Taxonomy
In 2004, C. P. Groves and C. H. Bell investigated the taxonomy of the zebras (genus Equus, subgenus Hippotigris). They concluded that the Cape mountain zebra (Equus zebra zebra) and Hartmann's mountain zebra (Equus zebra hartmannea) are distinct, and suggested that the two would be better classified as separate species, Equus zebra and Equus hartmannae.
However, in a sexual genetic study that included 295 mountain zebra specimens, Moodley and Harley (2005) found no genetic evidence to regard the two mountain zebra taxa as anything more than different populations of a single species. They concluded that the Cape mountain zebra and Hartmann's mountain zebra should remain as subspecies.
The third edition of Mammal Species of the World (2005) lists the mountain zebra as a single species (Equus zebra) with two subspecies.
Read more about this topic: Mountain Zebra