Alcalde

<em>Rineloricaria magdalenae</em> is a slender freshwater catfish of the family Loricariidae, native to South American river systems. Reaching a maximum recorded length of approximately 20 cm, this species belongs to a genus of whiptail loricariids recognized for their elongated, depressed body form and notably long caudal filaments in some members. The genus <em>Rineloricaria</em> is widespread across tropical South America, with individual species often occupying specific river drainages. Like other loricariids, <em>R. magdalenae</em> is a benthic species that uses its sucker mouth to graze on algal films and organic detritus adhering to submerged rocks and woody debris in shallow to moderately deep freshwater habitats. The bony scute armor is a defining feature of the family, providing structural protection in fast-current environments. Details of habitat and range for this species remain limited in the ichthyological literature. No formal conservation assessment has been published for this species. Its modest size and cryptic coloration are typical of whiptail catfishes adapted to life on river bottoms.