50-million-year-old snake gets a CT scan

The Photo: Lasers lock X-ray beams onto the remains of Clarisse, a 50-million-year-old snake.  Photo by Denny Angelle/The Methodist Hospital System.

The Methodist Hospital , Houston, TX - 9/10/2010

A completely fossilized snake, found in the Fossil Butte region of Wyoming, was brought to Houston, Texas for a CT scan at the Methodist Hospital.  Paleontologist Hussan Zaher professor and curator of the collections of herpetology and paleontology at the Museu de Zoologia of the Universidade de São Paulo in Brazil, worked with the Museum of Natural Science in Houston for the scan.

"Most fossilized remains of snakes are individual pieces of bone," said Zaher. "This is unique because it's a complete snake, which gives us an opportunity to study her makeup and hopefully learn more about her."

CT scan technician Pam Mager conducted the scan on a 64-slice scanner that is capable of sending laser-guided X-rays through a target. "We can take almost 3,000 images in less than a minute," she explained, "and then we can use those images to construct a three-dimensional picture of the snake's bone structure."

Zaher believes this snake could be an evolutionary link between altheonphidian snakes that eat small, elongated prey because they cannot open their mouths widely to swallow large prey and the macrostomate snakes that are capable of eating large prey.

The snake fossil was preserved in limestone, and the entire chunk of rock was placed on the bed of the CT scanner. In less than a minute, the images were taken and assembled by computer into a three-dimensional image that could be rotated 360 degrees.

Taking a preliminary look at the images, Zaher said he saw no traces of limbs. "That places it higher up the evolutionary scale, but the snake is still very old," he said. For more than an hour, he and technician Mager studied the images, looking at tiny details of the snake's skull to find clues to how it may have eaten its prey.

Clarisse is the best preserved Cenozoic snake known in a U.S. scientific collection. According to preliminary analysis, this snake is believed to be closely related to Boavus indelmani, a booid snake described in the late 1930′s. Zaher and the Houston museum hoped that getting a look at the underside of this unique fossil, as well as the inside of bones like the skull would shed some light on the evolutionary history of the species, and its relationship to booid snakes (like pythons and boas).

"This is a very important step in studying this specimen ... I will be able to take away copies of the images for further investigation and I believe this will help us learn about this snake," Zaher said. "I cannot express my gratitude enough to (The Methodist Hospital) and the radiology services department here."

The snake is part of the collection at the Houston Museum of Natural Science and will go on display in 2012.