Alcadia pellucida is a species of an operculate land snail, terrestrial gastropod mollusk in the family Helicinidae.
(Original description in Latin) The shell is similar to Helicina zephyrina <small>Duclos, 1833</small>, but with the columella nearly straight and somewhat angular.
A more transparent shell than Helicina zephyrina, with the columella nearly straight, and joining the outer lip at an angle.
This species occurs in French Guiana.