Goniobasis pliciferaOxytrema silicula (Gould) Juga plicifera, common name pleated juga,[2] and graceful keeled horn snail[3] is a species of small freshwater snail with an ovate and corneous operculum, ranging in size from 16mm to 35mm long.

Juga plicifera is distributed throughout northwestern Oregon and Washington, USA, and is found in lakes, rivers, creeks, and tributaries.

[4] Juga plicifera can be found clinging to rocks or substrate in slow flowing streams, as well as in the muddy-sand bottoms of small and medium lakes with a preference for shaded sites.

[5] Juga plicifera serves as an intermediate host for Nanophyetus salmincola.

[1] Juga plicifera is assessed as a vulnerable species in Oregon by NatureServe.