Helcionelloida

Helcionelloida; Temporal range:
	Latouchella costata
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Subphylum:	Conchifera
Class:	†Helcionelloida; Peel, 1991
Orders
	Order Helcionelliformes; Order Pelagialliformes; Order Khairkhaniiformes; Order Onychochiliformes; and see text

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.

This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.