Niobichthys ferrarisi is the only species of the monotypic genus Niobichthys of loricariid catfish (order Siluriformes). N. ferrarisi is classified in the tribe Hypoptopomatini within the subfamily Hypoptopomatinae. This fish reaches a length of 7.0 centimetres (2.8 in) SL. This species is endemic to Venezuela and occurs in the upper Baria River and the Rio Negro basin.