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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):
Embedded in the peristome are five calcareous "teeth" collectively known as Aristotle's lantern. These are used for grinding the flower urchin's food. The anus is situated on the upper (aboral) surface of the test, directly opposite the mouth. Like the mouth, it is surrounded by a ring of small plates known as the periproct.
Many sea urchins feed on algae, often scraping off the thin layer of algae covering the surfaces of rocks with their specialised mouthparts known as Aristotle's lantern. Other species devour smaller organisms, which they may catch with their tube feet.
The works of Aristotle, sometimes referred to by modern scholars with the Latin phrase Corpus Aristotelicum, is the collection of Aristotle's works that have survived from antiquity. According to a distinction that originates with Aristotle himself, [ citation needed ] his writings are divisible into two groups: the " exoteric " and the ...
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Enjoy a classic game of Hearts and watch out for the Queen of Spades!
Adobe expects foreign exchange volatility and the company's shift towards subscriptions to cut into its fiscal 2025 revenue by about $200 million. The company is making significant investments in ...
Hippocrates Apostle, Aristotle's On the Soul, (Grinell, Iowa: Peripatetic Press, 1981). ISBN 0-9602870-8-6; D.W. Hamlyn, Aristotle De Anima, Books II and III (with passages from Book I), translated with Introduction and Notes by D.W. Hamlyn, with a Report on Recent Work and a Revised Bibliography by Christopher Shields (Oxford: Clarendon Press ...