| Reference no. | Description | Year | Name Used | Page |
|---|---|---|---|---|
| 80507 | Dunz, A.R. and U.K. Schliewen, 2009. Description of two new species of Nannocharax Günther, 1867 (Teleostei: Characiformes: Distichodontidae) from the Cross River, Cameroon. Zootaxa 2028:1-19. | 2009 | Nannocharax usongo | 10;fig. |
| 95523 | Jerep, F.C., R.P. Vari and E. Vreven, 2014. Nannocharax dageti, a new distichodontid from the Democratic Republic of the Congo and Zambia (Teleostei: Characiformes). Ichthyol. Explor. Freshwat. 24(4):361-369. | 2014 | Nannocharax usongo | 368 |
| 96084 | Jerep, F.C. and R.P. Vari, 2014. New species of Nannocharax (Characiformes: Distichontidae) from the Northwestern Congo River Basin, with appraisal of Hemigrammocharax. Copeia 2014(1):44-49. | 2014 | Nannocharax usongo | 49 |
| 105471 | eElurikkus, 2015. eElurikkus koondab ühte portaali Eesti eluslooduse andmed. http://elurikkus.ut.ee/ | 2015 | Nannocharax usongo | --> |
| 128868 | Beolens, B., M. Grayson and M. Watkins, 2023. Eponym dictionary of Fishes. Dunbeath, Caithness (Scotland, UK): Whittles Publishing Limited, 1300 p. | 2023 | Nannocharax usongo | 1347 |