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 Acteonoidea d'Orbigny, 1843
           Family Cylichnidae Adams & Adams, 1854
             01 Genus Scaphander Montfort, 1810
             02 Genus Acteocina Gray, 1847
             03 Genus Cylichna Lovén, 1846
             04 Genus Cylichnatys Kuroda & Habe, 1952
             05 Genus Cylichnella Gabb, 1873
             06 Genus Mamillocylichna Nordsieck, 1972
             07 Genus Meloscaphander Schepman, 1913
             08 Genus Micraenigma Berry, 1953
             09 Genus Mirascapha Stewart, 1927
             10 Genus Nipponoscaphander Kuroda & Habe, 1971 see Genus Scaphander Montfort, 1810
             11 Genus Paracteocina Minichev, 1966
             12 Genus Roxania Gray, 1847
             13 Genus Utriculastra Thiele, 1925
             14 Genus Utriculopsis Sars, 1870