Chapter 10, Problem 1ER

Summary Introduction

To discuss: The two identical traits which emerged initially in pre-australopithecines and resembles significant attributes of the hominine evolutionary system.

Introduction:

The earliest hominines comes into existence during the changeover from an arboreal lifestyle to terrestrial lifestyle, due to this the fossils of these initial hominine species have selected anatomical features which reflect bipedality and few traits resembles arboreality. Over the time period of million years the traits of arboreal such as grasping foot vanished from fossil records.

Significant anatomical changes takes place in hominines consist the outstanding increase in robust city and size of the chewing machine. These changes vanish with extinction of frenzied robust australopithecines.

Explanation of Solution

The pre australopithecine fossils are limited and have quite fragmentary but provides significant information regarding the origins and earliest evolution of the hominine. The pre australopithecines have many primitive characteristics resembles human appearances, they represent initial identified ancestors of lineage to humans.

Sahelanthropustchandensis is the initial pre-australopithecine represented by skull and other fossil found in CA, this skull belongs to the primate with a small and primitive brain like that of apes. The cranial capacity uneven measure of brain volume is a major important quantitative traits with which anthropologists evaluate the humanness degree in individual fossil hominine. Orrorin tugenensis is a pre australopithecine species found in EA which exhibited some of initial evidence of bipedalism.