Mesohippus, Miohippus, and Merychippus
are extinct horse species that date fifteen to thirty million years ago, spanning over three time periods in North America.
As for the miniature, it is suggested that they came into existence as a direct descendant of the prehistoric merychippus
and pliohippus equine evolutionary chain.
inflatus), Carpocyon robustus, Ischyrocyon gidleyi (= Pliocyon walkerae), Merychippus sp., Hypohippus sp., Cormohipparion (= Neohipparion) occidentale, Neohipparion affine (= whitneyi), Pseudhipparion (= Nannippus) gratus, Pliohippus pernix (= lullianus), Ustatochoerus sp., and Cosoryx sp.
Tabrum (1981) re-described the equids at the Mission Pit and assigned them to six taxa including Merychippus sp., Calippus sp., Protohippus sp., Pliohippus pernix (= lullianus), Pseudhipparion n.
indet., the bone-crushing dogs Tomarctus hippophaga and Cynarctoides acridens, the horse Merychippus
A fossil of Merychippus
(ruminant horse) was found at site D.
As the grasslands became a more dominant part of the landscape, the Merychippus
of 20 million BP had grown to 35 inches in height and its teeth were now adapted for grazing.
Merychippus. In the Miocene epoch, about 20 million years ago, a new type of horse appeared.
List the following ancestors of today's horse in order of their appearance on Earth: Pliohippus, Eohippus, Mesohippus, and Merychippus.