 Natura - nature |
| Mundus Plinius - physical world |
| Naturalia |
| Biota |
| Domain Eukaryota - eukaryotes |
| Kingdom Animalia C. Linnaeus, 1758 - animals |
| Subkingdom Bilateria (Hatschek, 1888) Cavalier-Smith, 1983 - bilaterians |
| Branch Protostomia Grobben, 1908 - protostomes |
| Infrakingdom
"Lophotrochozoa"
- lophotrochozoans |
| Superphylum Eutrochozoa |
| Phylum Mollusca (Linnaeus, 1758) Cuvier, 1795 - molluscs |
 Class Gastropoda Cuvier, 1795 - snails and slugs |
 [Order Neotaenioglossa] see Suborder Neotaenioglossa |
| ?Superfamily †Euomphaloidea White, 1877 |
| ?Superfamily †Macluritoidea Carpenter, 1861 |
 Family †Anomphalidae Wenz, 1938 |
| Superfamily †Clisospiroidea S.A. Miller, 1889 |
| Family †Codonocheilidae S.A. Miller, 1889 |
| Family †Crassimarginatidae Frýda et al., 2002 |
| Family †Holopeidae Cossmann, 1908 |
| Family †Isospiridae Wangberg-Eriksson, 1964 |
| Superfamily †Loxonematoidea Koken, 1889 |
| Superfamily †Ophiletoidea Koken, 1907 |
| Family †Opisthonematidae Yu, 1976, nom. inval. |
| Family †Paraturbinidae Cossmann, 1916 |
| Family †Planitrochidae Knight, 1956 |
| Family †Pragoserpulinidae Frýda, 1998 |
| Family †Pseudophoridae S.A. Miller, 1889 |
| Family †Raphistomatidae Koken, 1896 |
| Family †Rhytidopilidae Starobogatov, 1976 |
| Family †Scoliostomatidae Frýda et al., 2002 |
| Family †Sinuopeidae Wenz, 1938 |
| Superfamily †Straparollinoidea P.J. Wagner, 2002 |
| Superfamily †Trochonematoidea Zittel, 1895 |
| Subclass Eogastropoda Ponder & Lindberg, 1996 |
| [
"prosobranchs"
] see Class Gastropoda Cuvier, 1795 |
| [Subclass Streptoneura] see Subclass Prosobranchia |
| [Subclass Prosobranchia - prosobranchs] see Class Gastropoda Cuvier, 1795 |
| Subclass Orthogastropoda Ponder & Lindberg, 1996 |
| [Subclass Euthyneura] |
| [
"opisthobranchs"
] see Order Opisthobranchia Milne-Edwards, 1848 |
| [Order Vetigastropoda Salvini-Plawen, 1980 - archaeogastropods s.l.] see Superorder Vetigastropoda Salvini-Plawen, 1980 |
| [Order Cocculiniformia] see Superorder Cocculiniformia Haszprunar, 1987 |
| [Order Neritimorpha] see Superorder Neritaemorphi Koken, 1896 |
| [Order Neritoida] see Order Neritimorpha |
| [Order Caenogastropoda] see Superorder Caenogastropoda Cox, 1960 |
| [Subclass Heterobranchia] see Superorder Heterobranchia J.E. Gray, 1840 |
| [Subclass Opisthobranchia Milne-Edwards, 1848 - opisthobranchs] see Order Opisthobranchia Milne-Edwards, 1848 |
| [Order Cephalaspidea P. Fischer, 1883] see Suborder Cephalaspidea P. Fischer, 1883 |
| [Order Thecosomata - shelled pteropods] see Suborder Thecosomata Blainville, 1824 |
| [Order Gymnosomata - naked pteropods] see Suborder Gymnosomata |
| [Order Anaspidea P. Fischer, 1883 - sea hares] see Suborder Anaspidea P. Fischer, 1883 |
| [Order Acochlidea] see Suborder Acochlidiacea |
| [Order Sacoglossa - sacoglossans] see Suborder Sacoglossa von Ihering, 1876 |
| [Order Notaspidea P. Fischer, 1883] see Suborder Notaspidea P. Fischer, 1883 |
| [Order Nudibranchia de Blainville, 1814 - "true" nudibranchs] see Suborder Nudibranchia Blainville, 1814 |
| [Subclass Pulmonata - land snails and slugs] see Order Pulmonata Cuvier, in Blainville, 1814 |
| [
"pulmonates"
] see Order Pulmonata Cuvier, in Blainville, 1814 |
| [Order Eupulmonata] see Suborder Eupulmonata (Haszprunar & Huber, 1990) |
| [Order Rhodopemorpha] see Suborder Nudibranchia Blainville, 1814 |
| [Subclass Opisthopneumona Minichev, 1975] see Order Systellommatophora |