A1 equal to the length of the cephalothorax. Serratures of apical spines of exopodites of swimming legs very dense, sharp, without intervals.
Bipolar species. Occurs in the Arctic Basin, Greenland Sea, Norwegian Sea, Malay Peninsula
Oceanic, bathypelagic species. Occurs at depths of 1000-2000 in the Greenland Sea, 100-1400 in the Central Arctic
Female: Forehead widens dorsally, creating a broadly triangular shape of the head. Rostrum highly chitinized, it consists of 2 acutely pointed branches which are shorter than the base of the rostrum. Head and 1st thoracic segment fused, 4th and 5th separate (the indication of a line of fusion is visible in lateral aspect on the back). Proportional lengths of cephalothorax and abdomen have the ratio 16 :5. Body with a thick, well chitinized carapace with a characteristic pitted structure on the thorax. A1 equal to the length of the body. Serratures of apical spines of exopodites of swimming legs very dense, sharp, without intervals. Spines of the last segment of the cephalothorax are shifted to the back of the body and reach the middle of the genital segment. Abdomen 4-segmented ; 3.5 times shorter than the cephalothorax. Genital segment is slightly shorter in length than the next two segments combined. Genital field symmetrical; genital flap not seen and no trace of receptacles. The 1st-3rd abdominal segments with finely serrated lamellae along their distal border. Anal segment small, with a distinct anal operculum. Caudal rami 1.5 times longer than wide and parallel to each other; each ramus with 4 marginal plumose setae, plus 1 external seta, short, fine and plumose ; internal margin of rami with fine, long hairs.
Male: unknown
Produce very fragile and adhesive egg-sacs filled with 7-12 light orange eggs
Females: 2.56-3.90 mm
Omnivorous species; mainly feed phytoplankton and/or phytodetritus, but may also consume microzooplankton and copepod juveniles
