Alopia plumbea is a species of small, tropical, air-breathing land snail, a terrestrial pulmonate gastropod mollusk in the family Clausiliidae.

(original description in Latin) The shell has as slit and is fusiform, and swollen, with a livid hue and a slightly smooth surface.

[2] (Description originally in Latin of Clausilia plumbea) It differs noticeably from other species in this genus: it is smaller in size, with a more slender, livid shell that is sometimes frosted.

The suture is lined with a white thread, and the third palatal fold is short, merging with the second.

Smaller specimens resemble Delima albocincta) (L. Pfeiffer, 1841) but can be immediately distinguished by the absence of a lunella."