Arion flagellus

Arion flagellus, also known by its common name (in the United Kingdom) the Durham slug, is a species of air-breathing land slug, a terrestrial pulmonate gastropod mollusc in the family Arionidae, the roundback slugs.

Distribution
This species is native to the northern part of the Iberian peninsula, but has been introduced in various countries and islands including:
 * Great Britain
 * Ireland
 * the Netherlands
 * Canada