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
             Tribe Berthellini Burn, 1962
               1 Genus Berthella Blainville, 1824
               2 Genus Bathyberthella Willan, 1983
               3 Genus Berthellina Gardiner, 1936
               4 Genus Pleurehdera Marcus & Marcus, 1970