- Kingdom: Animalia
- Phylum: Cnidaria
- Class: Hydrozoa
- Subclass: Hydroidolina
- Order: Anthoathecata
- Suborder: Aplanulata
- Family: Corymorphidae
- Scientific name: Corymorpha nutans
- Norwegian: -
Hydroid stage: The stem is quite thick and partly transparent with fine longitudinal lines. The large, light red polyp has 30-40 long, thin tentacles, surrounding approximately 80 shorter ones in the center of the polyp. It can grow to a length of 15 cm. It can hardly be confused with any other species.
Medusa stage: The bell-shaped umbrella is nearly twice as high as broad. The maximum height is 6 mm. It has four radial canals and a ring canal. It has a single, stout tentacle.
The hydroid is usually found on sand or gravel, on depths between 5 and 25 meters.
It is common along all coasts surrounding the North Sea. In Norway it can be found as far north as the North Cape (Nordkapp).