Sue Daly / Feather duster fan worm (Sabella spallanzanii) with tentacles moving in the current, Sark, British Channel Islands, UK, August.

Claudio Contreras / Social feather duster worm (Bispira brunnea) Cancun national Park, Caribbean Sea, Mexico, July

Pascal Kobeh / Hard coral (Porites lutea) with Christmas-tree worms (Spirobranchus giganteus), New Caledonia, Pacific Ocean.

Georgette Douwma / Kaleidoscopic image of Featherduster worm. Indonesia.

Georgette Douwma / Kaleidoscopic image of Variegated feather duster (Bispira variegata), Sabellidae. Puerto Galera, Philippines.

Georgette Douwma / Kaleidoscopic image of Variegated feather duster (Bispira variegata), Sabellidae. Puerto Galera, Philippines.

Georgette Douwma / Kaleidoscopic image of Indian fan worm (Sabellastarte indica), Mabul, Malaysia.

Georgette Douwma / Kaleidoscopic image of Fan worm (Sabella sp.), Puerta Galera, Philippines.

Georgette Douwma / Kaleidoscopic image of Variegated feather duster (Bispira variegata), Sabellidae. Puerto Galera, Philippines.

David Hall / Red fanworm / mopworm (Protula bispiralis). Komodo, Indonesia.

Pascal Kobeh / Field of Peacock feather dusters / Spiral tube-worms (Sabella spallanzanii), Canary Islands

Pascal Kobeh / Marine polychaete tube worm / feather duster worm (fam. Sabellidae) in a hard coral (fam. Faviidae), Sulu sea, Philippines