Suckermouth catfish may refer to: Any species of armored catfish (family Loricariidae), most notably: Hypostomus plecostomus, and Hypostomus punctatus, two species of armored catfish popular with aquarists Any similar species marketed under the name "plecostomus" or "pleco" Sailfin suckermouth, usually Pterygoplichthys gibbiceps