Very transparent copepod with a light blue tint

A common surface-dwelling copepod of the subarctic Pacific

Transparent, dark grey if eggs present

Amundsen Basin, Canadian Exclusive Economic Zone [Pacific part], Chukchi Sea, FAO fishing area 18, FAO fishing area 67, Gulf of Maine, Gulf of St. Lawrence, Hudson Bay, Hudson Strait, Nansen Basin, North East Pacific, North Pacific, St. Lawrence Estuary, Storfjordrenna, Storfjords

Very common species, found in all of northern Atlantic and Pacific and in northern seas, Arctic basin

Female: Body elongate, slender. No rostrum. Corners of 5th thoracic segment rounded, but each one carries a relatively long and sharp spine on the back side of the body. Genital segment is slightly swollen and carries a set of tiny spines on the back edge. The second segment carries very thin and sharp spines on the back edge. Anal segment is more than two times shorter than the previous one and carries no armature. Caudal rami slightly asymmetrical, the left ramus is larger than the right (rarely reversed). Apical chaeta of P5 lacks setae, is long and narrow, slightly curved, and slightly longer than the pubescent chaeta.

Male: The armature of the last thoracic segment and abdomen identical to that of females. Abdomen contains 5 segments - the second is the longest, the fourth is very short. Right A1 is geniculate. P5 has modified structure: second and third segments of the right leg have dull protrusions facing the inner side, the protrusion on the third segment is armed with a small spine. The fourth segment is elongate and curved. The penultimate segment on the left leg is smooth. The last segment is armed with a spine and a finger-shaped outgrowth that is the same length as the spine.

Female 0,84-1,35mm
Male 0,80-1,15mm

Female: the presence of long and sharp spines on the corners of the 5th thoracic segment. Long and slender apical chaetae on P5.
Male: structure of P5 very similar to that of A. clausi, but armature is less developed and and the penultimate segment lacks a sharp denticulate edge.

Depth range based on 5502 specimens in 1 taxon.
Water temperature and chemistry ranges based on 733 samples.

Environmental ranges
  Depth range (m): 0 - 2382.75
  Temperature range (°C): -1.848 - 22.519
  Nitrate (umol/L): 0.119 - 44.900
  Salinity (PPS): 16.708 - 36.424
  Oxygen (ml/l): 0.651 - 9.192
  Phosphate (umol/l): 0.048 - 3.254
  Silicate (umol/l): 2.171 - 105.771

Graphical representation

Depth range (m): 0 - 2382.75

Temperature range (°C): -1.848 - 22.519

Nitrate (umol/L): 0.119 - 44.900

Salinity (PPS): 16.708 - 36.424

Oxygen (ml/l): 0.651 - 9.192

Phosphate (umol/l): 0.048 - 3.254

Silicate (umol/l): 2.171 - 105.771
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

Neritic species, characteristic for upper layers; estuarine, coastal

Epipelagic (surface waters); Estuarine, coastal; Arctic and Subarctic

Filter-feeder; Micro-carnivore

Female spawns repeatedly; Small eggs scattered into water; Generation time (egg to adult): months; Multiple generations per year; Present spring through late fall; Eggs laid in fall overwinter in sediments and hatch in spring

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 5
Species With Barcodes: 1

Occuring in large numbers in coastal zones, this species can compose a significant part of the diet of fish larvae and planktivirous fish