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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):
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]
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 have allowed sand dollars to live in habitats which have fine, shifting substrates.
Echinothurioids have regular tests (shells) with 10 columns of plates. These plates are fused in groups of three with a central primary plate and a half plate on either side. The edge of each group of plates overlaps the next one in the manner of tiles on a roof and this means the test is flexible.
The World Echinoidea Database recognises these genera: [3] Subfamily Echinothuriinae Thomson, 1872a. genus Araeosoma Mortensen, 1903b - 19 current species and two fossils; genus Asthenosoma Grube, 1868 - six current species and one fossil; genus Calveriosoma Mortensen, 1934 - two species; genus Hapalosoma Mortensen, 1903b - four species
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 ...
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.
This peculiar, specialized, technical, usage of the word 'cause' is not that of everyday English language. [4] Rather, the translation of Aristotle's αἰτία that is nearest to current ordinary language is "explanation." [5] [2] [4] In Physics II.3 and Metaphysics V.2, Aristotle holds that there are four kinds of answers to "why" questions ...