How do sea urchins use Aristotle’s lantern to feed?

Sea urchins utilize Aristotle’s lantern, a complex, five-sided masticatory apparatus, to feed by extruding its hard teeth to scrape algae and other small organisms from rocky surfaces.12

This protrusible structure consists of teeth, supporting ossicles, and activating muscles. Beyond scraping food, the apparatus is powerful enough to allow some species to excavate hiding places in coral, rock, and even steel. While regular sea urchins primarily use this mechanism as omnivorous or vegetarian browsers, it is notable that more advanced, irregular echinoids typically lack this dental apparatus entirely and instead rely on spines and tube feet to gather food.321