The first segment of the stalk of the antennules carries a large lobar process, which nearly reaches the eyes. The carapace is armed with a spine behind each eye; the lateral corners of the carapace are transformed into short sharp points. The endopodite of the uropods is very narrow, almost the same length as the telson. The exopodite is somewhat longer and almost 2 times wider than the endopodite. The lobar processes on the endopodites of the pleopods of males have a characteristic shape (shown on figure).

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Length up to 50 mm.

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Boreal Atlantic species; can be carried into Arctic waters, but does not reproduce there.

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