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Echinus sea urchins suspension feed by using ciliary band that extends across the body of the pluteus, removing particles from any surface. Those particles then become confined by the pedicellaria of the sea urchin and carried to the mouth, also known as Aristotle's lantern. [4]
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):
The green sea urchin has a structure called an Aristotle's lantern surrounding its mouth on its oral (under) surface. This has five teeth that can be used to rasp surfaces. It is largely herbivorous, feeding on the seagrass Thalassia. Its tube feet and spines also play a role in feeding, catching and holding bits of debris that float past. [4]
Strongylocentrotus droebachiensis eats by using a special appendage called an Aristotle’s lantern to scrape or tear their food into digestible bits. This structure is made of five calcareous, protractible teeth that are maneuvered by a complex muscular structure.
All camarodonts have imperforate tubercles and compound ambulacral plates with the lowest elements enlarged. The pores are at regular intervals along the ambulacral plates from the apex to the mouth opening or peristome. The Aristotle's lantern, or jaw system, has keeled teeth with the supports meeting above the "foramen magnum". [2]
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The tubercles lack the crenulations or ring of cog-like structures that articulate with the spines in certain other families. The Aristotle's lantern, or jaw apparatus, has the keeled teeth and the epiphyses united above the foramen magnum, the V-shaped gap between the hemipyramids that support the lantern's tooth. [2]
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