Class Notes (837,611)
Canada (510,370)
Anthropology (1,602)
ANTC17H3 (22)
Lecture

ANTC17 Feb 6 lecture.docx

5 Pages
89 Views
Unlock Document

Department
Anthropology
Course
ANTC17H3
Professor
Mary Silcox
Semester
Winter

Description
Feb 6 lecture - Ar. kadabba o multiple sites between two time periods o volcanic material to do dating - Ar. Ramidus o Well dated to 4.4 mya o Material described by tim white - Ethiopia o Eastern/northern end of Africa o Star sites ar. Kadabba material o Very dry and lots of erosion - Ar. Kadabba o Older of two species o 2004 -> added some more teeth o has a fairly primitive looking canine and premolar arrangement o modern apes sharpen or hone their canine against their front most premolar o ardipithicus had a honing complex o sahelanthropos didn’t have a honing complex  not sure what means  sahelanthropus is older o not much their to make an argument about bipedality o missing front of tibia, etc o have proximal toe phalanx ( slide 7)  proximal attaches toe to foot  determines what the joint relationship is o Human and ape feet designed differently  Ape -> grasping o Foot is dorsiflexed when you’re taking a step  If you’re an ape, plantarflexion is more important o Toe bone seems to look like “homo” o Relationship of being bipedal is not as one to one as one would like - Ardipithecus Ramidus o 110 specimens from a min of 36 ind o slide 9 -> “ardy” o 3 ft 11 inches tall o 110 lbs o incredible fragility o took 15 years to get adequately prepared o heavily flattened o was it bipedal?  Pelvis  For humans -> shape of illium is different  For ar. Ramidus illium seems short and broad like human  Gludeal muscles sit in back and act as extensors -> animals  Has laterally oriented ilia  Seems to be stable biped  Pelvis seems very human like  When in upright position, hamstring muscles have beter pull for human  Ramidus looks like a chimp with respect to this aspect  Would not have been effective when pulling leg back as a modern human o Would have been such an effective biped when talking about the pelvis o Big toe is abducted -> ape  Oriented more like our thumb than our big toe -> ardipithecus  Suggests animal that spent time in the trees  Chimps have more flexible midfoot  We can’t fold our foot around a branch  Doesn’t f’n like a human foot o Foot more rigid than an ape o Hand is significantly different than chimps  Wrist very rigid -> chimps  Ardi. -> carpal bones much more flexible  Thing that was compared is the “capitate”  Angle to the bone  Ardipithecus didn’t knuckle walk but supported weight on palm like a monkey o Body proportions different than chimps  Reconstructed intermembral index  (Length of humerus + length of radius) /( femur + tibia)  Pan = 105  Homo ~ 70  Ardi. = 90  Wouldn’ t have been to take long steps  Didn’t have long forelimbs like the chimps  Unexpected o Head is in poor shape  Needed to be ct scanned and reconstructed  Cranial capacity -> female chimp o Teeth  Canine larger than modern human  Evidence that there wasn’t a lot of dimorphism in the canines  Humans very dimorphic  Very little variability in the size of the canine -> much less than humans and chimps  Thickness of enamel – red is thick and blue is thin  Look at slide 25  Thick enamel helps with eating abrasive food items  Australopithecus have big back teeth  For a small body size -> lucy has big molars o Difference from chimpanzee o Environment -> aramis in Ethiopia o Def
More Less

Related notes for ANTC17H3

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit