May 9th, 2008
The Celtic sea slug (Onchidella celtica) has been sighted on a rocky outcrop at St. Martins Point, Guernsey. Onchidella celtica is a small oval slug with a fleshy body or mantle that is dark green to black in colour and is covered in tubercles. It is about 12mm in length and 6mm in width. When motionless, the mantle covers the head and the foot. The head is only visible when the slug is mobile.
Added by Rachelle Long