''Pseudoperna'' is a genus of

extinct Extinction is the termination of a kind of organism or of a group of kinds (taxon), usually a species. The moment of extinction is generally considered to be the death of the last individual of the species, although the capacity to breed and ...

very small oysters. ''Pseudoperna'' lived in tight groups. This small oyster is commonly found attached in groups to the shell of large species such as '' Inoceramus''. '' Pycnodonte'' and ''Pseudoperna'' are preserved mostly as calcitic valves and are also found attached to '' Mytiloides''.

References

Ostreidae Prehistoric bivalve genera Cretaceous bivalves Prehistoric bivalves of North America Cretaceous animals of South America {{paleo-bivalve-stub