Navigation Links
Dinosaur from Sahara ate like a 'mesozoic cow'
Date:11/15/2007

WASHINGTONA 110 million-year-old dinosaur that had a mouth that worked like a vacuum cleaner, hundreds of tiny teeth and nearly translucent skull bones will be unveiled Thursday, Nov. 15, at the National Geographic Society.

Found in the Sahara by National Geographic Explorer-in-Residence Paul Sereno, paleontologist and professor at the University of Chicago, the dinosaur is a plant eater known as Nigersaurus taqueti. Originally named by Sereno and his team in 1999 with only a few of its distinctive bones in hand, Nigersaurus has emerged as an anatomically bizarre dinosaur.

Nigersaurus, a younger cousin of the more familiar North American dinosaur Diplodocus, is small for a sauropod, measuring only 30 feet in length. It managed to sustain its elephant-sized body with a featherweight skull armed with hundreds of needle-shaped teeth, said Sereno. Barely able to lift its head above its back, Nigersaurus operated more like a Mesozoic cow than a reptilian giraffe, mowing down mouthfuls of greenery that consisted largely of ferns and horsetails.

Details of the dinosaurs anatomy and lifestyle will be published Nov. 21, 2007, (available Nov. 15) in PLoS ONE, the online journal from the Public Library of Science, as well as in a cover article in the December 2007 issue of National Geographic magazine, Extreme Dinosaurs.

Serenos research was partly funded by the National Geographic Society. An exhibit on Nigersaurus, including the original fossils and a reconstructed skeleton and skull of the dinosaur, will open Nov. 15 at the National Geographic Museum at Explorers Hall.

The dinosaurs oddest feature was a broad, straight-edged muzzle, which allowed its mouth to work close to the ground. Unlike any other plant eater, Nigersaurus had more than 50 columns of teeth, all lined up tightly along the front edge of its squared-off jaw, forming, in effect, a foot-long pair of scissors.

A CT scan of the jaw bones showed up to nine replacements stacked behind each cutting tooth, so that when one wore out, another immediately took its place. There were more than 500 teeth in total, with a new tooth in each column joining the scissors edge every month. Among dinosaurs, Sereno said, Nigersaurus sets the Guinness record for tooth replacement.

Sereno and coauthors write in PLoS ONE that Nigersaurus downwardly deflected muzzle may characterize most diplodocoids, such as North Americas Diplodocus. Some of these unusual sauropods thrived to become the pre-eminent ground-level feeders of the Mesozoic, said coauthor Jeffrey Wilson, assistant professor at the University of Michigan.

CT scanning allowed Sereno and team to look inside the dinosaurs braincase. There, small canals of the brains balancing organ revealed the habitual pose of the head. Reconstructed from CT scans, these canals showed that the muzzle of Nigersaurus angled directly toward the ground, unlike the forward-pointing snouts of most other dinosaurs. This feature, along with unusual wear facets on the animals teeth, led Sereno and colleagues to conclude that Nigersaurus largely fed by cropping plants near the ground.

Coauthor Lawrence Witmer, professor at Ohio University, who imaged the brain and organ of equilibrium, said, What we have here is the first good look at a sauropod brain, and it has important things to say about this animals posture and behavior.

Jaw design was not Nigersaurus only odd characteristic: It had a backbone that was more air than bone. The vertebrae are so paper-thin that it is difficult to imagine them coping with the stresses of everyday use but we know they did it, and they did it well, said Wilson, who was an expedition team member.

The first bones of Nigersaurus were picked up in the 1950s by French paleontologists, though the species was not named. Sereno and his team honored this early work by naming the species after French paleontologist Philippe Taquet. Serenos team member Didier Dutheil first spotted the skull bones of Nigersaurus in 1997, and on that expedition and the next, teams collected about 80 percent of the skeleton.

The fossil area, in the present-day nation of Niger, was home to the enormous extinct crocodilian nicknamed SuperCroc as well as the likely fish eater Suchomimus, both found by Sereno and both on the prowl for Nigersaurus some 110 million years ago. Then, the African continent was just beginning to free itself of land connections it inherited as a central part of the ancient supercontinent Pangaea. Nigersaurus closest relative has been found recently in Spain.


'/>"/>

Contact: Rebecca Walton
rwalton@plos.org
44-122-346-3333
Public Library of Science
Source:Eurekalert

Related biology news :

1. New dinosaur species found in Montana
2. Emory paleontologist reports discovery of carnivorous dinosaur tracks in Australia
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:6/20/2016)... 2016 Securus Technologies, a leading provider ... public safety, investigation, corrections and monitoring announced that ... has secured the final acceptance by all three ... Access Systems (MAS) installed. Furthermore, Securus will have ... installed by October, 2016. MAS distinguishes between legitimate ...
(Date:6/15/2016)... 15, 2016 Transparency Market ... Recognition Market by Application Market - Global Industry Analysis Size ... to the report, the  global gesture recognition market ... and is estimated to grow at a CAGR ... 2024.  Increasing application of gesture recognition ...
(Date:6/9/2016)... 9, 2016 Paris Police ... video security solution to ensure the safety of people and ... during the major tournament Teleste, an international technology ... services, announced today that its video security solution will be ... back up public safety across the country. The system roll-out ...
Breaking Biology News(10 mins):
(Date:6/23/2016)... , June 23, 2016  Blueprint Bio, a ... discoveries to the medical community, has closed its Series ... Matthew Nunez . "We have received a ... the capital we need to meet our current goals," ... provide us the runway to complete validation on the ...
(Date:6/23/2016)... ... June 23, 2016 , ... ClinCapture, the only free validated ... will showcase its product’s latest features from June 26 to June 30, 2016 ... on Disrupting Clinical Trials in The Cloud during the conference. DIA (Drug ...
(Date:6/23/2016)... -- Amgen (NASDAQ: AMGN ) today announced a ... sciences incubator to accelerate the development of new therapies ... QB3@953 was created to help high-potential life science and ... stage organizations - access to laboratory infrastructure. ... "Amgen Golden Ticket" awards, providing each winner with one ...
(Date:6/22/2016)... Research and Markets has announced the addition ... their offering. The global ... billion in 2013. The market is expected to grow at a ... 2020, increasing from $50.6 billion in 2015 to $96.6 billion in ... forecast period (2015 to 2020) are discussed. As well, new products ...
Breaking Biology Technology: