Extinct species of antelope
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Beatragus antiquus, the ancient hirola, is an extinct species of alcelaphine antelope that lived in Africa during the Plio-Pleistocene.
Discovery.
"Beatragus antiquus" was first described by Louis Leakey in 1965 from material discovered at the Olduvai Gorge (Beds I and II) in Tanzania. Other remains dated slightly earlier have also been found in the Omo valley and possibly at Elandsfontein in South Africa.
Description.
The ancient hirola was larger than the modern day hirola, and the two together may represent a chronospecies. Other differences with the hirola include horn cores diverging immediately from their bases, a lessening of distal divergence, more upright insertions in side view and wider and more convex frontals of the horn cores.
Paleoecology.
It lived in vast savannas alongside other alcelaphine antelopes, such as a small species of "Damaliscus" and "Parmularius". The ancient hirola probably declined as a result of diminished habitat preferences, and the modern species, with its smaller size and less energy demands, eventually evolved to cope with the new ecologically impoverished landscape.
References.
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