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 Notaspidea Fischer, 1883 [monotypic] see Suborder Notaspidea Fischer, 1883
         Superfamily Pleurobranchoidea Gray, 1827
           Family Pleurobranchidae Gray, 1827
             1 Genus Tomthompsonia Wägele & Hain, 1991
             2 Tribe Pleurobranchini Gray, 1827 [monotypic]
             3 Tribe Berthellini Burn, 1962
             4 Subfamily Pleurobranchaeinae Pilsbry, 1896