Linked from
The 50 pages that link to Mollusca, each with the reason it gives.
ExoskeletonRelated: Many mollusks secrete external shells, a distinct form of protective covering.
TrematodaRelated: Snails serve as essential intermediate hosts for nearly all trematode lineages.
TurnstoneRelated: Mollusks among shells and rocks are part of the turnstone’s coastal prey.
HalkieriidRelated: Halkieriids share traits used to argue for an early position near molluscs.
OrthonectidaRelated: Other orthonectids live in molluscan hosts, including cephalopods.