One of the largest snails in the sea, a shell to 60 cm (24 in) with a living animal inside it patterned in cream and orange that looks far too big to fit. Slow, nocturnal, and one of the few predators a crown-of-thorns starfish has.
Sea stars are armored, chemically defended and quite capable of walking away, so the triton does the job by weight: it hauls itself onto the prey, pins it, and works a proboscis in under the arms while secreting saliva laced with sulfuric acid to subdue it. The acid does the softening; the snail does the rest, over hours.
Its effect on the reef is larger than its appetite. A triton does not eat enough starfish to control an outbreak by itself, but the smell of one in the water makes crown-of-thorns break off feeding and move away, and a reef with tritons on it is a reef where the starfish keep dispersing rather than aggregating. Fear does what predation alone cannot.
Which is why the shells are the problem. They are beautiful, they were collected by the ton for the curio trade, and in most of the Indo-Pacific this animal is now rare. Protected in many countries. If you find one on the reef, that is the reason it is worth leaving there - and worth photographing, because the record matters.
- huge heavy shell to 60 cm, cream with crescent brown markings
- tall spire and a wide flared opening
- living animal patterned in cream and orange, far larger than the shell suggests
- shell length up to 60 cm
