Helcionelloida
class of molluscs / From Wikipedia, the free encyclopedia
The Helcionelloida are an extinct class of fossil molluscs.
Quick Facts Scientific classification, Orders ...
Helcionelloida | |
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Latouchella costata | |
Scientific classification ![]() | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Mollusca |
Class: | †Helcionelloida Peel, 1991 |
Orders | |
and see text |
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![Thumb image](http://upload.wikimedia.org/wikipedia/commons/thumb/1/16/Pelagiella_atlantoides.jpg/320px-Pelagiella_atlantoides.jpg)
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.[1]
The latest word on this group is the classification of Parkhaev, who splits it into three subclasses.[2][3]