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    • Helcionelloida


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Recent observations

No one's observed in Class Helcionelloida.
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Description from Wikipedia

Helcionelloida is the name given to an extinct group of ancient molluscs (phylum Mollusca). These are the oldest known conchiferan molluscs, that is, they had a mineralised shell. Some members of this class were mistaken for Monoplacophorans. The class was erected by Peel in 1991.

No range data available.
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