Primate heritage, Biology

Table provides you the classification of the living primates. The primate fossil history dates back to 60 million years i.e. to Paleocene times, more specifically to the cretaceous age, The fossils of mammals of this period, their teeth, jaws and skulls bear affinities with Lemuroids.

In all these fossils apart from the structure of the molar teeth which is of primate character, there is a tendency in the skulls towards the expansion of the brain. Further there is a shortening of the face in these skulls, and the eyes which were initially laterally placed get a frontal

position. Also, there is a relative increase in the size of the cranium to accommodate a larger volume of brain.
The Lemurs found in the fossil records of the Eocene times were comparable to modern lemurs except that their brain was smaller and teeth specialisations were not found. Eocene times also showed tarsiers, the fossils of which showed primitive skulls, brain and limbs, significantly the number of teeth were reduced from 44 to 32, which is an anthropoid characteristic. Besides the numbers, the structure of the teeth with bicuspid premolars and tricuspid molars were typically anthropoid an in nature. Primates were abundant in North America and Europe until the end of Eocene and then disappeared completely.

There is a poor fossil record of primates in Oligocene times i.e. some 30 million years ago. In Egypt, in a place called Fayum a considerable diversity of primate remains were obtained. These primates belong to the genera Aegyptopithecus, Apidium, Aelopithecus and Oligopithecus. These fossils were clearly distinct from lemuroid fossils of Eocene times. All of them were small mammals and anthropoid in their characters. A nearly complete fossil of the skull jaws and other skeletal parts were obtained for Aegyptopithecus. The skeleton resembled that of a tree dweller, possessed a tail and was not a brachiator. The fossil suggested that the animal had along .snout, small bony eye sockets, sexual dimorphism of the canine and its teeth resembled those of apes. Possibly this animal was an ancestor of gibbons.

Posted Date: 4/5/2013 3:30:43 AM | Location : United States







Related Discussions:- Primate heritage, Assignment Help, Ask Question on Primate heritage, Get Answer, Expert's Help, Primate heritage Discussions

Write discussion on Primate heritage
Your posts are moderated
Related Questions
Composition - Culture Medium A standard plant tissue culture medium (Basal medium) contains all the essential macro elements (Carbon, hydrogen, oxygen nitrogen, phosphorus, su

Explain the Numerical Taxonomy? Numerical methods in taxonomy are not new. Simple statistical methods like standard deviations, t-tests and chi-squared have been used for sever

Q. Incineration Treatment technologies for health-care waste? It used to be the method of choice for most hazardous health-care wastes and is still widely used. It is a high te

Explain Taxonomy - Modern Trends in Animal Taxonomy The term taxonomy which is derived from the Greek word 'taxis', meaning order or arrangement and nbmos ' meaning law, deals

Explain various chemical formulas? Chemical Formulas A molecule can be represented in any of three ways: its chemical formula, structural formula, or Lewis diagram. A chemic

notochotr is absent in the group ...........

Formation of Notochord and Somites The formation of notochord and somites from the transplanted dorsal lip was supposed; these are normally derived from cells of the dorsal li

What are some diseases characterized by progressive loss of the axonal myelin sheath? Multiple sclerosis is a severe disease caused by progressive destruction of the myelin she

Q. Are the veins or the arteries constituted of more muscle tissue? How different are the walls of these two kinds of blood vessels? The arterial system has thicker muscle wall

what two gases are released by animals during the process of cellular respiration