The first group, or Tragelaphinae, is represented by the African elands (Taurotragus), bongo (Boocercus), kudus (Strepsiceros) and bushbucks or harnessed antelopes (Tragelaphus), and the Indian nilgai (Boselaphus).
The harnessed antelopes, or bushbucks, are closely allied to the kudus, from which they chiefly differ by the spiral formed by the horns generally having fewer turns.
Elands and kudus appear to have been represented in India during the Pliocene; the European Palaeoreas of the same age seems to be intermediate between the two, while Protragelaphus is evidently another European representative of the group. Helicophora is another spiral-horned European Pliocene antelope, but of somewhat doubtful affinity; the same being the case with the large Criotherium of the Samos Pliocene, in which the short horns are curiously twisted.
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