Template:Gastropoda taxonomy

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† 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