Subclass Euthyneura Spengel, 1881
Group of Gastropods also known as: Pulmonata comprising the freshwater and land gastropods plus Opisthobranchia comprising monoecious marine species with reduced shells. The Pulmonata consists of the superorders Tectibranchia (to which the Pteropoda belongs) and the Nudibranchia. The Pulmonata consists of the superorders Stylommatophora and Basommatophora.