It was long believed that the Dracunculus medinensis parasite, which causes guinea worm disease in humans, has a fairly simple life cycle: A person drinks water contaminated with copepods, or water ...

These strange worms are a type of polychaete worm that belong to the family Nereididae commonly known as clam worms. Polycheate worms are set apart from other marine worms by bristles (known as cheate ...