Georgette Douwma / Coral worms (Filograna implexa / Serpulidae). A colonial species of worm that builds irregular masses of calcareous tube. West Papua, Indonesia.

Georgette Douwma / Feather duster worms ( Filogranella elatensis) Indonesia.

Pascal Kobeh / Christmas tree worm (Spirobranchus giganteus) Maldives, Indian Ocean.

Pete Oxford / Christmas tree worm (Spirobranchus sp) Fiji, South Pacific.

Pete Oxford / Christmas tree worms (Spirobranchus sp) Fiji, South Pacific.

Pete Oxford / Christmas tree worm (Spirobranchus sp) Rainbow Reef, Fiji, South Pacific.

Pascal Kobeh / Magnificent tube worm (Protula magnifica) Madagascar. Indian Ocean.

Sue Daly / Post Horn Worms (Spirorbis) on seaweed, on beach, Derrible Bay, Sark, British Channel Islands.

Alex Mustard / High magnification detail of filter feeding appendage of Christmas tree worm (Spirobranchus giganteus) Misool, Raja Ampat, West Papua, Indonesia. Ceram Sea, Tropical West Pacific Ocean.

Solvin Zankl / Christmas tree worms (Spirobranchus giganteus) on Porites coral (Porites sp) Raja Ampat, West Papua, Indonesia, Pacific Ocean.

Nick Upton / Keelworm (Pomatoceros lamarcki) with filter feeding tentacles visible at the mouth of its tube, attached to boulder in a rockpool, Lyme Regis, Dorset, UK, May.

Roland Seitre / Christmas Tree Worms (Spirobranchus giganteus) Jokin, Lifou, Loyalty Islands Province, New Caledonia