radiole
From ZooTerms (Dictionary of Invertebrate Zoology)
Annelida: Polychaeta) Featherlike head structures forming a crown, or modified into a long stalked knob (operculum); functioning in filtering particles for food.
radiole (noun; Latin diminutive radius, ray): 1. (
2. (Echinodermata: Echinoidea) The spine of sea urchins.