k Freshwater snail shells Freshwater snail shells. These are calciumrich structures formed by gastropod molluscs for their protection. The chambers at the centre of a shell are the oldest, with successively larger chambers being added as the animal grows, forming a spiral structure. Brightlycoloured shells like this are often highly prized by collectors. Stock Photo - Afloimages
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Freshwater snail shells Freshwater snail shells. These are calcium rich structures formed by gastropod molluscs for their protection. The chambers at the centre of a shell are the oldest, with successively larger chambers being added as the animal grows, forming a spiral structure. Brightly coloured shells like this are often highly prized by collectors.
RM

Freshwater snail shells

Freshwater snail shells. These are calcium-rich structures formed by gastropod molluscs for their protection. The chambers at the centre of a shell are the oldest, with successively larger chambers being added as the animal grows, forming a spiral structure. Brightly-coloured shells like this are often highly prized by collectors.

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164547751

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