Body colorless and nearly transparent; light orange pigment may be present in antennae
This species closely resembles E. elongatus but can be distinguished from it by the slender rostral filaments, number of setae on the endopod of the Mx1 and Mx2, and rugged ridges at the bases of the outer marginal spines on the 2nd and 3rd exopodal segments of P1 (See in Tanaka & Omori, 1974)
Central Arctic Basin
Oceanic, abyssal species, found at depths greater than 200m.
Female: Forehead broadly rounded. Bifurcate rostrum with 2 thin relatively long filaments. Abdomen 2.6 times shorter than the cephalothorax. Caudal rami relatively short. A1 extend beyond the body by 2-3 last segments. Branches of A2 almost identical in length. The feeding edge of the Mx with 3 pairs of serrations and one mobile projection. Mandibular palpus biramous. Mx well developed. P1 with full armature of the exopodite, the distal segment holds 2 outer lateral spines. The spine on the first segment extends beyond the base of the spine of the second segment, but does not reach its tip. P5 of simple structure.
Male: Distal cheatae in Mxp 1 and 2 with small fungiform bodies. P1 carries full armature (i.e. the first and second segments of the exopodite carry a single outer spine, the distal segment carries 2). Rostrum with 2 long thin filaments. P5 contains very long chaetae on the second segments of the basipodite. The distal segment of the right P5 carries a large apical spine, and a short apical spine and longer inner spines are present on the left P5.
Produce egg-sacs, often with only 3-4 eggs very large relative to female size
Females: 6.22-7.61 mm
Males: 5.45-6.80 mm
Opprotunistic omnivores
Euaugaptilus hyperboreus is a species of deep-water copepod.[1]
