Subspecies and Distribution. P. m. maxwelli C.H. Smith, 1827 — Senegal and Gambia to E Ghana (likely limited to the E by the Volta River). P.m. danei Hinton, 1920 — Yatward and Sherbro Is, Sierra Leone. in Bovidae

Subspecies and Distribution. P. m. maxwelli C.H. Smith, 1827 — Senegal and Gambia to E Ghana (likely limited to the E by the Volta River). P.m. danei Hinton, 1920 — Yatward and Sherbro Is, Sierra Leone.Published as part of Don E. Wilson & Russell A. Mittermeier, 2011, Bovidae, pp. 444-779 in Handbook of the Mammals of the World – Volume 2 Hoofed Mammals, Barcelona :Lynx Edicions on page 708, DOI: 10.5281/zenodo.651248