Claim: Athearnia is in the Pleuroceridae family, within Cerithioidea (a superfamily of marine, brackish water and freshwater gastropod), and under the Gastropoda class.
Evidence: Family: Pleuroceridae Cerithioidea Superfamily: The Cerithioidea is a superfamily of marine, brackish water and freshwater gastropod containing more than 200 genera. Gastropoda Class: