Třída: Chondrichthyes - paryby
Řád: Myliobatiformes -
Čeleď: Dasyatidae - trnuchovití

Synonyma: Trygon ukpam (Smith, 1863); Hemitrygon ukpam Smith, 1863; Dasyatis centroura (non Mitchill, 1915).

Reference: 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. v. 2 (1859): 64-69.