''Tjaernoeia'' is a genus of

sea snail Sea snails are slow-moving marine (ocean), marine gastropod Mollusca, molluscs, usually with visible external shells, such as whelk or abalone. They share the Taxonomic classification, taxonomic class Gastropoda with slugs, which are distinguishe ...

s, marine

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant species of molluscs are recognized, making it the second-largest animal phylum after Arthropoda. The ...

s in the informal group

Lower Heterobranchia Lower Heterobranchia, also known as the Allogastropoda, is a group of rather specialized, highly evolved sea slugs and sea snails, marine (ocean), marine gastropod mollusc, mollusks within the Subclass (biology), subclass Heterobranchia.WoRMS (20 ...

. They are named after the marine laboratory at Tjärnö, Strömstad,

Sweden Sweden, formally the Kingdom of Sweden, is a Nordic countries, Nordic country located on the Scandinavian Peninsula in Northern Europe. It borders Norway to the west and north, and Finland to the east. At , Sweden is the largest Nordic count ...

. Their shells are rounded, thin and translucent. There are four species of ''Tjaernoeia''. Two of them are found in the

Bohuslän Bohuslän () is a Provinces of Sweden, Swedish province in Götaland, on the northernmost part of the country's west coast. It is bordered by Dalsland to the northeast, Västergötland to the southeast, the Skagerrak arm of the North Sea to the ...

region of Sweden: Tjaernoeia exquisita and Tjaernoeia unisulcata. ''Tjaernoeia'' is the only genus in the family Tjaernoeiidae.

Species

Species in the genus ''Tjaernoeia'' include: * '' Tjaernoeia boucheti'' Warén, 1991 - from deep water in the northeastern Atlantic It has a smooth or almost smooth protoconch. * '' Tjaernoeia exquisita'' (Jeffreys, 1883) - described from

Crete Crete ( ; , Modern Greek, Modern: , Ancient Greek, Ancient: ) is the largest and most populous of the Greek islands, the List of islands by area, 88th largest island in the world and the List of islands in the Mediterranean#By area, fifth la ...

, also known from

Ghana Ghana, officially the Republic of Ghana, is a country in West Africa. It is situated along the Gulf of Guinea and the Atlantic Ocean to the south, and shares borders with Côte d’Ivoire to the west, Burkina Faso to the north, and Togo to t ...

* '' Tjaernoeia michaeli'' Engl, 2002 * '' Tjaernoeia unisulcata'' (Chaster, 1897)Gofas, S. (2010). ''Tjaernoeia unisulcata'' (Chaster, 1897). In: Bouchet, P.; Gofas, S.; Rosenberg, G. (2010) World Marine Mollusca database. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=141685 on 2011-01-20

References

{{Taxonbar, from=Q16993138