Phylum Mollusca Linnaeus, 1758 - molluscs
Class Gastropoda Cuvier, 1795 - snails and slugs
Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs
see Order Opisthobranchia Milne-Edwards, 1848
Order Sacoglossa Ihering, 1876 - sacoglossans
Suborder Tamanovalvina
Superfamily Julioidea
see Superfamily Oxynooidea Stoliczka, 1868 (1847)
Family Polybranchiidae O'Donoghue, 1929
see Family Caliphyllidae Tiberi, 1881
Subfamily Polybranchiinae O'Donoghue, 1929
Genus Polybranchia Pease, 1860