Alinda viridana is a species of air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Clausiliidae, the door snails.
The length of the shell attains 20 mm, its diameter 4.3 mm.
(Original description in Latin of Clausilia montana) The shell is fusiform-cylindrical with an arched slit. It is solid, tightly folded, and slightly glossy, with a horn-yellow coloration. The spire is cylindrical, gradually tapering to a blunt apex, and the suture is impressed with a slight margin. The shell consists of 13 whorls, with the first 9 to 10 being convex and the subsequent ones somewhat flattened. The body whorl is rough at the front, featuring a very short crest at the base. The aperture is oblong-pyriform, with a moderately sized upper lamella and a deep, slightly branched lower lamella. The crescent-shaped fold is narrow, accompanied by a single upper palatal fold, while the columellar fold is slightly submerged. The peristome is continuous, free, and only slightly expanded, with a thick white lip on the inside.
This species occurs in Romania.