Sinistral snail

A sinistral snail is a snail whose shell is curled in the inverse direction, turned towards the left. They are particularly rare on the surface of the planet.

(a) and (c): Sinistral snail shells
(b) and (d): "Right-handed" snail shells
Courtesy of G Dietl/J Hendricks/Biology Letters

(a) and (c): Sinistral snail shells (b) and (d): "Right-handed" snail shells Courtesy of G Dietl/J Hendricks/Biology Letters

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Sinistral snail

Single-stranded

Sinusitis