Mosaic Chrysalis-snail

The Mosaic Chrysalis-snail (Leiostyla tesselata) is a minute land snail belonging to the family Lauriidae, recognisable by its small, elongated, barrel-shaped shell marked with a distinctive tessellated or mosaic-like sculpturing pattern on its surface. This diminutive mollusc, typically only a few millimetres in length, is endemic to Madeira, a Portuguese archipelago in the North Atlantic renowned for its high concentration of endemic land snail species shaped by isolated volcanic island evolution. It inhabits humid microhabitats within laurel forest (laurisilva) remnants and rocky, calcareous terrain, sheltering among leaf litter, damp crevices, and beneath stones and vegetation where moisture is retained.

The species is currently classified as Critically Endangered (CR) on the IUCN Red List, with its population trend recorded as decreasing. Its restricted range and dependence on fragile, moisture-dependent habitat make it acutely vulnerable to ongoing environmental pressures affecting Madeira's remaining native forest patches. Conservation attention for Madeiran endemic snails has grown in recent decades, with habitat protection measures within designated nature reserves and Natura 2000 sites offering a measure of refuge for surviving populations, and renewed scientific interest in the island's invertebrate fauna is helping to close long-standing knowledge gaps.

Continued monitoring and habitat restoration efforts in Madeira's laurisilva zones represent a genuinely hopeful sign for this and other range-restricted snail species, even as their long-term survival remains precarious. Public and institutional support for laurel forest conservation, partly driven by the forest's UNESCO World Heritage status, provides an encouraging foundation for safeguarding the fragile ecosystems this species depends on.

This endemic land snail inhabits the native laurel forests (laurisilva) of Madeira, requiring humid microhabitats with dense vegetation cover. It is typically found in leaf litter and among moss-covered rocks in shaded forest areas at mid-elevations.