Subclass Heterobranchia
- All
- Order Acteonoidea
- Order Anaspidea
- Order Cephalaspidea
- Order Cladobranchia - Aeolidida
- Order Cladobranchia - Dendronotida
- Order Cladobranchia - Euarminida
- Order Cladobranchia - unplaced
- Order Euctenidiacea - Doridacea
- Order Lower Heterobranchia
- Order Pulmonata - Basommatophora
- Order Pulmonata - Eupulmonata
- Order Pulmonata - Eupulmonata - Systellommatophora
- Order Runcinacea
- Order Sacoglossa - Oxynoacea
- Order Sacoglossa - Placobranchacea
- Order Thecosomata
- Order Umbraculida
