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Geology
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