Rostrum straight or very slightly down turned, about half the length of carapace and slightly longer than antennular peduncle; five to ten dorsal teeth (usually seven or eight), one ventral tooth (rarely two or three).
Carapace with antennal spine.
Stylocerite narrow, acutely pointed, 0.66 x length of antennular peduncle or slightly less.
Scaphocerite outer border straight or slightly concave, apex acutely rounded with apical spine not exceeding lamellar portion. Antennal flagellum about 0.75 x length of body. Third maxilliped longer than scaphocerite by as much as last two joints; epipod and exopod present.
Mandible with molar and incisor process, and three-segmented palp.
Carpus of pereiopod 2 two- segmented, chelae long and slender. Pereiopods 1-4 with epipods, pereiopod 5 with reduced setobranch. Pleonite 4 usually without ventro-posterior tooth in female.
Telson with two pairs of lateral spines.
Length up to 27 mm.
Carapace and pleon scattered with red chromatophores, darkest on rostrum, otherwise virtually transparent.
Down to 10-1,000 metres, usually 20-500 metres. Normally found on rocky, sandy or gravelly substrata. Adults may swim up into the water column. Ovigerous females occur from March to October.
Distribution in the North Sea:
All North Sea.
Ranges from Iceland and Norway southwards into the Bay of Biscay. In the W Atlantic, this species is known from Newfoundland to Chesapeake Bay.