- Thysanoessa raschii
Taxobox | name = "Thysanoessa raschii"
regnum =Animal ia
phylum =Arthropod a
subphylum = Crustacea
classis =Malacostraca
ordo = Euphausiacea
familia =Euphausiidae
genus = "Thysanoessa "
species = "T. raschii"
binomial = "Thysanoessa raschii"
binomial_authority = M. Sars, 1864
synonyms ="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 mm long, and are sexually mature above 14 mm [cite web |url=http://ip30.eti.uva.nl/bis/crustacea.php?menuentry=soorten&selected=beschrijving&id=13 |title=Macrobenthos of the North Sea |author=De Kluijver, M. J. & S. S. Ingalsuo] ."T. raschii" is a major prey item of several taxa, including
seabird s, planktivorous fishes andmarine mammal s. OnSt. Lawrence Island ,Alaska , it is the primary constituent of the nestling diet ofCrested Auklet s ("Aethia cristatella"), making up about 66% of their diet by biomass between 2000 and 2004. It is also a common prey item ofshearwater s [cite journal |author=Lovvorn, J. R., C. L. Baduini, & G. L. Hunt |year=2001 |title=Modelling underwater visual and filter feeding by plantivorous shearwaters in unusual sea conditions |journal=Ecology |volume=82 |issue=8 |pages=2342–2356 |url=http://www.esajournals.org/esaonline/?request=get-abstract&issn=0012-9658&volume=082&issue=08&page=2342 |doi=10.1890/0012-9658(2001)082 [2342:MUVAFF] 2.0.CO;2 |doilabel=10.1890/0012-9658(2001)082[2342:MUVAFF]2.0.CO;2] and several species ofgull ."T. raschii" goes through a number of stages in its development. Macdonald defined the characteristics of fourteen stages, or 'furcilia' [cite journal |quotes=no |author=Macdonald, R. |year=1928 |title=The life history of "Thysanoessa raschii" |journal=
Journal of the Marine Biological Association of the United Kingdom |volume=15 |issue=1 |pages=57–80 |url=http://sabella.mba.ac.uk/571/] .References
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