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Aristotle’s lantern is a complex system of jaws and muscles which are capable of a variety of feeding types including suspension feeding, herbivory and detritivory feeding, and occasionally predation. Adaptations to this lantern have allowed sand dollars to live in habitats which have fine, shifting substrates.
Aristotle's lantern in a sea urchin, viewed in lateral section. The mouth of most sea urchins is made up of five calcium carbonate teeth or plates, with a fleshy, tongue-like structure within. The entire chewing organ is known as Aristotle's lantern from Aristotle's description in his History of Animals (translated by D'Arcy Thompson):
Strongylocentrotus droebachiensis is found on rocky substratum in the intertidal and up to depths of 1,150 meters (3,770 ft). It uses its strong Aristotle's lantern to burrow into rock, and then can widen its home with the spines.
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Sea urchins possess unique jaws which display five-part symmetry, termed the Aristotle's lantern. Each unit of the jaw holds a single, perpetually growing tooth composed of crystalline calcium carbonate .
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The craftsman had evidently chosen to use this flint for his tool; the exposed area around the sea urchin's jaws known as Aristotle's lantern are clearly visible. Similar examples are known from France, Western and Central Europe, and Northern Africa; they span Paleolithic, Neolithic, Bronze Age and Iron Age times. [6]