Claim: Protolira thorvaldssoni is in the Skeneidae family, within the Trochoidea superfamily, and under the Vetigastropoda subclass.
Evidence: Protolira thorvaldssoni is a species of sea snail, a marine gastropod mollusk in the family Skeneidae. Superfamily: Trochoidea Subclass: Vetigastropoda 
Superfamily: Trochoidea Family: Skeneidae Subclass: Vetigastropoda