Helicina (Alcadia) rhamphostyla L. Pfeiffer, 1857 (original combination) Alcadia rhamphostyla is a species of an operculate land snail, terrestrial gastropod mollusk in the family Helicinidae.

(Original description in Latin) The shell has a conoidal-globose shape.

The spire is shortly conoidal and somewhat obtuse and contains 4.5 whorls.

The columella is broad, expanding above into a thick, semicircular callus and curving to the right at the base.

The peristome is expanded and thin, calloused inside, with the right margin somewhat spreading.