NU State Museum researcher helps establish new feathered dinosaur species

LINCOLN, Neb. (Nebraska Today) – Ashley Poust, a paleontologist on the University of Nebraska–Lincoln, is a part of a global crew that has recognized a beforehand unknown species of feathered dinosaur.

The new species, Jian changmaensis, is described in a examine revealed within the Annals of Carnegie Museum. The fossil, found in China’s Changma Basin, represents a member of Microraptorinae, a bunch of small, feathered dinosaurs carefully associated to the evolutionary lineage that led to trendy birds.

Jian changmaensis was a small predatory dinosaur concerning the dimension of a contemporary barn owl that lived about 120 million years in the past within the Early Cretaceous interval. Researchers recognized it from a partial fossil preserving parts of the shoulder and forelimb, however comparisons with associated species recommend it belonged to a bunch of feathered hunters that occupied an vital place within the evolutionary transition between non-avian dinosaurs and birds.

Poust, Dr. Michael and Jane Voorhies Endowed Curator of Vertebrate Paleontology on the University of Nebraska State Museum, contributed comparative anatomy and evolutionary analyses that helped researchers decide the fossil represented a definite species.

“I saw this and thought, ‘That’s almost the same as the thing that I had been studying, only larger,’” Poust mentioned of his first encounter with the specimen throughout a scientific convention presentation years in the past. “That was what initially caught my attention.”

At the time, Poust was a graduate scholar learning small, feathered dinosaurs associated to hen origins. After the presentation, he linked with lead creator Matt Lamanna of the Carnegie Museum of Natural History. The dialogue started a collaboration that included researchers from the Carnegie Museum, Chicago’s Field Museum and establishments in China.

The fossil itself is incomplete, consisting primarily of parts of the shoulder and forelimb preserved in fine-grained lakebed sediments. Despite restricted stays, the specimen preserved sufficient anatomical element for researchers to match it with associated dinosaurs and take a look at for evolutionary relationships.

Poust helped consider how development, preservation and fossil compression could have affected the specimen’s anatomy. He additionally contributed to the examine’s phylogenetic evaluation, a course of that compares lots of of anatomical traits throughout species to find out the place the animal match throughout the dinosaur household tree.

The evaluation constantly positioned the specimen inside Microraptorinae, a bunch recognized for small-bodied predators with feathers and bird-like options. Members of the group are vital to scientists learning the evolution of flight and the transition between non-avian dinosaurs and birds.

Researchers spent years evaluating the fossil earlier than concluding it represented a brand new species.

“You don’t want to assume something is new just because it’s interesting,” Poust mentioned. “You have to let the evidence take you there.”

The discovery expands understanding of microraptorine variety and geographic distribution in the course of the Early Cretaceous interval. Most recognized members of the group have been found in northeastern China. The Changma specimen, discovered lots of of miles away in Gansu Province, suggests these animals occupied a broader vary of environments than beforehand acknowledged.

“This is just one tiny piece of a much larger puzzle,” Poust mentioned. “But it is helping us move toward a complete picture.”

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