Navigation Links
New research reveals how human ancestor walked, chewed, and moved
Date:4/11/2013

A team of scientists has pieced together how the hominid Australopithecus sediba (Au. sediba) walked, chewed, and moved nearly two million years ago. Their research, which appears in six papers in the latest issue of the journal Science, also shows that Au. sediba had a notable feature that differed from that of modern humansa functionally longer and more flexible lower back.

Together, the studies offer a comprehensive depiction of some of the most complete early human ancestral remains ever discovered.

Since its discovery in August 2008, the site of Malapalocated about 30 miles northwest of Johannesburghas yielded more than 220 bones of early hominins representing more than five individuals, including the remains of babies, juveniles, and adults. The evidence published in Science is based on two individuals from the site. The fossils from the site date to 1.977 to 1.98 million years in age.

"The abundance and remarkable preservation of fossils from Malapa provide unique insights into the way this fascinating extinct species interacted with and moved around in its environment," said New York University anthropologist Scott Williams, the lead author of one of the six papers appearing in Science.

Williams, part of NYU's Center for the Study of Human Origins, and his colleagues authored a paper describing Au. sediba's vertebral column. The work is the first to analyze elements of the cervical, thoracic, lumbar, and sacral regions of the vertebral column in Au. sediba. Their analysis was based on partially complete spines of the two Au. sediba skeletons.

Their study reveals that Au. sediba had a human-like curvature of the lower back, but it was functionally longer and more flexible than that of modern humans.

"They probably walked in a way that we might find strangea 'compromise' form of bipedalism indicative of a hominin that still partially relied on climbing trees," Williams explained.

He noted that "the adult female is the first early hominin skeleton that preserves an intact terminal thoracic region and this provides critical information on the transition in inter-vertebral joints, and, by inference, mobility of the lower back."

"The bony spine of Au. sediba likely had the same number of vertebrae as that of modern humans," Williams added. "However, it differed in one primary aspect of its configurationthe transition in inter-vertebral articular facets occurred at a higher level of the spine that than normally occurs in modern humans. In combination with other features, a functionally longer lower back would have allowed for a more flexible spine in Au. sediba relative to that of modern humans."

In addition, morphological indicators of strong lumbar curvature suggest that Au. sediba evolved in this regard relative to Au. africanus, which lived between 3.03 and 2.04 million years ago, and closer to the more recent Nariokotome Homo erectus skeletonto date, the most complete early human skeleton discovered.

The research was conducted at the Evolutionary Studies Institute (ESI) at the University of the Witwatersrand (Wits) in South Africa, where Au. sebida's remains were discovered in 2008.

Overall, the fossils provide an "unprecedented insight into the anatomy and phylogenetic position of an early human ancestor," observed Professor Lee Berger, the project leader from the Wits Evolutionary Studies Institute. "This examination of a large number of associated, often complete and undistorted elements, gives us a glimpse of a hominin species that appears to be mosaic in its anatomy and that presents a suite of functional complexes that are both different from that predicted for other australopiths, as well as that for early Homo.

"Such clear insight into the anatomy of an early hominin species will clearly have implications for interpreting the evolutionary processes that affected the mode and tempo of hominin evolution and the interpretation of the anatomy of less well preserved species."


'/>"/>

Contact: James Devitt
james.devitt@nyu.edu
212-998-6808
New York University
Source:Eurekalert

Related biology news :

1. IMPAKT -- Translational research breast cancer conference
2. BUSM researchers identify novel approach to study COPD and treatment efficacy
3. LSUHSC research discovers new drug target for metastatic breast cancer
4. Researchers call for marine observation network
5. Biofilms help Salmonella survive hostile conditions, Virginia Tech researchers say
6. Feinstein Institute collaborates with GSK, UPenn, MIT to research bodys electrical impulses
7. U-M researchers find new way to clear cholesterol from the blood
8. New cutting-edge cell research will lead to safer medical experiments on humans
9. Ludwig presents advancements in immunotherapy and epigenetics at the American Association for Cancer Research Annual Meeting
10. Reliability of neuroscience research questioned
11. Measuring microbes makes wetland health monitoring more affordable, says MU researcher
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:4/17/2017)... , April 17, 2017 NXT-ID, Inc. ... company, announces the filing of its 2016 Annual Report on Form ... Exchange Commission. ... Form 10-K is available in the Investor Relations section of the ... on the SEC,s website at http://www.sec.gov . 2016 ...
(Date:4/11/2017)... Research and Markets has announced the addition of the "Global ... ... at a CAGR of 30.37% during the period 2017-2021. ... based on an in-depth market analysis with inputs from industry experts. ... the coming years. The report also includes a discussion of the ...
(Date:4/5/2017)... , April 5, 2017  The Allen Institute ... Allen Cell Explorer: a one-of-a-kind portal and dynamic digital ... 3D imaging data, the first application of deep learning ... human stem cell lines and a growing suite of ... platform for these and future publicly available resources created ...
Breaking Biology News(10 mins):
(Date:8/18/2017)... ... 2017 , ... Producers of the award winning American Farmer ... upcoming episode, scheduled to broadcast fourth quarter 2017. American Farmer airs Tuesdays at ... family-owned seed company. Educating audiences about its broad portfolio of products to help ...
(Date:8/16/2017)... ... August 16, 2017 , ... ... the Fluidnatek® Electrospinning and Electrospraying line of nanofiber ... from table-top equipment for the lab to fully automated pilot plants and ...
(Date:8/16/2017)... Mass. , Aug. 16, 2017  This year,s edition of the ... leader in life sciences workforce solutions, has made the list for the ... 5000 recognizes the nation,s fastest-growing private companies based on a set of ... 50, which includes the fastest-growing companies in the Bay State ... Inc. 5000 ...
(Date:8/15/2017)... ... August 15, 2017 , ... Pittcon ... exhibitions for analytical and scientific instruments. This year’s symposium, organized by the Pittcon ... Mass Spectrometry for Bioanalytical Applications.” This dynamic presentation will discuss novel ionization processes, ...
Breaking Biology Technology: