Tandonia sowerbyi (Férussac1823)
Medium to large slug – extended length 6 – 7.5 cm. Body pale brownish-grey speckled with black, with grooves between tubercles also pigmented. Pneumostome with pale orange rim. Keel lighter than body, usually yellow or orange, crinkled when animal is contracted, not truncate. Sole whitish, mucus thick, yellowish and sticky. Some colour variants occur, and the keel is occasionally the same colour as the body.
Gardens, hedges and agricultural land. Tends to be subterranean, and is a notable pest.