Onchidoris tschuktschica

Onchidoris tschuktschica
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
(unranked):	clade Heterobranchia ; clade Euthyneura ; clade Nudipleura ; clade Nudibranchia ; clade Euctenidiacea ; clade Doridacea
Superfamily:	Onchidoridoidea
Family:	Onchidorididae
Genus:	Onchidoris
Species:	O. tschuktschica
Binomial name
	Onchidoris tschuktschica; Krause, 1885 [1]
Synonyms [2]
	Adalaria tschuctschicaKrause, 1885 (misspelling) ; Arctadalaria septentrionalisRoginskaya, 1971 ;

Last updated April 29, 2019

Onchidoris tschuktschica is a species of sea slug, a dorid nudibranch, a shell-less marine gastropod mollusc in the family Onchidorididae.^[2]

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 sexes or mating types can produce fertile offspring, typically by sexual reproduction. Other ways of defining species include their karyotype, DNA sequence, morphology, behaviour or ecological niche. In addition, paleontologists use the concept of the chronospecies since fossil reproduction cannot be examined. While these definitions may seem adequate, when looked at more closely they represent problematic species concepts. For example, the boundaries between closely related species become unclear with hybridisation, in a species complex of hundreds of similar microspecies, and in a ring species. Also, among organisms that reproduce only asexually, the concept of a reproductive species breaks down, and each clone is potentially a microspecies.

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 actually gastropods, i.e. they are sea snails that over evolutionary time have either completely lost their shells, or have seemingly lost their shells due to having a greatly reduced or internal shell. The name "sea slug" is most often applied to nudibranchs, as well as to a paraphyletic set of other marine gastropods without obvious shells.

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, such as "clown", "marigold", "splendid", "dancer", and "dragon". Currently, about 3,000 valid species of nudibranchs are known.

Distribution

This species was described from Metschigman Bay on the Chukchi Peninsula, Bering Sea, on the Pacific Ocean coast of Russia.

The Chukchi Peninsula, at about 66° N 172° W, is the easternmost peninsula of Asia. Its eastern end is at Cape Dezhnev near the village of Uelen. It is bordered by the Chukchi Sea to the north, the Bering Sea to the south, and the Bering Strait to the east. The peninsula is part of Chukotka Autonomous Okrug of Russia. The peninsula is traditionally the home of tribes of the indigenous peoples of Siberia as well as some Russian settlers.

Bering Sea Marginal sea of the Pacific Ocean off the coast of Alaska, Eastern Russia and the Aleutian Islands

The Bering Sea is a marginal sea of the Pacific Ocean. It comprises a deep water basin, which then rises through a narrow slope into the shallower water above the continental shelves.

The Pacific Ocean is the largest and deepest of Earth's oceanic divisions. It extends from the Arctic Ocean in the north to the Southern Ocean in the south and is bounded by Asia and Australia in the west and the Americas in the east.

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References

↑ Krause, A. (1885). Ein Beitrag zur kenntnis der Molluskenfauna des Beringsmeres. II. Gastropods und Pteropoda. Archiv für Naturgeschichte. 51(1): 256-302, pls 16-18, page 296, Tab. XVII, fig 5.
1 2 Bouchet, P. (2015). Onchidoris tschuktschica (Krause, 1885). In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2016-01-23.

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[1] Krause, A. (1885). Ein Beitrag zur kenntnis der Molluskenfauna des Beringsmeres. II. Gastropods und Pteropoda. Archiv für Naturgeschichte. 51(1): 256-302, pls 16-18, page 296, Tab. XVII, fig 5.

[WoRMS-2] 1 2 Bouchet, P. (2015). Onchidoris tschuktschica (Krause, 1885). In: MolluscaBase (2015). Accessed through: World Register of Marine Species on 2016-01-23.