In nature, where can "Aristotle's lantern" be found?

Aristotle's lantern is the mouth structure of a sea urchin or a sand dollar.

The mouth, on the underside of the body, has a complex dental apparatus called Aristotle’s lantern, which also may be venomous. The teeth of Aristotle’s lantern are typically extruded to scrape algae and other food from rocks, and some urchins can excavate hiding places in coral or rock—even in steel. Sea urchins live on the ocean floor, usually on hard surfaces, and use the tube feet or spines to move about. In addition, a few carnivorous species have been described.

https://www.britannica.com/science/Aristotles-lantern

Aristotle is believed to have been the first to study the structure of the Urchin's mouth and thus why it is named after him. As for why it is called a lantern is due to the resemblance of a later, or at least one from over 2,000 years ago.

The below site has some excellent photos of the bone structure of an Aristotle's lantern.

https://themarinedetective.com/2020/09/13/aristotles-lantern/