Equus (genus) 54 million years ago (Mya). These animals had three toes on the hind feet and four on the front feet with small hooves in place of claws, but also had soft pads.<ref name="doi10.1126/science.1105458"></ref> Equids developed into larger, three-toed animals (e.g. "Mesohippus") during the Oligocene and Miocene. From there, the side toes became progressively smaller through the Pleistocene until the emergence of the single-toed "Equus". The genus "Equus", which includes all extant equines, is believed to have evolved from "Dinohippus", via the intermediate form "Plesippus". One of the oldest species is "Equus simplicidens", described as zebra-like with a donkey-like head shape.
Hyundai Equus only Tau 4.6 MPi for the 2011 model (390PS) engine. The Tau 5.0 GDi was from 2012 forward. All models included ZF 6-speed automatic transmission with SHIFTRONIC manual control. 2012 model vehicles include 8-speed automatic transmission, introduction of GDI engines. It was also revealed that the Hyundai Equus will be receiving a 5.0L V8 with and . This engine will be an option for the Equus after January 2011. This engine will also be placed in the facelifted 2012 Hyundai Genesis. Korean models went on sale in 2012. It is a limited (3 units) version of 2013 Hyundai Equus limousine