Thysanoessa raschii

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Thysanoessa raschii
Thysanoessa raschii.jpg
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Crustacea
Class: Malacostraca
Order: Euphausiacea
Family: Euphausiidae
Genus: Thysanoessa
Species: T. raschii
Binomial name
Thysanoessa raschii
M. Sars, 1864

Rhoda jardineana Sim, 1872
Euphausia raschii G. O. Sars, 1883
Boreophausia raschii Norman, 1886
Rhoda raschii Stebbing, 1893

Thysanoessa raschii, sometimes known as Arctic krill, is one of the most common euphausiid species of the subarctic and Arctic seas. They may reach 20–25 millimetres (0.8–1.0 in) long, and are sexually mature above 14 mm (0.6 in).[1]

T. raschii is a major prey item of several taxa, planktivorous fishes and marine mammals. It is also a common prey item of seabirds, including shearwaters.[2]

This species goes through a number of stages in its development. Roderick Macdonald defined the characteristics of fourteen stages, or 'furcilia'.[3]


  1. ^ M. J. de Kluijver & S. S. Ingalsuo. "Thysanoessa raschii". Macrobenthos of the North Sea. Universiteit van Amsterdam. Retrieved December 7, 2006. 
  2. ^ J. R. Lovvorn; C. L. Baduini & G. L. Hunt (2001). "Modelling underwater visual and filter feeding by planktivorous shearwaters in unusual sea conditions". Ecology. 82 (8): 2342–2356. ISSN 0012-9658. doi:10.1890/0012-9658(2001)082[2342:MUVAFF]2.0.CO;2. 
  3. ^ R. Macdonald (1928). "The life history of Thysanoessa raschii". Journal of the Marine Biological Association of the United Kingdom. 15 (1): 57–80. doi:10.1017/S0025315400055533.