Exceptionally Preserved Fossil Sheds Light on the Evolution of How Dinosaurs Breathed

Heterodontosaurus Tucki Reconstruction

Life reconstruction of Heterodontosaurus vocalizing on a cool Jurassic morning. Credit: Viktor Radermacher

Using an exceptionally preserved fossil from South Africa, a particle accelerator, and high-powered x-rays, an international team including a University of Minnesota researcher has discovered that not all dinosaurs breathed in the same way. The findings give scientists more insight into how a major group of dinosaurs, including well-known creatures like the triceratops and stegosaurus, evolved.

The study is published in eLife, a peer-reviewed open access scientific journal for the biomedical and life sciences.

Not all animals use the same techniques and organs to breathe. Humans expand and contract their lungs. Birds have air sacs outside their lungs that pump oxygen in, and their lungs don’t actually move. For a long time, paleontologists assumed that all dinosaurs breathed like birds, since they had similar breathing anatomy. This study, however, found that Heterodontosaurus did not — it instead had paddle-shaped ribs and small, toothpick-like bones, and expanded both its chest and belly in order to breathe.

Using a well-preserved fossil and high-powered x-rays, an international team including a University of Minnesota researcher has discovered that not all dinosaurs breathed in the same way. This video shows a 3D digitization of the newly discovered Heterodontosaurus specimen, the oldest ancestor of dinosaurs such as Triceratops and Stegosaurus. Credit: Viktor Radermacher

Heterodontosaurus is the oldest dinosaur in the Ornithischian line, one of three major dinosaur groups that includes Triceratops, Stegosaurus, and other duck-billed dinosaurs. The other groups are sauropods, or longnecks, and theropods like the T-Rex.

“We actually have never known how these [Ornithischians] breathed,” said Viktor Radermacher, lead author of the study and a Ph.D. student in the University of Minnesota’s Department of Earth and Environmental Sciences. “The interesting thing is that Heterodontosaurus is the ancestor of this group and it has these [newly discovered] pieces of anatomy, but its descendants don’t. What that means is that Heterodontosaurus is a missing link between the ancestors of dinosaurs and the bigger, charismatic species we know. This gives us a whole bunch of information and fills in some pretty glaring gaps in our knowledge of the biology of these dinosaurs.”

Heterodontosaurus tucki Specimen Am 4766

The newly discovered Heterodontosaurus tucki specimen (left), along with the researchers’ digital reconstruction of the fossil (right), shows the dinosaur’s unusual paddle-shaped ribs and small, toothpick-like bones. Credit: Viktor Radermacher

The researchers analyzed the new Heterodontosaurus specimen with high-powered x-rays generated from a synchrotron — a giant, donut-shaped particle accelerator that spins electrons at the speed of light — at the European Synchrotron Radiation Facility (ESRF) in France. Using those x-rays, they were able to digitally reconstruct the skeleton and identify the dinosaur’s unique features.

“The takeaway message is that there are many ways to breathe,” Radermacher said. “And the really interesting thing about life on Earth is that we all have different strategies to do the same thing, and we’ve just identified a new strategy of breathing. This shows that utilizing dinosaurs and paleontology, we can learn more about the diversity of animals on Earth and how they breathe.”

For more on this discovery, read 200-Million-Year-Old Fossil Sheds Light on the Evolution of How Dinosaurs Breathed.

Reference: “A new Heterodontosaurus specimen elucidates the unique ventilatory macroevolution of ornithischian dinosaurs” by Viktor J Radermacher, Vincent Fernandez, Emma R Schachner, Richard J Butler, Emese M Bordy, Michael Naylor Hudgins, William J de Klerk, Kimberley EJ Chapelle and Jonah N Choiniere, 6 July 2021, eLife.

DOI: 10.7554/eLife.66036

In addition to Radermacher, the research team included Vincent Fernandez, an ESRF beamline scientist and X-Ray technician at the Natural History Museum, UK; Emma Schachner, an associate professor at Louisiana State University; Richard Butler, a professor of palaeobiology at the