Rineloricaria uracantha is a species of freshwater ray-finned fish belonging to the family Loricariidae, the suckermouth armored catfishes, and the subfamily Loricariinae, the mailed catfishes.. This catfish occurs in Costa Rica and Panama. It is sometimes a member of genus Fonchiiichthys which has recently been considered to be a synonym of Rineloricaria and thus may be invalid. This species grows to a standard length of and is a facultative air breather.