Tjaernoeia

Tjaernoeia is a genus of sea snails, marine gastropod mollusks in the informal group Lower Heterobranchia.^[3] They are named after the marine laboratory at Tjärnö, Strömstad, Sweden. Their shells are rounded, thin and translucent.

Tjaernoeia
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Infraclass:	Mesoneura
Superfamily:	Tjaernoeioidea
Family:	Tjaernoeiidae Warén, 1991[1]
Genus:	Tjaernoeia Warén & Bouchet, 1988[2]

There are four species of Tjaernoeia. Two of them are found in the Bohuslän region of Sweden: Tjaernoeia exquisita and Tjaernoeia unisulcata.^[4] Tjaernoeia boucheti can be found in Scandinavia and in Iceland. Tjaernoeia michaeli has been found in Antarctica and Brazil.^[5]

Tjaernoeia is the only genus in the family Tjaernoeiidae.^[6] Their closest relatives are Parvaplustridae.^[7]

Species

Species in the genus Tjaernoeia include:

• Tjaernoeia boucheti Warén, 1991^[8] - from deep water in the northeastern Atlantic^[1] It has a smooth or almost smooth protoconch.
• Tjaernoeia exquisita (Jeffreys, 1883) - described from Crete,^[9] also known from Ghana^[10]
• Tjaernoeia michaeli Engl, 2002^[11]
• Tjaernoeia unisulcata (Chaster, 1897)^[12]