S.No.

Name

Time period

Height

Features

1.

Eiohippus

52million years ago

2ft

Premolars simpler than molars,

The forelimbs had developed five toes,

feet padded like a dog

2.

Mesohippus

40 million years ago

More than 2 feet

walked on three toes on each of its front and hind feet,

Face, snout and neck slightly longer

3.

Merychippus

Mesocene period

-

an effective grazer and runner, wider molars,

The hind legs, were relatively short, had side toes equipped with small hooves,

4.

Pliohippus

12 million years ago

Very similar to modern day horse

had two long extra toes on both sides of the hoof,

5.

Equus

5.6 million years ago

4.5-6ft

Modern day horse,

Only 1 toe on each foot,

24 teeth for chewing and grinding.