Tortanus (Boreotortanus) discaudatus

Taxon-Order: 

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Distribution: 
Local waters; Chukchi Sea, Bering Strait, Sea of Japan, Sea of Okhotsk, North Sea, the Atlantic coast of North America.
Habitat: 
Neritic.
Size: 
Female 1.4-2.8mm; male 1.3-2.5 mm
Diet: 
Carnivorous as adults; copepod larvae and other, smaller copepods.
Predators: 
Fish and others.
Useful Facts or Characters: 

Caudal rami asymmetrical, body elongate, urosome long and asymmetrical.  In females, posterior corners of 5th segment end in a curved, pointed process; in males, the corners are rounded.

Natural History: 

Distinctive asymmetrical cadual rami (tip of the tail region).

References: 

http://www.marinespecies.org/copepoda/aphia.php?p=taxdetails&id=720592

http://copepodes.obs-banyuls.fr/en/fichesp.php?sp=1753

Johnson, M.W. (1934) The life history of the copepod Tortanus discaudata (Thompson and Scott). Biological Bulletin 47: 181-200.