Proving once again that the things we know as ugly, on land.... can be pretty underwater.
The colorful design you see (spots surrounded by a black outline), looks like it is on the is the shell.... but it is not.
This is in fact live tissue (the mantle) that covers a plain shell.
The mantle can be retracted to expose the bare shell.
But that usually happens only if the snail is attacked or when it dies.
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