Carapace slightly broader than long, narrowing posteriorly, strongly convex transversely, dorsal surface smooth, margins setose. Orbits and eyes very small. Anterio-lateral margins of carapace with three to four indistinct teeth. Chelipeds equal, slightly compressed. Second to fifth pereiopods compressed and setose. Chelipeds of male more robust than those of female; male genital openings coxal.
Carapace length up to 20 (22) mm.
Depth range from low water to about 45 metres. Burrowing into sandy bottoms. Larvae June-October.
Carapace pale pink with red or brown markings.
Moray Firth, Plymouth, Channel Isles, Scilly Isles, Cardigan Bay, Anglesey, Liverpool Bay, Isles of Man, Galway Bay.