vibraculum

noun, plural vi·brac·u·la [vahy-brak-yuh-luh] /vaɪˈbræk yə lə/.

1. any of the modified polyps on the surface of certain bryozoan colonies, having a long, whiplike appendage that clears away debris.

noun plural -la (-lə)

1. zoology any of the specialized bristle-like polyps in certain bryozoans, the actions of which prevent parasites from settling on the colony