Spirorbis sp.
Originator: Stein Mortensen
Systematics :
Kingdom: Animals (Animalia)
Phylum: Annelid worms (Annelida)
Class: Polychaeta
Order: Sabellida
Family: Spirorbidae
Genus: Spirorbis
Species (sp.): Spirorbis sp.
Norwegian name: Posthornmark
Confusion species: Hydroides norvegicus, Pomatoceros triqueter