MonadeniinaeMonadeniinae is a taxonomic subfamily of small to medium-sized air-breathing land snails, terrestrial pulmonate gastropod mollusks in the family XanthonychidaeAnatomyThis subfamily is defined by an absent diverticulum. The species have one dart apparatus, a stylophore, one mucous gland, with a muscular duct that is inserted at base of the dart sac.GeneraGenera within the subfamily Modaneiinae include:Monadenia Pilsbry, 1895 - type genus