Rhadinoloricaria is a genus of whiptail catfish in the pleco family Loricariidae, placed in the slender-bodied subfamily Loricariinae alongside other whiptail plecos. Species occur across the western Amazon and Orinoco basins, with the atlas recording them from Ecuador, Peru, Colombia, Brazil, Venezuela, and Bolivia. True to the whiptail build, the body is greatly elongated and tapers to a slim tail, with a flattened underside suited to resting motionless on sand or leaf litter in slower, softer-substrate stretches of river rather than the fast rocky current favoured by many other loricariids.
The genus draws limited aquarium attention next to more familiar whiptails like Rineloricaria or Sturisoma; species such as Rhadinoloricaria macromystax do occasionally reach the trade simply labelled a whiptail catfish, valued for peaceful, algae- and detritus-grazing habits that suit a calm community tank. Most of the eleven species the atlas tracks, however, are known mainly from scientific collections rather than the hobby. Conservation data remain limited across the genus — several species are not evaluated or data deficient — consistent with a group of slender, camouflaged bottom-dwellers that are easy to overlook in survey work even where they are not especially rare.