Osedax mucofloris extends out of the whale bone into the seawater. The major features of this portion are:
- Feathered plumes, which are the gills, or branchiae, that bring oxygen down to the root structure embedded in the whale bone.
- A cylinder-shaped column that extends furthest into the water column. Scientists think this structure, an oviduct, shoots fertilised eggs into the water column, perhaps helping the animal to disperse tiny larvae to be carried off by ocean currents.
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