Euthyneura

Euthyneura is a taxonomic infraclass of snails and slugs, which includes species exclusively from marine, aquatic and terrestrial gastropod mollusks in the clade Heterobranchia. Euthyneurans are a diverse group, containing about 40% of the known species of gastropods, including the major land snail and slug clade Stylommatophora, which contains over 20,000 species, various sea slug lineages such as nudibranchs, the parasitic sea snail family Pyramidellidae, one of the most diverse families of gastropods with over 6,000 species, and several other lineages of snails and slugs from a variety of h

Tectipleura is a subterclass of land and water-dwelling gastropods.