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New reptile species from 212 million years ago


An extinct reptile related to crocodiles that lived 212 million years ago in present day New Mexico has been named as a new species, Vivaron haydeni, in a paper published this week by Virginia Tech's Department of Geosciences researchers.

New reptile species from 212 million years ago
Artist's rendering of a Vivaron haydeni that lived more than 200 million years ago 
[Credit: Matt Celeskey]
Leading the paper that names the previously unknown animal is undergraduate researcher Emily Lessner of Kennett Square, Pennsylvania, a double major in the departments of Geosciences and Biological Sciences, both in the Virginia Tech College of Science. Lessner's paper detailing the fossil of the animal -- jawbones, other skull fragments, and hip-bones -- appears in this week's open science journal, PeerJ.

Vivaron haydeni was found in Ghost Ranch, New Mexico, in 2009 during an excavation co-led by Sterling Nesbitt, then a postdoctoral researcher at the University of Texas at Austin, and now an assistant professor of geosciences at Virginia Tech. Some of the fossils remained sealed in protective plaster jackets until 2014, when they were transported to Blacksburg for study. That's where Lessner enters.

At the time a sophomore majoring in Biological Sciences with a minor in Geosciences, she was seeking an independent research experience that piqued her interest and provided a challenge. She found it with the Paleobiology Research Group in Derring Hall.

Nesbitt had not arrived on campus yet and was looking for students interested in conducting research projects. When Lessner heard of the opportunity and the chance to work with Nesbitt and Michelle Stocker, also a newly arriving paleontologist in the college, Lessner jumped at the chance.

New reptile species from 212 million years ago
Holotype right maxilla of Vivaron haydeni gen. et. sp. nov. (GR 263) in (A) lateral and (B) medial views 
(with interpretive drawings) [Credit: Emily J. Lessner et al., Peer J]
"Initially, I cleaned fossils in the lab and worked on a project reconstructing soft tissue structures using computed tomographic, or CT, scans on the computer," said Lessner, now a senior. "I began looking at Vivaron pretty soon after."

The name of the new species came from Lessner. Vivaron haydeni is named for a famed, monstrous snake -- 30 feet long -- of Ghost Ranch lore, a story passed around campfires more than a century ago, and John Hayden, a hiker who in 2002 discovered the New Mexico quarry from which the fossils were collected.

The fossil represents the sixth species of rauisuchid found thus far, and the second found in what is now the American Southwest, but was once part of the western portion of the supercontinent Pangea.

Vivaron was a carnivorous archosaur -- a large set of animals that includes crocodilians and dinosaurs, as mammals includes humans and dogs. Vivaron itself measured 12 to 18 feet long, and walked on four legs. Thus far, three jaw bones, other skull fragments, and hip-bones from at least three individuals -- two large, one smaller -- have been found.

"These were some of the biggest predators at the time, all dinosaurs were much smaller," added Nesbitt, speaking of the Triassic Period, more than 200 million years ago.

Vivaron is distinguishable by its upper jaw bone, which is smoother in appearance than other rauisuchid species. Other features of the animal must be inferred from close relatives. The New Mexico location in which it was found is a hot spot for paleontology research. Other parts of Vivaron may still be there.

"It is possible that other bones were not preserved, were previously collected, or are still in the ground," said Lessner, who added geosciences as a second major soon after beginning work on Vivaron.

Bones of Vivaron that Lessner took apart, cleaned, and are on hand in the paleontology lab, some kept in protective sleeves and plaster jackets as they are thin and incredibly fragile. The detailed cleaning process was as much a learning process as any part of Lessner's work with the lab. "When you look at anything so long, so close, you realize extra details and patterns you would not otherwise notice," she added.

Source: Virginia Tech [September 08, 2016]
TANN

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