Subclass: Opisthobranchia

Norwegian name: Bakgjellesnegler

Systematics :

KingdomAnimals (Animalia)
Phylum Molluscs (Mollusca)
Class  Snails (Gastropoda)
Subclass   Opisthobranchia
Order    Gymnosomata
Genus     Clione
Species      Clione limacina
Order    Nudibranchia
Family     Onchidorididae
Genus      Onchidoris
Family     Tergipedidae
Genus      Tergipes
Order    Thecosomata
Genus     Limacina
Species      Limacina retroversa