- Kingdom: Animalia
- Phylum: Annelida
- Class: Polychaeta
- Subclass: Canalipalpata
- Order: Sabellida
- Family: Serpulidae
- Scientific name: Filograna implexa
- Norwegian: filigranmark
The coral worm itself is hard to spot, as its length rarely exceeds 4 mm. The bushy, white colony, however, is easily identified. The bush is a popular hideout for other small animals searching for food brought by the current. The worm has eight tentacles and approximately 30 segments.
It thrives on rocky substrate, often on current exposed locations. It is most frequent deeper than 20 metres.
This worm is a real cosmopolitan, and is well known in most oceans. In Norway it is registered along the entire coast as far north as the North Cape, the northernmost point of Norway.