Sacoglossa, commonly known as the sacoglossans or the sap-sucking sea slugs, are a clade of small sea slugs and sea snails, marine gastropod mollusks that belong to the clade Heterobranchia. Sacoglossans live by ingesting the cellular contents of algae, hence the name sap-sucking-slugs.
Accordance WoRMS:
Biota Animalia (Kingdom) Mollusca (Phylum) Gastropoda (Class) Heterobranchia (Subclass) Euthyneura (Infraclass) Tectipleura (Subterclass) Sacoglossa (Superorder