noun
- the anterior part of the head of certain segmented worms, located in front of the mouth
Usage: zoology
Examples
- The prostomium of the earthworm contains sensory organs.
- Marine biologists examined the prostomium to identify the polychaete species.
- The prostomium helps the worm navigate through soil.
- Different worm species have distinctly shaped prostomia.
- The prostomium bears tentacles in many marine worms.