The Mexican turbo snail can reach a size of 4 in / 10 cm, but such a large size is uncommon and most specimens never get bigger than 2 in / 5 cm. The Mexican turbo snail is protected by thick brown shell shaped like a top or a turban. When the snail is frightened or wants to rest, it will withdraw itself into the irridescent interior of the shell and close the opening with a cover, a so called operculum. The Mexican turbo snail moves using its foot which can be extended out of the shell. The mouth and eyes can also be extended out of the shell, but all body parts are instantly retracted if the snail is spooked.