[1] Equus [2] All modern equines: rigid spine; long neck, nose and legs; fused leg bones with no rotation; flexible muzzle; deep jawed [0] 
Genus
K i n g d o m
P h y l u m
S u b - P h y l u m
C l a s s
O r d e r
F a m i l y
G e n u s
S p e c i e s
S u b - S p e c i e s