Ecology

Habitat

Depth range based on 230 specimens in 9 taxa.
Water temperature and chemistry ranges based on 221 samples.

Environmental ranges
  Depth range (m): 0 - 409
  Temperature range (°C): 13.402 - 28.373
  Nitrate (umol/L): 0.049 - 10.045
  Salinity (PPS): 34.562 - 36.318
  Oxygen (ml/l): 4.161 - 5.477
  Phosphate (umol/l): 0.067 - 0.816
  Silicate (umol/l): 0.940 - 6.018

Graphical representation

Depth range (m): 0 - 409

Temperature range (°C): 13.402 - 28.373

Nitrate (umol/L): 0.049 - 10.045

Salinity (PPS): 34.562 - 36.318

Oxygen (ml/l): 4.161 - 5.477

Phosphate (umol/l): 0.067 - 0.816

Silicate (umol/l): 0.940 - 6.018
 
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Wikipedia

Triton (gastropod)

X-ray image of the shell of Charonia lampas

Tritons are named after the Greek god Triton, who was the son of Poseidon, god of the sea.

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.

Distribution[edit]

Tritons inhabit temperate and tropical waters worldwide.

Life habits[edit]

Unlike pulmonate and opistobranch gastropods, tritons are not hermaphrodites; they have separate sexes and undergo sexual reproduction with internal fertilization. The female deposits white capsules in clusters, each of which contains many developing larvae. The larvae emerge free-swimming and enter the plankton, where they drift in open water for up to three months.

Feeding behavior[edit]

Adult tritons are active predators and feed on other molluscs and starfish. The giant triton has gained fame for its ability to capture and eat crown-of-thorns starfish, a large species (up to 1 m in diameter) covered in poisonous spikes an inch long. This starfish has few other natural predators and has earned the enmity of humans in recent decades by proliferating and destroying large sections of coral reef.

The struggle between a starfish and an Atlantic triton can last up to an hour before the seastar is subdued by the snail's paralyzing saliva.

Tritons can be observed to turn and give chase when the scent of prey is detected. Some starfish (including the crown-of-thorns starfish) appear to be able to detect the approach of the mollusc by means which are not clearly understood, and they will attempt flight before any physical contact has taken place. Tritons, however, are faster than starfish, and only large 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 starfish'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 gut.

Tritons ingest smaller prey animals whole without troubling to paralyse them, and will spit out any poisonous spines, shells, or other unwanted parts later.

Human use[edit]

Many people find triton shells attractive as a design object, and so they are collected and sold as part of the international shell trade. In recent years this has contributed to the animals' scarcity.

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.

The Greco-Roman god Poseidon / Neptune is often depicted holding a triton shell, as is his son Triton (mythology).

Species and subspecies[edit]

Species and subspecies within the genus Charonia include:


Taxon inquirenda (a taxon of doubtful identity):


Synonymized species
Synonyms for Charonia
  • Buccinatorium Mørch, 1877
  • Eutritonium Cossmann, 1904
  • Nyctilochus Dall, 1912
  • Semiranella de Gregorio, 1880
  • Septa Dall & Simpson, 1901
  • Triton Montfort, 1810 (Invalid: junior homonym of Triton Linnaeus, 1758 [Amphibia])
  • Tritonellium Mørch, 1877
  • Tritonium Röding, 1798

References[edit]

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Source: Wikipedia

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