Gomon, Janet R, Taylor, William Ralph, J.L.B. Smith Institute of Ichthyology. J.L.B. Smith Institute of Ichthyology; 1982. Plotonus nkunga, a new species of catfish from South Africa, with a redescription of Plotosus limbatus Valenciennes and key to the species of Plotosus (Siluriformes: Plotosidae).