Frontal region of carapace produced as a broad rostrum with each half widely separated, conspicuously broad at base and tapering distally, postorbital spine laterally expanded, antorbital spine absent, a gap sometimes present between supraorbital eave and postorbital spine, many regions of carapace with boletate and scutellate tubercles, intestinal region with a crescentric row of flat, fused tubercles; second and third peduncular segments of antenna moderately broad, eyestalks concealed when retracted. Chelipeds equal in size; second to fifth pereiopods with segment margins strongly cristate, propodus and dactylus setose.
Female chelipeds shorter and less robust than in male.
Carapace length up to 14 (19) mm.
Depth range from lower shore to beyond 180 metres, hard ground and muddy sand. Ovigerous crabs January-August, larvae March-November.
Carapace and limbs pale red to brown, sometimes blue-grey, tubercles white or brownish.
Shetland, Orkney, Moray Firth, Firth of Forth, Yorkshire, Wash, East Channel, Wight, Portland, Channel Isles, Plymouth, Scilly Isles, Bristol Channel, Anglesey, Liverpool Bay, Isle of Man, Dublin, Belfast, Clyde & Argyll, Lewis, Fastnet, Cork, Sole.