| Citation | Smith, J.A., 1863. Notice of the ukpam, a large species (probably new) of sting ray (Trygon, Cuv.), found in the Old Calabar River, Africa. Proc. R. Phys. Soc. Edinb. 2:64-69. |
| DOI / ISBN | |
| Paper URL | |
| Ref. No. | 97748 |
| Language | English |
| Usage | used in part |
| Comments | original description of Hemitrygon ukpam |
| Remarks | |
| Find this reference in | Google Scholar | Scirus | Species used from this reference |