What is a pedicellaria? Here are some definitions.
Noun
(biology) A small, stalk-shaped structure of the sea urchin and other echinoderms, which has three pincer-like structures at the end that perform cleaning functions and serve as defense against predators.
Examples
Pedicellaria are a good means of defense against ectoparasites, but not a panacea as some of them actually feed on it.