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Category:Helcionelloida

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Articles relating to the Helcionelloida, an extinct group of ancient molluscs (phylum Mollusca). These are the oldest known conchiferan molluscs, that is, they had a mineralised shell.

Wikimedia Commons has media related to Helcionelloida.

Subcategories

This category has the following 4 subcategories, out of 4 total.

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