Ochmacanthus is a genus of catfishes (order Siluriformes) of the familyTrichomycteridae. It includes five species, O. alternus, O. batrachostoma, O. flabelliferus, O. orinoco, and O. reinhardtii.1Ochmacanthus species are distributed in South America. O. alternus and O. orinoco originate from the Rio Negro and Orinoco River basins of Brazil and Venezuela. O. batrachstoma inhabits the Paraguay River basin in Brazil. O. flabelliferus lives in river drainages in Guyana and Venezuela. O. reinhardti is known from the Amazon River basin in Brazil and drainages in French Guyana.1Ochmacanthus species grow to about 3.2–5.0 centimetres (1.3–1.9 in) in length.23456