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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):
Page one of Aristotle's On the Heavens, from an edition published in 1837. On the Heavens (Greek: Περὶ οὐρανοῦ; Latin: De Caelo or De Caelo et Mundo) is Aristotle's chief cosmological treatise: written in 350 BCE, [1] it contains his astronomical theory and his ideas on the concrete workings of the terrestrial world.
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.
Lawmakers from across the political spectrum on Sunday criticized the federal government’s response to mysterious drone sightings in the Northeast, as officials emphasize there is no evidence of ...
Elon Musk hosted a a wide-ranging conversation on X that touched on immigration, energy policy, space colonization, God and Adolf Hitler.
Maps and electoral vote counts for the 2012 presidential election. Our latest estimate has Obama at 323 electoral votes and Romney at 191.
WASHINGTON (Reuters) -A U.S. federal appeals court on Friday upheld a law requiring Chinese-based ByteDance to divest its popular short video app TikTok in the United States by early next year or ...
From January 2008 to December 2012, if you bought shares in companies when James H. Blanchard joined the board, and sold them when he left, you would have a -18.8 percent return on your investment, compared to a -2.8 percent return from the S&P 500.