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 9.88 centimetres (3.89 in) SL.

The fish is named in honor of Karl Hjalmar Dusén (1855-1926) a Swedish botanist and explorer, who collected the type specimen.

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