Claim: Palazzia planorbis is a sea snail species in the superfamily of Seguenzioidea, within the Gastropoda class, and under the Mollusca phylum.
Evidence: Palazzia planorbis is a species of sea snail, a marine gastropod mollusk, unassigned in the superfamily Seguenzioidea. Superfamily: Seguenzioidea Class: Gastropoda Phylum: Mollusca