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(Lilljeborg, 1855)

Carapace as broad as long, smooth in the female or with some minute denticles or more usually with a pair of small teeth one behind the other on either side of the frontal lobe; in the male the lateral line runs near to the lower margin from the subrostral angle to the rear of the carapace. The pseudorostrum is not very long. The postero-lateral corners of pereionite 5 are rounded in the female, produced to an acute point in the male. The eye is prominent, with lenses. Basis of pereiopod 1 with a row of spines, shorter than remaining segments together; the carpus is shorter than the propodus, which is about twice as long as the dactyl. The carpus of pereiopod 2 is nearly as long as the propodus and dactyl together. The telson is shorter than the uropod peduncles and has eight or nine pairs of lateral spines; its distal part is about as long as or a little shorter than the proximal part.
Telson long, postanal part narrowed, with several pairs of lateral spines.

Up to 10 mm.

Shelf to bathyal.

Depth range:
Down to about 25 and 1400 metres.

Distribution in the North Sea:
Northern North Sea, Skagerrak.

World distribution:
Has been collected between N Norway and the Bay of Biscay and from the Azores, including a few records from NE England, the Clyde area and Liverpool Bay off the British Isles.

Diastylis tumida