Belongs within: Bovidae.
The Tragelaphini, spiral-horned antelopes, are an African group of medium- to large-sized, deep-bodied antelopes with long, narrow faces. Males have long, straight, corkscrewing horns; females are hornless or have more slender horns than males (Underwood & Hall 1984).
<==Tragelaphini [Strepsicerotini, Tragelaphinae]
|--Pontoceros Vereshagin, Alexejeva et al. 1971C-B07
| `--P. ambiguus Vereshagin, Alexejeva et al. 1971C-B07
| |--P. a. ambiguusC-B07
| `--P. a. mediterraneus Kostopoulos 1996C-B07
|--TaurotragusG78
| |--T. arkelli Leakey 1965G78
| |--T. derbianusUH84
| | |--T. d. derbianusBP87
| | |--T. d. congolanus Rothschild 1913R13
| | `--T. d. gigasBP87
| `--T. oryxG78
`--TragelaphusFS15 [incl. BoocercusG78, StrepsicerosG78]
| i. s.: T. delamerei Pocock 1900P00
| T. gratusH04
| T. kudu [incl. Antilope strepsiceros]H04
| T. kyaloaeLF95
| T. nakuae Arambourg 1941G78
|--T. angasiiFS15 [=Strepsiceros angasiWC56]
`--+--T. derbianusFS15
`--+--+--T. oryxFS15
| `--T. strepsicerosFS15 [=Strepsiceros strepsicerosWC56]
| |--T. s. strepsicerosG78
| |--‘Strepsiceros’ s. choraM71
| |--T. s. grandis Leakey 1965G78
| `--T. s. maryanus Leakey 1965G78
`--+--T. buxtoni Dietrich 1942FS15, G78
`--+--+--T. eurycerusFS15
| `--+--T. gaudryi (Thomas 1884)G78
| `--T. imberbisFS15 [=Strepsiceros imberbisM71]
`--+--T. spekiiFS15
| |--T. s. spekiiG78
| `--T. s. stromeri Schwarz 1932G78
`--+--T. pricei (Wells & Cooke 1956) [=Cephalophus pricei]G78
`--T. scriptusFS15 [incl. Antilope maculataH04]
|--T. s. scriptusP00
|--T. s. deculaP00
|--T. s. dianaeM71
|--T. s. fasciatus Pocock 1900P00
|--T. s. menelikiM71
|--T. s. ornatus Pocock 1900P00
|--T. s. roualeyneiP00
`--T. s. sylvaticusP00
Inorganic: Tragelaphus spetei minilorientalus Okamura 1987O87
*Type species of generic name indicated
References
[BP87] Burton, J. A., & B. Pearson. 1987. Collins Guide to the Rare Mammals of the World. Collins: London.
[C-B07] Crégut-Bonnoure, E. 2007. Apport des Caprinae et Antilopinae (Mammalia, Bovidae) à la biostratigraphie du Pliocène terminal et du Pléistocène d’Europe. Quaternaire 18 (1): 73–97.
[FS15] Faurby, S., & J.-C. Svenning. 2015. A species-level phylogeny of all extant and late Quaternary extinct mammals using a novel heuristic-hierarchical Bayesian approach. Molecular Phylogenetics and Evolution 84: 14–26.
[G78] Gentry, A. W. 1978. Bovidae. In: Maglio, V. J., & H. B. S. Cooke (eds) Evolution of African Mammals pp. 540–572. Harvard University Press: Cambridge (Massachusetts).
[H04] Haeckel, E. 1899–1904. Kunstformen der Natur. Bibliographisches Institut: Leipzig und Wien.
[LF95] Leakey, M. G., C. S. Feibel, I. McDougall & A. Walker. 1995. New four-million-year-old hominid species from Kanapoi and Allia Bay, Kenya. Nature 376: 565–571.
[M71] Menchinelli, R. 1971. Proboscidati, perissodattili ed artiodattili del Museo Civico di Storia Naturale di Genova. Annali del Museo Civico di Storia Naturale “Giacomo Doria” 78: 189–216.
[O87] Okamura, C. 1987. New facts: Homo and all Vertebrata were born simultaneously in the former Paleozoic in Japan. Original Report of the Okamura Fossil Laboratory 15: 347–573.
[P00] Pocock, R. I. 1900. Descriptions of three new forms of Tragelaphus. Annals and Magazine of Natural History, series 7, 5: 94–96.
[R13] Rothschild, W. 1913. Descriptions of some new forms of antelope, with notes. Annals and Magazine of Natural History, series 8, 12: 574–576.
[UH84] Underwood, R., & S. J. G. Hall. 1984. Wild cattle and spiral-horned antelopes. In: Macdonald, D. (ed.) All the World’s Animals: Hoofed Mammals pp. 104–113. Torstar Books: New York.
[WC56] Wells, L. H., & H. B. S. Cooke. 1956. Fossil Bovidae from the Limeworks Quarry, Makapansgat, Potgietersrus. Palaeontologia Africana 4: 1–55.