description Balea perversa (tree door snail) Overview
Balea perversa, known as the tree snail or tree door snail, is a small terrestrial pulmonate gastropod in the family Clausiliidae. It is native to western and central Europe and has a narrow, brownish shell that coils to the left, an uncommon shell direction among land snails. The species is associated with damp or sheltered surfaces such as tree trunks, walls, rocks, and similar cover, and its shell can retain a juvenile-like appearance compared with many other door snails. [Northern Ireland species account](https://www.habitas.org.uk/priority/species.asp?item=6745)
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