Isorineloricaria is a genus of armored suckermouth catfish in family Loricariidae, native to river systems of Colombia, Venezuela, and Ecuador on the Caribbean and Orinoco side of northern South America. The 4 species in the atlas span an unusually wide size range for the genus, from roughly 8.5 in up to 22 in, putting some of the larger species well beyond the small ornamental plecos most aquarists know. Like other loricariids, they carry rows of bony lateral plates and a ventral sucker-mouth used to grip rock and driftwood in flowing water while rasping algae, biofilm, and detritus from the surface.
The genus is more a subject for specialist pleco keepers and regional ichthyology than the mainstream trade; the Zucchini Pleco (Isorineloricaria spinosissima), named for the pale, striped pattern over its body, is the species most likely to appear under a trade name, while I. acuarius, I. tenuicauda, and I. villarsi are rarely offered and poorly documented in aquarium literature. Given the larger-bodied species' size, they are suited only to spacious, current-fed tanks with driftwood to graze and gnaw, a maintenance need shared with most large loricariids. Conservation data are thin - 3 species are listed Least Concern and 1 is Not Evaluated, so specific population trends are not well established.