Tree Slug (Lehmannia marginata)

Tree Slug (Lehmannia marginata)

Observation - Tree Slug (Lehmannia marginata) - UK and Ireland. Description: Found crossing a boulder (possibly grazing the lichens?) after a night of rain. A very clear pale keel from mantle to tail.

Found crossing a boulder (possibly grazing the lichens?) after a night of rain. A very clear pale keel from mantle to tail.
Edit: Changed to match Christian Owen's ID. Many thanks.