Stramonita biserialis is fairly small, with the shells of adults typically being 4-6cm long, although they can be bigger or smaller depending on their age.

A bigger operculum and foot area allow them to have much stronger attachment strength, which is probably also the reason behind their higher metabolic rate.

Even though the food needs to be shared, this, combined with the toxins, allow S. biserialis to hunt prey many times faster than other sea snails, some of which can take up to a week to complete a drill hole.

This is most likely due to the fact that Stramonita shells are heavier, which ends up being a boon in heavily wave-washed areas, as it allows them to spend less energy fighting the pull of the waves.

[4] Contrarily, during times of stress (i.e. when a predator is nearby) hermit crabs tend to prefer shells that are lighter, in order to better be able to flee.