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Boeck, 1871

Description:
Body quite slender; urosome segment 1 in male with a setose lobe on the dorsal margin; pereion segments 5 to 7 and pleon segments 1 to 3 each with a small group of long, fine setae on the dorsal margin; number of setae variable. Epimeral plate 3 posterodistal angle with a minute tooth. Corneal lenses absent, only two small patches of reddish pigment in fresh material. Antenna 1 slightly more than half the body length, peduncle article 2 much longer and more slender than article 1, flagellum about 25-articulate, in female only with long setae; female antenna 2 equal in length to antenna 1, flagellum setose; male antenna 2 much longer than antenna 1, flagellum filiform. Gnathopods 1 and 2 slender and setose, weakly subchelate, propodus oval and much shorter than the carpus. Pereiopods 3 and 4 merus elongate and fringed with plumose setae, dactylus little longer than the propodus. Pereiopods 5 and 6 carpus robust with few marginal spines and a very long distal spine, propodus long and slender, dactylus large and strongly curved. Basis of pereiopod 7 broad, posterior margin about straight, distal margin broadly rounded; ischium, merus and carpus flattened and weakly spinose, propodus slender and only little shorter than the carpus, dactylus very small. Uropod 3 with plumose setae, inner ramus with 2 to 4 spines on the inner margin. Telson narrowly rounded, cleft to the mid-point, with several long setules.

Size:
Up to 15 mm, occasionally over 20 mm.

Colour:
Greyish white.

Habitat:
Deep water, from 70 to 3000 metres.

Distribution:
Arctic Ocean, North Atlantic, American and European coasts, widespread and frequently recorded; southern limit around the Scottish coasts and the Skagerrak.

Haploops setosa