Neoscolecithrix farrani Smirnov 1935

White Sea, Spitzbergen waters, Norwegian coast, Baffin Bay, Barents Sea, Laptev Sea

Epibenthic/hyperbenthic

Female:
The head and first thoracic segment are fused. A1 is 24-segmented, and is slightly longer than the bigger spine of the last thoracic segment. Rostrum short and bifaurcate, carries 2 long filaments. The 2nd to 4th horacic segments have finely serrated posterior margins on the sides of the dorsal half. Caudal rami bear 6 setae each, 2 of which are very small. P5 small and 3-segmented, carries numerous spines, particularly along its outer margin. Usually carries 4 terminal spines, although Smirnov (1935) found some specimens from the White Sea with only 3 terminal spines.

Male:
Right A1 is 23-segmented, the left is 24-segmented. The mouthparts are fully developed, the first four swimming legs are the same as those of the female. P5 almost symmetrical in length, with a rudimentary endopod
present in at least one of the appendages. Right P5 styliform, 4-segmented and a little shorter than the left one; the last two segments each bear a small outer spine on the proximal halves of the segments. The left leg carries several spines along most of its outer margin.

Female: 1,75-2,37 mm
Male: 1,75-2,20 mm

In Ullsfjord in Norway is second in abundance after Calanus and is found in stomach contents of young cod. Probably plays an important role in the deep water ecosystem.