The Collaborative International Dictionary of English v.0.48:

Antidorcas \Antidorcas\ prop. n.
   A genus of mammals comprising the springbucks (or
   springboks). The main species is Antidorcas marsupialis the
   springbuck, of which there are three subspecies: the cape
   springbuck (marsupialis), the Kalahari springbuck (hofmeyri)
   and the Angolan springbuck (angolensis).

   Syn: genus Antidorcas.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

Antidorcas marsupialis
    n 1: a South African gazelle noted for springing lightly into
         the air [syn: springbok, springbuck, Antidorcas
         marsupialis, Antidorcas euchore]