Overview

Comprehensive Description

Biology

An subarctic Atlantic krill, maringally present in the Arctic
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Transparent, yellowish if rich in lipids, females might develop blue hue when spawning; Eyes bi-lobed, rostrum pointed, photophores red; Anntennae lack lappet, carapace without denticle; Abdominal segments without spines on keel; 6th abdominal segment equal to the two preceding segments combined; second pair of thorathic legs elongated, but often broken during collection
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Distribution

depth in m: 0-400; horizontal distribution: N Atlantic, 35-70°N,
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Source: World Register of Marine Species

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Arctic to Gulf of Maine
  • North-West Atlantic Ocean species (NWARMS)
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Source: World Register of Marine Species

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Boreal species. Found in the Barents Sea, Kara Sea, Laptev Sea, Arctic Basin.

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Physical Description

Morphology

The seconds pair of thoracopods is elongate; the last 2 segments are densely covered with setae. The length of the last abdominal segment is equal in length to the combined length of the previous 2. The endopodites of the uropods are longer than the exopodites and reach the end of the telson.

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Size

Length up to 12 mm.

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Ecology

Habitat

upper and glacial epipelagic regions of the Gulf and estuary, and the upper Mesopelagic of the Gulf and estuary
  • North-West Atlantic Ocean species (NWARMS)
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Depth range based on 404 specimens in 1 taxon.
Water temperature and chemistry ranges based on 380 samples.

Environmental ranges
  Depth range (m): 0 - 4267.5
  Temperature range (°C): -0.896 - 12.863
  Nitrate (umol/L): 0.897 - 22.796
  Salinity (PPS): 33.034 - 35.725
  Oxygen (ml/l): 3.584 - 7.918
  Phosphate (umol/l): 0.222 - 1.567
  Silicate (umol/l): 2.068 - 43.966

Graphical representation

Depth range (m): 0 - 4267.5

Temperature range (°C): -0.896 - 12.863

Nitrate (umol/L): 0.897 - 22.796

Salinity (PPS): 33.034 - 35.725

Oxygen (ml/l): 3.584 - 7.918

Phosphate (umol/l): 0.222 - 1.567

Silicate (umol/l): 2.068 - 43.966
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Subarctic Atlantic in shelf-break habitats deeper than 200 m, amd some some isolated deep fjords; Transposted into the Chukchi Sea by currents; Undergo diel vertical migrations, spending daytime near bottom or typically 200-400 m , night-time 0-100 m
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Trophic Strategy

Primarily predatory on smaller zooplankton, but can consume algae when abundant; Prey item for fish and birds
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Life History and Behavior

Life Cycle

Females lay several clutches of eggs during spring; Females require repeated mating after each molt to form new egg clutches; Life cycles is typcial: eggs, nauplius, metanauplius, followed by several stages of feeding calytopsis, and furcillia larvae; Juveniles resemble adults, and molt regularly while growing to adulthood over the first year of life; Life expectancy not known, likely 1-2 years
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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Thysanoessa longicaudata

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

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