- Biology: it is a terrestrial hermaphrodite gastropod, capable of reproducing through copulation and the use of a curious “love dart” in a process of sexual selection.
- Habitat and behavior: lives in riverbanks and wetlands of Europe; more active during twilight and nighttime; primarily feeds on plants and can become a pest in nurseries and gardens.
- Adaptations: the hairs on its shell help it adhere to plants and, in winter, it can take refuge in bird plumage.
Ecological importance
The German hairy snail plays a fundamental role in ecosystems:
- Nutrient recycler in sediments and soils, promoting plant growth.
- Soil aeration, improving water and oxygen filtration.
- Seed and fungal spore dispersal, contributing to ecosystem health.
Threats and conservation
The population of this snail has significantly declined due to habitat loss and pollution. In the United Kingdom, the species is believed to be limited to a few fragmented patches along the River Thames.
Current surveys aim to better understand its distribution and guide conservation actions. Pecorelli emphasizes that these studies not only ensure the future of the snail but also help safeguard London’s green spaces for future generations.
So far, the team has found specimens in places like Richmond upon Thames, Iselworth Ait, and Kew, with the support of partners such as London Wildlife Trust, the Conchological Society of Great Britain, and the Port of London Authority.
A collective effort
Elliot Newton, rewilding director at Citizen Zoo, celebrated the discovery of their first German hairy snail and described the species as “beautiful, with a curious appearance.” For Newton, the surveys demonstrate that by working together with local communities and multiple partners, it is possible to better understand London’s hidden biodiversity and take concrete steps to protect it.
The German hairy snail, with its hair-covered shell and ecological role as a nutrient recycler, is much more than a discreet mollusk: it is an indicator of the health of urban and rural ecosystems. Its conservation requires coordinated efforts among scientists, volunteers, and local communities.
The mission in London is an example of how citizen science can become a powerful tool to protect threatened species and ensure that even the smallest creatures continue to fulfill their vital role in the natural balance.
