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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):
In the center of the test, the West African Sand Dollar has a feeding device called “Aristotle’s lantern.” 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 ...
Oral surface of Strongylocentrotus purpuratus showing the teeth of the Aristotle's Lantern, which can make the trace Gnathichnus.. Gnathichnus is a trace fossil on a hard substrate (typically a shell, rock or hardground made of calcium carbonate) formed by regular echinoids as they scraped the surface with their five-toothed Aristotle's Lantern feeding structures.
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]
Other large specialist plates surround the mouth in a set of jaws known as Aristotle's lantern. [4] Sea stars have separate plates giving flexibility to the disc and arms. They are arranged into interambulacral and ambulacral regions and the arms have an ambulacral groove on the underside from which the tube feet project.
Oil extended gains to hit a five-month high on Monday as worries grew over supply disruptions impacting big importers China and India following wide-ranging sanctions against Russian crude.
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By Bo Erickson. WASHINGTON (Reuters) - A staffer for a U.S. House of Representatives Democrat was arrested at the Capitol on Monday when a regular security check turned up ammunition in his bag ...
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