Helcionelloida

Helcionelloida is 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.

Helcionelloida
Temporal range:
Latouchella costata
Scientific classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Mollusca
Subphylum: Conchifera
Class: Helcionelloida
Peel, 1991
Orders

and see text

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