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Updated: May 17, 2025
Two possibilities are open to choice: Mazama may be supposed to have descended from the group to which Blastomeryx belonged, this being a late Miocene genus from Nebraska, with cervine molars, but otherwise much like Cosoryx, which we have seen to be a possible ancestor of the prong-horn; or we may prefer to believe that the differentiation took place earlier in Europe or Asia, from ancestors common to both.
But, on the whole, the latter hypothesis presents fewer difficulties and is probably the correct one; in which case two migrations must have taken place, an earlier one of the generalized type to which Blastomeryx and Cosoryx belonged, and a later one of the direct ancestor of Mazama.
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