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 Cephalaspidea Fischer, 1883
         Superfamily Runcinoidea Adams & Adams, 1854
           Family Runcinidae Adams & Adams, 1854
             Subfamily Ilbinae Burn, 1963, orth. inval. see Subfamily Ilbiinae Burn, 1963
               1 Genus Ilbia Burn, 1963
               2 Genus Pseudoilbia Miller & Rudman, 1968