Fossil history of horse, Biology

Evolution of Horse -

Credit to Prof. C. Marsh (1879) of Yale University for complete work.

 

S.No

 

Fossil/Genus

 

Period

 

Character

1

Hyrocotherium or Eohippus/Dawn Horse

(40 cm)

N. America

Eocene

 

60 million years

Fox/small dog size short head and neck, molars were short

 

The forefeet were with four complete fingers (2, 3, 4 and 5)

 

and one splint of first fingers and hindlimbs with three functional toes (2, 3, and 4) and 1 and 5 toes are splint.

2

Mesohippus

 

(60 cm)

Oligocene

 

40 million years

Modem sheep size, forelimbs had three fingers and one splint of fifth finger and hindlimbs possessed three toes, but

the middle one was longer.

3

Merychippus / (Miohippus)

Ruminating horse

 

(100 em)

Miocene

 

25 million years

Size of ass, longer neck, the middle finger and toe being longer then others and supported entire body length.

4

Pliohippus / Toes horse (120 cm)

Pliocene

10 million years

Size slightly large than ass, Each fore and hindlimbs had one complete finger and toe and two splints hidden beneath

skin.

5

Equus

 

Modem horse

(150 cm)

Pleistocene

 

1 million years

Long head and neck, each fore and hind limbs has one finger and one toe and two splints.

578_evolution of horse.png

Posted Date: 10/8/2012 9:15:40 AM | Location : United States







Related Discussions:- Fossil history of horse, Assignment Help, Ask Question on Fossil history of horse, Get Answer, Expert's Help, Fossil history of horse Discussions

Write discussion on Fossil history of horse
Your posts are moderated
Related Questions
Work Injuries Based On Type of Accidents Earlier we identified four kinds of injuries mainly based upon type of disability. This classification is needed for the purposes of c

Neuropsychological understanding of behavioural deficits Behaviour is an outcome of the interaction of the brain with the environment. A composite of multiple psychological pro


What are the hormones produced by the testicles and the ovaries? The testicles make androgenic hormones, the major of them being testosterone. The ovaries make estrogen and pro

Most of them happen on mucous membrane. Allergens enter the body by the process of inhalation or ingestion.

Define Regulation and Excretion of sodium and chloride? Renal excretion and retention of these elements is closely regulated. The total content of body sodium especially the co

Explain the Human Milk Composition and Infant Growth and Development? This sub-section deals with composition of human milk, compares human milk with cow's milk and why human m

Adverse Effects of Acyclovir By any route of administration, acyclovir is generally well tolerated. Gastrointestinal (GI) disturbances and headache can occur. Given IV, the dr

What is the epidermis..

NE R V OU S TISSUE The nervous tissue in general develops from the ectoderm of the embryo, but the microgliocytes. It does not have a matrix. The special properti