Phylum Mollusca Linnaeus, 1758 - molluscs
Class Gastropoda Cuvier, 1795 - snails and slugs
Subclass Prosobranchia Milne-Edwards, 1848 - prosobranchs
see Class Gastropoda Cuvier, 1795
Order Neogastropoda Wenz, 1938
see Suborder Neogastropoda Wenz, 1938
Suborder Stenoglossa Bouvier, 1887
Superfamily Cancellarioidea Forbes & Hanley, 1851 [monotypic]
Family Cancellariidae Forbes & Hanley, 1851 - nutmeg snails
Subfamily Cancellariinae Forbes & Hanley, 1851
Genus Trigonostoma Blainville, 1827
1 Subgenus Arizelostoma Iredale, 1936
2 Subgenus †Extractrix Korobkov, 1955
3 Subgenus †Junghuhnia Martin, 1931
4 Subgenus †Ovilia Jousseaume, 1887
5 Subgenus Ventrilia Jousseaume, 1887