Christmas tree worm, Spirobranchus sp.     (Family Serpulidae)

Location: Challenger Bay, Ribbon Reef #10, Great Barrier Reef, Australia

Depth: 6.9 m

Equipment: Nikon D70 with Nikkor 18-55mm f/3.5-5.6G ED II in Ikelite housing and 2 x Ikelite DS125

Settings: @ 55mm, ISO200, 1/160s, f/11