Category:Helcionelloida

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.

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Subcategories

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

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Pages in category "Helcionelloida"

The following 11 pages are in this category, out of 11 total.

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This category content has been reduced to only pages contained in the ZIM file.

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