Atopochilus pachychilus is a species of upside-down catfish endemic to the Democratic Republic of the Congo where it occurs in the Lubilonji River in the vicinity of Kanda Kanda. This species grows to a length of TL. References pachychilus Freshwater fish of Africa Fish of the Democratic Republic of the Congo Endemic fauna of the Democratic Republic of the Congo Taxa named by Jacques Pellegrin Fish described in 1924