Christmas Tree Worm
Fig. 143: The gills of a christmas tree worm, living in its tube in a stone coral. There weren't many of them around here. Dive #368: Sabang Laguna, Mindoro Island, Philippines. — EXIF: Nikon D200; Δt=1/250 s; f=105 mm; f/22.0; ISO 100; 2009-11-15 4:10:24