Arab Today, arab today jawbone fossil in ethiopia sheds light on human origins
Last Updated : GMT 07:27:18
Arab Today, arab today
Arab Today, arab today

Ancestors were living in open grassland environments

Jawbone fossil in Ethiopia sheds light on human origins

Arab Today, arab today

Arab Today, arab today Jawbone fossil in Ethiopia sheds light on human origins

Close up view of the mandible just steps from where it was sighted by Chalachew Seyoum
Miami - Arab Today

A piece of jawbone with teeth attached, uncovered in Ethiopia, is the earliest known fossil of the genus Homo, to which humans belong, researchers said Wednesday.
The discovery suggests that humankind's ancestors were living in what is now the Ledi-Geraru research area of Afar Regional State, Ethiopia, in open grassland environments, near lakes, rivers, and active volcanoes, about 2.8 million years ago, or 400,000 years earlier than previously thought.
"It is the first fossil we have on the branch that leads toward us," said Brian Villmoare, assistant professor at the University of Nevada, lead author of the study in the journal Science.
The jawbone, known as LD 350-1, is the lower left side of a mandible with five teeth, and was found in fine sediment near the surface of the research site in 2013.
The fossil has not yet been assigned to a particular species, but its slim molars and dental arch proportions indicate an advancement that is not seen in the more ape-like Australopithecus afarensis, dating just a few hundred thousand years earlier.
Experts described the fossil as a very early representative of the species that led to modern humans, though not a direct ancestor of our particular species, known as homo sapiens.
Researchers are particularly intrigued because the fossil dates to a period when few such artifacts have been found, and sheds light on the time when early hominids diverged, as the ancestors of homo sapiens split from the more ape-like australopithecus, which walked upright but had smaller brains.
"The fossil record in east Africa between two and three million years ago is very thin and there are relatively few fossils that can inform us about the origins of the genus homo," said Villmoare.
"However this is one of the most interesting periods in human evolution."
- Link to 'Lucy' -
The last known fossil of most recent member of Australopithecus afarensis ("Lucy") comes from the nearby Ethiopian site of Hadar and is about 3.2 million years old.
Meanwhile, the oldest known Homo fossil was, until now, believed to be about 2.3 or 2.4 million years old.
The refinement seen in the new fossil "suggests that the transition itself was relatively rapid," said Villmoare.
"Of course this specimen raises many more questions than answers, and those questions will only be resolved by further fieldwork."
With few trees around, and a climate that was likely hot and dry, this creature had likely adapted in ways that were different than Australopithecus.
"This early homo could live in this fairly extreme habitat and that apparently Lucy's species could not," said Kaye Reed, a co-author on the paper from Arizona State University.
The journal Science's deputy editor Andrew Sugden described the findings as opening a "major new chapter in the story of human evolution in Africa, which expands our understanding not only of human origins, but also of the environments in which our ancestors emerged."
A related paper in the journal Nature described how state-of-the-art computer reconstruction of the pieces of a Homo habilis fossil -- declared in 1964 to be the earliest known member of our human evolutionary lineage  -- shows that this so-called Handy man's jaw was actually more primitive than previously thought.
The fossil Olduvai Hominid 7, or OH 7, included a lower jaw, parts of a braincase and hand bones from an individual found in 1.8 million-year-old sediment in Tanzania.
Researchers used computed tomography (CT) and 3D imaging technology to digitize and reassemble the bone fragments on a computer screen.
The result was a lower jaw that was more narrow, and more like the older species Australopithecus afarensis, than the more closely related Homo erectus.
The braincase of the Handy man however was larger than previously estimated and looked similar to that seen in Homo erectus.
Researchers now understand that were vast differences in the jaws of three different early Homo species that lived between 2.1 and 1.6 million years ago: Homo habilis, Homo erectus and Homo rudolfensis.
"The Ledi jaw helps narrow the evolutionary gap between  Australopithecus and early  Homo," said William Kimbel, director of Arizona State University's Institute of Human Origins.
"It's an excellent case of a transitional fossil in a critical time period in human evolution."
Source: AFP

 

arabstoday
arabstoday

Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

Arab Today, arab today jawbone fossil in ethiopia sheds light on human origins Arab Today, arab today jawbone fossil in ethiopia sheds light on human origins

 



Name *

E-mail *

Comment Title*

Comment *

: Characters Left

Mandatory *

Terms of use

Publishing Terms: Not to offend the author, or to persons or sanctities or attacking religions or divine self. And stay away from sectarian and racial incitement and insults.

I agree with the Terms of Use

Security Code*

Arab Today, arab today jawbone fossil in ethiopia sheds light on human origins Arab Today, arab today jawbone fossil in ethiopia sheds light on human origins

 



Arab Today, arab today
Arab Today, arab today Youssra depended on colored foam

GMT 16:53 2017 Tuesday ,05 September

Youssra depended on colored foam
Arab Today, arab today EasyJet, Lufthansa among seven to bid

GMT 06:49 2017 Tuesday ,17 October

EasyJet, Lufthansa among seven to bid
Arab Today, arab today Etiquette expert underlines importance of gifts

GMT 17:52 2017 Sunday ,03 September

Etiquette expert underlines importance of gifts
Arab Today, arab today Fighters celebrate Raqa victory

GMT 06:07 2017 Wednesday ,18 October

Fighters celebrate Raqa victory
Arab Today, arab today Iran's Facebook shuts down

GMT 23:50 2017 Monday ,16 October

Iran's Facebook shuts down
Arab Today, arab today
Arab Today, arab today
Arab Today, arab today Sidem reveals plan to improve education

GMT 15:52 2017 Friday ,06 October

Sidem reveals plan to improve education
Arab Today, arab today British actress becomes fifth woman

GMT 18:15 2017 Monday ,16 October

British actress becomes fifth woman
Arab Today, arab today Three killed, 360,000 without power

GMT 05:11 2017 Tuesday ,17 October

Three killed, 360,000 without power
Arab Today, arab today The history of solar eclipses

GMT 05:16 2017 Sunday ,20 August

The history of solar eclipses
Arab Today, arab today Mercedes says recalls 400,000 UK cars

GMT 06:56 2017 Tuesday ,17 October

Mercedes says recalls 400,000 UK cars
Arab Today, arab today Britain's Vauxhall to cut 400 jobs

GMT 10:53 2017 Sunday ,15 October

Britain's Vauxhall to cut 400 jobs
Arab Today, arab today Anoshka happy for reactions to her talk show

GMT 12:33 2017 Friday ,13 October

Anoshka happy for reactions to her talk show
Arab Today, arab today India to close colonial-era military farms

GMT 18:49 2017 Monday ,16 October

India to close colonial-era military farms

GMT 10:55 2017 Thursday ,12 October

Safaa Sultan happy for “Love School”

GMT 10:37 2017 Thursday ,12 October

Cara Delevingne accuses Weinstein

GMT 16:53 2017 Saturday ,02 September

Mai importance of gifts during Eid Al-Adha

GMT 12:02 2017 Saturday ,14 October

Conservation cutbacks put Brazil's

GMT 10:46 2017 Saturday ,05 August

Nanis reveals simple ideas for home renovation

GMT 23:42 2017 Monday ,16 October

Better Marriages Make

GMT 07:02 2017 Sunday ,15 October

German minister sparks uproar

GMT 17:12 2017 Monday ,07 August

Al-Shawaifi reveals secrets of total solar eclipse

GMT 03:59 2017 Sunday ,15 October

US mobile carriers Sprint, T-Mobile to merge

GMT 11:37 2017 Saturday ,12 August

Fashion designer reveals her new collection
Arab Today, arab today
Arab Today, arab today
 
 Arab Today Facebook,arab today facebook  Arab Today Twitter,arab today twitter Arab Today Rss,arab today rss  Arab Today Youtube,arab today youtube  Arab Today Youtube,arab today youtube
arabstoday arabstoday arabstoday arabstoday
arabstoday arabstoday arabstoday
arabstoday
بناية النخيل - رأس النبع _ خلف السفارة الفرنسية _بيروت - لبنان
arabstoday, Arabstoday, Arabstoday