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Mollusca
Gastropoda
Heterobranchia [Unassigned]
Heterobranchia [Unassigned]
Phylum:
Mollusca
Class:
Gastropoda
Order:
Heterobranchia [Unassigned]
Families of Heterobranchia [Unassigned] present in the Cretaceous of the Western Interior Seaway
Acteonidae
Mathildiidae
Pyramidellidae
Ringiculidae
Siphonariidae
![Heterobranchia [Unassigned]](https://www.cretaceousatlas.org/wp-content/uploads/2018/11/Ambrosea_nitida-Stephenson-1953-TN-250px.png)
