Pseudacanthicus histrix should not be confused with Acanthicus hystrix.
Pseudacanthicus histrix is a large species of armored catfish endemic to Brazil where it occurs in the Rio Negro and lower Amazon basins. This species grows to a total length of 90abbr=onNaNabbr=on. P. histrix has incredibly elongated odontodes that form a brush on the anterior margin of the pectoral fin spine in breeding males; however, sexual dimorphism has not been reported for the other Pseudacanthicus species.[1]