The natural ecosystems of Gran Canaria are highly deteriorated, a situation which has had negative impacts on a variety of endemic species (4). Habitat loss has drastically reduced the range of Hemicycla saulcyi, and the species is now restricted to a small, isolated population occupying a total area of under four square kilometres (2) (4) (5) (6). Most of La Isleta is an old military base, which has so far prevented encroachment by the city of Las Palmas de Gran Canaria. However, this base is being closed, and the likely increase in building and development in the area could be disastrous for this species (2) (5) (7). A further potential threat may come from the spread of introduced snails, which are believed to compete with the endemic snail species, potentially displacing them from some areas (4). Predation by rats, mice and lizards may also be a problem (3).