Perturber :: Perturber (n.) One who, or that which, perturbs, or cause perturbation..
Turbellaria :: Turbellaria (n. pl.) An extensive group of worms which have the body covered externally with vibrating cilia. It includes the Rhabdoc/la and Dendroc/la. Formerly, the nemerteans were also included in this group..
Turbellarian :: Turbellarian (n.) One of the Turbellaria. Also used adjectively.