- Kingdom: Animalia
- Phylum: Porifera
- Class: Demospongiae
- Order: Poecilosclerida
- Family: Esperiopsidae
- Scientific name: Amphilectus fucorum
- Norwegian: -
The shape is highly variable. It can produce thin sheets overgrowing any stationary object on the bottom. It may produce lobes or branches or take a cushioned form. It is usually between 2 and 15 mm thick. The color is often vivid yellow or orange. On deeper locations, with limited light exposure the color is usually pale yellow or even grey.
It prefers shallow waters, but otherwise tolerates a wide range of exposures. It seems to thrives on locations with strong tidal currents.
It is common along the Atlantic coast of Europe, from the Mediterranean to Norway (as far north as Troms) and the Faroes.