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Pouch Snail
Pollution-Tolerant
They get oxygen directly from air trapped in their shell cavity and thus are less dependent on water quality
Shell is made of calcium carbonate
It’s important that the snail is alive (someone is at home) before counting it in a survey
Shell is spiral, coil or dome shaped
Has no operculum (plate-like door)
Shells usually open on the left side, which can be seen if you hold the shell with its tip pointing up and the opening facing you
