[Kingdom] Animalia Linnaeus, 1758 - animals
Grade Enterozoa
Grade Cœlomata
Phylum Vertebrata (Lamarck, 1801)
Branch Craniata Linnaeus, 1758
Grade Gnathostoma
Subgrade Pentadactyla lipobranchia
Branch Amphicondyla [monotypic]
Class Mammalia Linnaeus, 1758 - mammals
Grade Placentalia Owen, 1837
see Cohort Placentalia Owen, 1837
Subclass Ungulata (Linnaeus, 1766)
Order Perissodactyla Owen, 1848 - odd-toed ungulates
Genus Equus Linnaeus, 1758 - horses, zebras, and asses