Fossil history of horse, Biology

Assignment Help:

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


Related Discussions:- Fossil history of horse

Physical stress - temperature, Physical Stress - Temperature We are mo...

Physical Stress - Temperature We are most familiar with the plants and other organisms that live at temperatures close to the temperature range in which we are adapted to live

Specific organization, Specific Organization The body of all living th...

Specific Organization The body of all living things, no matter how different in size or appearance, is composed of cells. Viruses are of course an exception. The study of cell

Describe congenital pulmonary stenosis, Describe Congenital Pulmonary Steno...

Describe Congenital Pulmonary Stenosis? The murmur present since birth. PS may be valvular, sub-valvular, or supravalvular. An obstruction may occur within the RV cavity by an

Determine which is most stable, Hydrogen ( H) has 1 electron, carbond ( c) ...

Hydrogen ( H) has 1 electron, carbond ( c) has 6 electrons ; oxygen ( O) has electrons, Nitrogen ( n) HAS 7 electrons. Use the octet rule to determine which of the following is mos

Reason''s for mendel''s success, REASON'S FOR MENDEL'S SUCCESS 1.      ...

REASON'S FOR MENDEL'S SUCCESS 1.         Mendel selected only pure breeding varieties of pea ( Pisum sativum ) for his experiments. 2.         Mendel took only those traits

Explain the distant osteogenesis, Explain the Distant Osteogenesis In t...

Explain the Distant Osteogenesis In this an extracellular matrix establishes the implant surface contact. The osteogenic cells line the host bone surface. The blood supply to t

Homozygous and weterozygous, Homozygous and Weterozygous In an individu...

Homozygous and Weterozygous In an individual two identical alleles may exist [or a given character and, hence, the individual is referred to as Homozygous (e.g. AA and aa). If

Explain neurologic disease, Explain Neurologic disease For patients wit...

Explain Neurologic disease For patients with facial nerve palsy alone, oral doxycycline or amoxicillin may be effective. Patients with other neurologic involvement, such as men

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd