Patera clenchi (syn. Mesodon clenchi)[1] is a species of land snail in the family Polygyridae. It is endemic to Arkansas in the United States.[2] Its common names include Calico Rock oval,[2] [3] Clench's middle-toothed land snail, and Mission Creek Oregonian.[1]
The snail occurs in leaf litter in rocky cliff and rockslide habitat.[1] It is threatened by habitat disturbance.[1]
The species was named for the American malacologist William J. Clench.