Stylommatophora is a taxon of air-breathing land snails and slugs, terrestrial pulmonate gastropod molluscs. This taxon is currently considered to be a clade. It was previously regarded as an infraorder (also sometimes was considered to be an order). This taxon includes the majority of land snails and slugs.The two strong synapomorphies of Stylommatophora are a long pedal gland placed beneath a membrane and two pairs of retractile tentacles (Dayrat & Tillier).[citation needed]Several families in this group contain species of snails and slugs that create love darts.Stylommatophora are known from the Cretaceous to the Recent periods.