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Helcionelloida facts for kids

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Helcionelloida
Temporal range: Early Cambrian–Early Ordovician
Latouchella costata.JPG
Latouchella costata
Scientific classification e
Kingdom: Animalia
Phylum: Mollusca
Class: Helcionelloida
Peel, 1991
Orders
  • Order Helcionelliformes
  • Order Pelagialliformes
  • Order Khairkhaniiformes
  • Order Onichochiliformes

and see text

Pelagiella atlantoides
Pelagiella atlantoides

The Helcionelloida are an extinct class of fossil molluscs.

They are among the earliest animals with mineralised shells. They are also the oldest known molluscs wth a shell. Some members of this class were mistaken for Monoplacophorans. The class was erected by Peel in 1991.

The latest word on this group is the classification of Parkhaev, who splits it into three subclasses.

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