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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 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.
Oral surface of Strongylocentrotus purpuratus showing teeth of Aristotle's Lantern, spines and tube feet. Strongylocentrotus purpuratus. Strongylocentrotus purpuratus is a species of sea urchin in the family Strongylocentrotidae commonly known as the purple sea urchin.
1 - genital plate 2 - gonopore 3 - anus 4 - hard plate with madreporite 5 - axial gland 6 - gonad 7 - intestine 8 - ampullae 9 - test 10 - radial canal 11 - esophagus 12 - Aristotle’s lantern 13 - teeth 14 - mouth 15 - nerve ring 16 - ring canal 17 - test plates 18 - tube feet 19 - spines
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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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A Southern California woman caught a group of careless idiots launching fire-powered lantern balloons into the sky near a nature preserve -- even as wildfires devastated Los Angeles communities ...