A comparative morphological study of the sixth and seventh spinous processes of the cervical vertebrae in extinct and extant species of Equus.
The lateral profile of the 6th and 7th cervical spinous processes (CSPs) were examined in four extant species of Equus (n=33); E.caballus (n=26), E.przewalskii (n=3), E.quagga boehmi (n=1), E.asinus (n=3) and compared to pre-domesticated Equus specimens (n=66) representing three known species: E.occidentalis (n=56), E.mosbachensis (n=2), E.curvedin