Template:Gastropoda taxonomy

† Paleozoic molluscs of uncertain systematic position † Basal taxa that are certainly Gastropoda Patellogastropoda Vetigastropoda Cocculiniformia Neritimorpha † Paleozoic Neritimorpha of uncertain systematic position † Cyrtoneritimorpha Cycloneritimorpha  Caenogastropoda  Caenogastropoda of uncertain systematic position Architaenioglossa Sorbeoconcha  Hypsogastropoda  Littorinimorpha Ptenoglossa Neogastropoda Heterobranchia Lower Heterobranchia  Opisthobranchia  Cephalaspidea Pteropoda: Thecosomata Pteropoda: Gymnosomata Aplysiomorpha Acochlidiacea Sacoglossa Cylindrobullida Umbraculida  Nudipleura  Pleurobranchomorpha  Nudibranchia  Euctenidiacea  Dexiarchia  Pseudoeuctenidiacea  Cladobranchia  Euarminida Dendronotida Aeolidida Pulmonata Basommatophora  Eupulmonata  Systellommatophora  Stylommatophora  Elasmognatha Orthurethra Sigmurethra