Representative mollusks. Bivalves have a shell with two halves. Filter feeders, they take in food elipsis
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Triton is the common name given to a number of very large sea snails, predatory marine gastropods in the genus Charonia. The name "triton" is also often applied to other, much smaller sea snails of the genus Cymatium, within the same family, Ranellidae.
The shell of the giant triton, Charonia tritonis (Linnaeus, 1758), which lives in the Indo-Pacific faunal zone, can grow to over half a metre (20 inches) in length. One slightly smaller but still very large species, Charonia variegata (Lamarck, 1816), lives in the western Atlantic, from North Carolina to Brazil.
Tritons can be observed to turn and give chase when the scent of prey is detected. Some sea stars (including the crown-of-thorns starfish) appear to be able to detect the approach of the mollusk by means which are not clearly understood, and they will attempt flight before any physical contact has taken place. Tritons, however, are faster than sea stars and only larger starfish have a reasonable hope of escape, and then only by abandoning whichever limb the snail seizes first.
The triton grips its prey with its muscular foot and uses its toothy radula (a serrated, scraping organ found in gastropods) to saw through the sea star's armoured skin. Once it has penetrated, a paralyzing saliva subdues the prey and the snail feeds at leisure, often beginning with the softest parts such as the gonads and guts.
Tritons will ingest smaller prey animals whole without troubling to paralyse them, and will spit out any poisonous spines, shells or other unwanted parts later.
From ancient times, people of many different cultures have removed the tip of the shell, or drilled a hole in the tip, and then used the shell as a trumpet.