Thysanoessa longipes Brandt 1851

A Pacific krill expatriated into the Arctic

Subarctic Pacific in shelf-break habitats deeper than 200 m, amd some some isolated deep fjords; Transposted into the Chukchi Sea by currents; Undergo limited diel vertical migrations, spending daytime near bottom or typically 150-300 m (500 m maximum), night-time shallower

Primarily predatory on smaller zooplankton, but can consume algae when abundant; Prey item for fish, birds, seals and whales

Transparent, yellowish if rich in lipids, females might develop blue hue when spawning; Eyes bi-lobed, rostrum pointed, photophores red; Anntennae lack lappet, carapace with denticle; Abdominal segments 3-6 terminate dorsally with spines; 6th abdominal segment shorter than the two preceding segments combined; second pair of thorathic legs elongated, but often broken during collection

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 2-3 years

depth in m: 140-280; horizontal distribution: boreal to subarctic N Pacific