Submedian lobes of carapace shallow or poorly developed. Antero-lateral margins of carapace with five strongly curved teeth, alternating slightly in size, first and second often lobate, length of fifth at least twice the width. Chelipeds unequal in size; second to fourth pereiopods thin and moderately compressed, third shorter than fourth; carpus-dactylus of second to fourth with longitudinal carinae, dactylus styliform; propodus and dactylus of fifth moderately broad, dactylus lanceolate.
Carapace length up to 24 (34) mm.
Depth range from 28 to 91 metres. Ovigerous May-July.
Carapace brilliant reddish brown, sometimes with dark blotches (Bate, 1851).
East Channel, Channel Isles, Plymouth, Scilly Isles, Bristol Channel.