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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.
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):
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.
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.
The name echinoderm is from Ancient Greek ἐχῖνος (ekhînos) ' hedgehog ' and δέρμα (dérma) ' skin '. [4] The name Echinodermata was originated by Jacob Theodor Klein in 1734, but only in reference to echinoids. It was expanded to the phylum level by Jean Guillaume Bruguière, first informally in 1789 and then in formal Latin in 1791.
The mouthparts, known as the Aristotle's lantern, have simple plates and grooved teeth. The gills are relatively small, and in many species, entirely absent. The gills are relatively small, and in many species, entirely absent.
Many of the immigrants responsible for the popularity of the jack-o-lantern in the United States—and its name—were Irish, what with Samhain’s Celtic origins. “Stingy Jack is a later Irish ...
Spines from the oral face are ending with a hyaline hoof, which allows walking on soft substrate. The jaw (Aristotle's lantern) has five aulodont teeth. [2] This family seems to have appeared at the end of the Cretaceous. [2]