Figure 4
From: Evolution of Old World Equus and origin of the zebra-ass clade
Comparisons of skulls, ventral and lateral views: E. simplicidens (USNM12573 and USNM12542, (a–d), E. stenonis (NHML20.163360 and IGF560 (e–h), E. koobiforensis (KNM-ER1284, i-j) and E. grevyi (USNM163228 k-l). Scale bar 10 cm.
