What are the features of the external structure of the common pond snail as a gastropod mollusk?

The common pond snail is a gastropod mollusk, therefore, it has the following features of the external structure:

it has one spirally wound shell;
the body consists of three sections – head, legs and torso;
the body is attached to the shell using a fold of skin – the mantle;
between the mantle and the body there is a mantle cavity;
on the head are the senses – eyes and tentacles.

A pond snail, like a freshwater mollusk, has a respiratory opening in the mantle cavity through which it breathes atmospheric air.