Ancient serpent shows its 2 leg BBC - April 10, 2008
Ancient serpent shows its 2 leg BBC - April 10, 2008
Canada: Ancient reptile tracks unearthed BBC - October 17, 2007
National Geographic - April 20 , 2006
An ancient snake with hips connected to its spine might be proof that slithery serpents originated on land, not in the water, a new fossil find reveals. The fossil snake - which has a primitive pelvis and robust, functional legs outside the ribcage - dates from about 90 million years ago.
Sebastian Apesteguía, a researcher with the Argentine Museum of Natural Science, says the new fossil is not the oldest snake fossil ever found. Older marine snakes have been unearthed in North Africa and Eastern Europe.But the species, named Najash rionegrina, is the earliest limbed snake ever found in a fully terrestrial deposit, he says.
"But the species, named Najash rionegrina, is the earliest limbed snake ever found in a fully terrestrial deposit," he says.
N. rionegrina was discovered in Argentina's Rio Negro province, about 700 miles (1,130 kilometers) southwest of Buenos Aires
Many living snakes, such as pythons, have the vestiges of legs that are not attached to the backbone and simply hang from the body.
By contrast, Apesteguía said, "In Najash the hip was connected to the vertebrae, so it has a sacrum. No other known fossil or extant snake is so primitive as to retain this feature."
The sacrum is the bony structure that connects the spine to the hips in vertebrates, including humans.
The animal's sacral region would have made its legs well suited to digging or crawling, the researchers say, giving weight to a land-based origin for snakes.
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