- Kingdom: Animalia
- Phylum: Annelida
- Class: Polychaeta
- Subclass: Sedentaria
- Order: Sabellida
- Family: Sabellidae
- Scientific name: Sabella pavonina
- Norwegian: påfuglmark
The body may reach 30 cm and include as many as 600 segments. The body is protected by a tube with a diameter of 8 mm or less. The feathery crown comes in wide range of colors. Often there are bands of red or orange. The crown retract quickly into the tube when the worm is disturbed.
It is usually seen on hard surfaces on sandy or rocky locations, it is very common on ship wrecks. It is most frequent deeper than 20 meters.
The peacock worm is widespread in the Atlantic Ocean, on both the northern and southern hemispheres.