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Why so many molluscs exhibit sinistral winding? The estimates of the number of molluscs vary quite greatly between 50,000 and 200,000 species. Of those molluscs species, about 70'000 are Gasteropoda. Gasteropa is most diverse Mollusca phylum. The winding you describe is present in all Gasteropoda and is often called the torsion. So the answer to why there ...

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