Vertigo gouldii, common name the variable vertigo, is a species of small air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Vertiginidae, the whorl snails.SubspeciesVertigo gouldii arizonensis Pilsbry & Vanatta, 1900 Vertigo gouldii coloradoensis (Cockerell, 1891) Vertigo gouldii inserta Pilsbry, 1919