Uncancylus concentricus is a species of small, freshwater, air-breathing limpet, an aquatic pulmonate gastropod mollusc in the family Planorbidae, the ram's horn snails and their allies.

U. concentricus occurs in Costa Rica, Puerto Rico, Colombia, Argentina, Chile, Brazil, Paraguay and Uruguay.

[3][4] U. concentricus has a high, thin, transparent shell, with growth lines and radial ribs,[4][5] which may in certain cases appear somewhat fuzzy, especially when it inhabits torrential environments.

[1] It may also be found in stagnant waters, lakes or ponds where a surface that allows adhesion exists; no specimens were observed on silty or sandy substrates.

Dos Santos (2003) has associated the species with environments with little current, not polluted, with meso- to oligotrophic features.