Vibraculum

noun

1. One of the long bristlelike zooids of a bryozoan, which move in a whiplike manner.
2. One of the long filamentous or flagelliform appendages of the cells or ectocysts of many polyzoans, usually articulated with short dilated processes of the ectocyst, and executing constant lashing movements by the contraction of muscles contained in their dilated bases; a flabellarium.
3. One of the movable, slender, spinelike organs or parts with which certain bryozoans are furnished. They are regarded as specially modified zooids, of nearly the same nature as Avicularia.
4. A long, whiplike, modified zooid on the surface of certain colonies of bryozoa