Achatinella mustelina is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusc in the family Achatinellidae.

All 13 subspecies of Achatinella mustelina were synonymized with the species by Holland & Hadfield (2007),[3] because they are not monophyletic.

Achatinella mustelina attaches itself to leaves at the tops of native trees and shrubs such as Metrosideros polymorpha, Dubautia plantanginea, Myrsine lessertiana, Pisonia sandwicensis, Antidesma platyphyllum and Nestegis sandwicensis.

Range Elevation: 600 to 1,158 m (1,970 to 3,800 ft)[4] Achatinella mustelina from different locations vary in size, shape, and color.

They have a lengthy gestation period and give birth to large, live young that mature late and have a low fecundity.