This imaginatively named slug earns its intriguing description for the snake-like texture to its skin, with dark-coloured grooves appearing to divide the skin into scales. The roundish body, which tapers gently towards the head, and more acutely at its rear, has a pale buff upper surface, brown to dark brown sides, and a dark brown, almost black, border between the two. This border may thin and become fragmented in some slugs, particularly when fully extended. The sole (underside) is pale greyish-brown and extensively speckled with small dark spots (2).
- Extended length: up to 55 mm (2)