• Norwegian: -


Very similar to F. nobilis, but can be distinguished from this by the two white lines running along the body, below the cerata. A white line runs along each of the two tentacles and join to form a single line on the top of its back. The body color is translucent white, while the cerata are often yellow, orange, red or brown. The body length may reach 4 cm.


It is often seen feeding on hydroids below the tidal zone. It can be found on any depth, down to 400 meters.


It is registered in the western Mediterranean and the Atlantic coasts of Europe, as far north as Norway.