Pimelodella is a large, widespread genus of small to medium South American catfish in the family Heptapteridae, the three-barbeled or bumblebee catfish family. The atlas covers 2 species, ranging 3–7 in, and the genus as a whole is spread across an unusually broad swath of the continent - the brief's countries span Brazil, Argentina, Colombia, French Guiana, Guyana, Peru, Suriname, and Venezuela. Like other heptapterids, Pimelodella species have an elongated, scaleless body, a flattened head, and long sensory barbels used to locate food on or near the substrate, mostly at night.
Some Pimelodella species turn up in the aquarium trade as undemanding scavenger-type catfish for community tanks, valued more for utility than for colour, though the genus overall is better known from ichthyological surveys than from hobbyist keeping. Pimelodella gracilis, the graceful pimelodella, is among the more frequently documented species. Conservation data are uneven across the genus - one of the atlas's two species is Least Concern and the other has not yet been formally evaluated - which fits a widely distributed group that has drawn more taxonomic than conservation attention.