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

Linda Pitkin / 2020VISION / Tube worms (Bispira volutacornis) living between rocks covered in Crustose coralline (Corallinaceae) and red algae (Rhodophyceae), Lundy Island Marine Conservation Zone, Devon, England, UK, May.

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 Variegated feather duster (Bispira variegata), Sabellidae. Puerto Galera, Philippines.

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

Georgette Douwma / Variegated feather duster worm (Bispira variegata) Puerto Galera, Philippines.

Sue Daly / Close-up of a Spiral fan worm (Bispira volutacornis) with tentacles moving in the current, Sark, British Channel Islands, UK, June.

Sue Daly / Group of Spiral fan worms (Bispira volutacornis), Sark, British Channel Islands, UK, June.

Georgette Douwma / Feather duster worm (Bispira sp) Lembeh, Sulawesi, Indonesia.

Sue Daly / Spiral Fan Worm (Bispira volutacornis). Maseline Harbour, Sark, British Channel Islands, July.

Sue Daly / Tube worm / Double sprial worm (Bispira volutacornis) Channel Islands, UK June