Overview

Distribution

Arctic Seas and Central Polar Basin. In the western part of the Atlantic Ocean it moves with cold waters south up to the Gulf of Maine, while in the eastern part individuals were found in the Bay of Biscay but only at a depth of a few hundred meters. It does not penetrate farther south than the Bering Strait and is not found in the Pacific Ocean. [Boeck, 1870]
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© Dunn , Adam

Source: Pelagic Invertebrates LifeDesk

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Gulf of St. Lawrence (unspecified region), Southern Gaspe waters (Baie des Chaleurs, Gaspe Bay to American, Orphan and Bradelle banks; eastern boundary: Eastern Bradelle Valley), Downstream part of Middle St. Lawrence Estuary, Magdalen Islands (from Eastern Bradelle valley to the west, as far as Cape North, including the Cape Breton Channel), Upper Laurentian Channel (bathyal zone off Sept- Iles), Middle North Shore (from Sept- Iles to Cape Whittle, including the Mingan Islands), Laurentian Channel (bathyal zone)(=Honguedo Strait), Lower North Shore, Laurentian Channel (bathyal zone) to the northeast of Anticosti Island (=Jacques Cartier Strait), Laurentian Channel (bathyal zone)(=Esquiman Channel), North and south slope of Anticosti Island, Lower Laurentian Channel (bathyal zone as far as Cabot Strait: Cape North, N.S., St. Paul Island to Cape Ray, NL.), and the Western slope of Newfoundland, including the southern part of the Strait of Belle Isle but excluding the upper 50m in the area southwest of Newfoundland
  • North-West Atlantic Ocean species (NWARMS)
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© WoRMS for SMEBD

Source: World Register of Marine Species

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Physical Description

Diagnostic Description

The head is equal in length to the first two somites of the pereon. In antennae I the peduncle is three segmented and short; the flagellum in females is just barely longer than the head, narrowly conical, and not distinctly divided into segments; in sexually mature males the flagellum consists of 13-15 segments and extends to the end of the pereon. The mandibles have a narrow denticulate cutting edge and an accessory plate is present in the left mandible; the dentate process is strong and broad; the 2nd segment of the thin palp is approximately twice longer than the 1st and 1.5 times the 3rd segment. The outer lobe of maxillae I bears a row of setae in addition to two strong apical spines and the palp is broader than long. The outer lobe of maxillae II is narrow and apically armed with two spines; the much broader inner lobe bears only only apical spine. The outer lobes of the maxillipeds are narrow, sickle-shaped, and unarmed along the convex outer margin; the inner lobes form a plate with a straight or concave distal margin; the basal plate is unarmed. The 6th segment of pereopods I is shorter than the 5th and its posterior margin very finely denticulate with a few submarginal short setae; the claw bears a group of short setae in the proximal part of the inner margin. Pereopods II are somewhat longer than pereopods I; the 5th segment has a spoon-shaped process extending to 2/3 the length of the 6th segment and apically bearing a few long setae; the 6th segment has a finely denticulate posterior margin; the claw is straight and smooth. In pereopods III and IV the 4th segment is identical in structure and slightly broadens distally; it is 1/2-2/3 the length of the narrowly oval, almost linear 5th segment; the 6th segment of pereopods III is 1.2-1.5 times longer than the 5th but in pereopods IV almost equal to the 5th segment; the claws are long and smooth. Pereopods V-VII are similar in structure and almost equal in length; the 4th segment is approximately half the length of the linear 5th segment, which in turn is about 2/3 the length of the much thinner 6th segment; the claws are thin, almost straight and smooth, and 2/7-2/5 the length of the 6th segment. The anterior margin of the 5th and 6th segments of pereopods V is smooth while in pereopods VI and VII it is pubescent with short and tender setae. The basipodites of all the uropods are considerably longer than the rami; the outer margin of the rami is smooth and the inner margin finely denticulate. The oval-triangular telson has an acute apex, is 1/3 the length of the basipodite of uropods III, and slightly longer than its own width at the base. The life cycle covers two years; the crustacean dies after reproduction. The period of reproduction is protracted and probably stretches from February to August. [Boeck, 1870]
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© Dunn , Adam

Source: Pelagic Invertebrates LifeDesk

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Ecology

Habitat

upper and glacial epipelagic regions of the Gulf and estuary
  • North-West Atlantic Ocean species (NWARMS)
Creative Commons Attribution 3.0 (CC BY 3.0)

© WoRMS for SMEBD

Source: World Register of Marine Species

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Depth range based on 369 specimens in 1 taxon.
Water temperature and chemistry ranges based on 250 samples.

Environmental ranges
  Depth range (m): 0 - 1903.05
  Temperature range (°C): -1.759 - 18.062
  Nitrate (umol/L): 0.367 - 29.725
  Salinity (PPS): 25.752 - 35.437
  Oxygen (ml/l): 5.585 - 9.319
  Phosphate (umol/l): 0.055 - 1.982
  Silicate (umol/l): 2.214 - 64.372

Graphical representation

Depth range (m): 0 - 1903.05

Temperature range (°C): -1.759 - 18.062

Nitrate (umol/L): 0.367 - 29.725

Salinity (PPS): 25.752 - 35.437

Oxygen (ml/l): 5.585 - 9.319

Phosphate (umol/l): 0.055 - 1.982

Silicate (umol/l): 2.214 - 64.372
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Dispersal

It mainly lives in the upper 100 m layer. [Boeck, 1870]
Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© Dunn , Adam

Source: Pelagic Invertebrates LifeDesk

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