Alcadia sericea is a species of an operculate land snail, terrestrial gastropod mollusk in the family Helicinidae.

[2] (Original description in Latin) The globular-trochiform shell is thin, smooth and shiny below and slightly striated above.

The aperture is hemispherical, and the peristome is reflexed, either white or pink, and somewhat sinuous at the base.

The operculum is solid, somewhat opaque, and gray.

[3] This species occurs in French Guiana and Suriname.