Sea snail

Live sea snail, species Nataea, photographed in situ

Sea snail is a common term for marine gastropods (gastropods that live in the sea).^[1] It is not a formal term, just a term in common use.

Charonia, the shell of a sea snail called Triton's trumpet

A species of sea snail in its natural habitat: two wentletraps

Sea Snail Media

A sea snail Euthria cornea laying eggs
The shell of Syrinx aruanus can be up to 91 cm long.
A 50-second video of snails (most likely Natica chemnitzi and Cerithium stercusmuscaram) feeding on the sea floor in the Gulf of California, Puerto Peñasco, Mexico.
A hermit crab occupying a shell of Acanthina punctulata has been disturbed, and has retracted into the shell, using its claws to bar the entrance in the same way the snail used its operculum.