''Polaria polaris'' is a

species In biology, a species is the basic unit of classification and a taxonomic rank of an organism, as well as a unit of biodiversity. A species is often defined as the largest group of organisms in which any two individuals of the appropriate s ...

sea slug Sea slug is a common name for some marine invertebrates with varying levels of resemblance to terrestrial slugs. Most creatures known as sea slugs are gastropods, i.e. they are sea snails (marine gastropod mollusks) that over evolutionary time ...

, an aeolid

nudibranch Nudibranchs () are a group of soft-bodied marine gastropod molluscs which shed their shells after their larval stage. They are noted for their often extraordinary colours and striking forms, and they have been given colourful nicknames to match, ...

, a marine

heterobranch Heterobranchia, the ''heterobranchs'' (meaning "different-gilled snails"), is a taxonomic clade of snails and slugs, which includes marine, aquatic and terrestrial gastropod mollusks. Heterobranchia is one of the main clades of gastropods. Cur ...

mollusc in the family

Paracoryphellidae Paracoryphellidae is a taxonomic family of brightly coloured sea slugs, specifically nudibranchs, marine gastropod mollusk Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda, the members of which are k ...

.Rosenberg, G. (2015)
''Flabellina polaris'' Volodchenko, 1946.
In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2015-11-07

Distribution

This species was described from the

Arctic Ocean The Arctic Ocean is the smallest and shallowest of the world's five major oceans. It spans an area of approximately and is known as the coldest of all the oceans. The International Hydrographic Organization (IHO) recognizes it as an ocean, a ...

Description

''Polaria polaris'' is a flabellinid nudibranch with numerous closely spaced

cerata :''The tortrix moth genus ''Cerata'' is considered a junior synonym of ''Cydia. Cerata, singular ceras, are anatomical structures found externally in nudibranch sea slugs, especially in aeolid nudibranchs, marine opisthobranch gastropod mollusks ...

and extremely long

rhinophore A rhinophore is one of a pair of chemosensory club-shaped, rod-shaped or ear-like structures which are the most prominent part of the external head anatomy in sea slugs, marine gastropod opisthobranch mollusks such as the nudibranchs, sea ha ...

s. The body is translucent white and the digestive gland in the cerata is red. There is a broad band of opaque white pigment at the tip of the cerata. The rhinophores are smooth or slightly wrinkled and the oral tentacles have a splash of white pigment in the outer third.Semenov, A., 2015
''Flabellina polaris''
Flickr, accessed 07-11-2015.

References

{{Taxonbar, from=Q3694972 Paracoryphellidae Gastropods described in 1946