Isbrueckerichthys duseni is a species of armored catfish endemic to Brazil where it occurs in the Ribeira de Iguape River basin. This species grows to a length of SL. The fish is named in honor of Karl Hjalmar Dusén (1855-1926) a Swedish botanist and explorer, who collected the type specimen. References Loricariidae Taxa named by Alípio de Miranda-Ribeiro Catfish of South America Freshwater fish of Brazil Endemic fauna of Brazil Fish described in 1907