Published: 03.06.2020 Updated: 04.06.2020
Most of today's cephalopod species have a soft body with no outer hard parts, but an inner shell that stiffens the body and regulates buoyancy.
The Greek word "Cephalopoda" means head-feet and refers to the feet or arms sitting directly on the head. There are around 800 species in the world, and it is an exclusively marine group. Species diversity is highest around the equator and decreases towards the poles. We can distinguish between eight- and ten-armed cephalopods. The ten-armed ones have two tentacles in addition to the eight arms, and these are often longer and thinner than the arms.
In Norwegian waters, we find about 25 species, some of which are very rare and verified by only one or a few individuals. They can be divided into four main groups:
Many species have commercial value and are exploited as food in other parts of the world.