Sauro-Throat! Study finds first evidence indicating dinosaur respiratory infection

Sauro-Throat! Study finds first evidence indicating dinosaur respiratory infection
Hypothetical life restoration of MOR 7029. Note that the pulmonary disease infecting this animal would not have been externally evident, but the probable pneumonia-like outward symptoms would have included coughing, labored breathing, nasal discharge, fever, and weight loss, among others. Credit: Woodruff, et al. (2022) and Corbin Rainbolt.

The fossilized remains of an immature diplodocid—a large, long-necked herbivorous sauropod dinosaur, like Brontosaurus—may provide the first evidence of a unique respiratory infection in a dinosaur, according to a study published in Scientific Reports. The findings increase our understanding of the illnesses that affected dinosaurs.

The specimen, nicknamed "Dolly," was discovered in southwest Montana, U.S., and dates back to the Late Jurassic Period of the Mesozoic Era (approximately 150 million years ago). Cary Woodruff of the Great Plains Dinosaur Museum in Malta, along with his colleagues, examined three of the (the bones from the neck) from Dolly and identified never-before-seen abnormal bony protrusions that had an unusual shape and texture. These protrusions were located in an area of each where they would have been penetrated by air-filled sacs. These air sacs would have ultimately connected to Dolly's lungs and formed part of the dinosaur's complex . CT imaging of the irregular protrusions revealed that they were made of abnormal bone that most likely formed in response to an infection.

"Given the likely symptoms this animal suffered from, holding these infected bones in your hands, you can't help but feel sorry for Dolly," Woodruff said. "We've all experienced these same symptoms—coughing, trouble breathing, a fever, etc. – and here's a 150-million-year-old dinosaur that likely felt as miserable as we all do when we're sick."

Sauro-Throat! Study finds first evidence indicating dinosaur respiratory infection
CT scans of infected vertebra from Dolly. Photograph and scan model of the infected vertebra (A & B respectively). The colored lines in (B) correspond to the scan slices (and scan interpretative drawings below). White arrows point to the externally visibly abnormal bone growth, while black arrows denote the internal irregularities. (C) Comparison of the abnormal tissue composition of Dolly (left), compared to that of a 'normal' sauropod (right). Credit: Woodruff, et al.

Based on the location of these abnormal bony protrusions, the researchers suggest that they formed in response to a in Dolly, which ultimately spread into these via the air sacs and caused the irregular bone growths. The authors speculate that this respiratory infection could have been caused by a similar to aspergillosis, a common respiratory illness that affects birds and reptiles today and can lead to bone infections. In addition to documenting the first occurrence of such a respiratory infection in a dinosaur, this fossilized infection also has important anatomical implications for the respiratory system of sauropod .

"This fossil infection in Dolly not only helps us trace the evolutionary history of respiratory-related diseases back in time, but gives us a better understanding of what kinds of diseases dinosaurs were susceptible to," Woodruff said.

Sauro-Throat! Study finds first evidence indicating dinosaur respiratory infection
Abnormal bony growth in MOR 7029. (A) Schematic map of the neck of Diplodocus, with the abnormal bone growth denoted in red. (B) Neck vertebra of MOR 7029 with a red box highlighting the abnormal structure; close up in (C) with interpretative drawing in (D) (abnormal structure in red). Credit: Woodruff, et al.

The researchers suggest that if Dolly had been infected with an aspergillosis-like respiratory infection, it likely experienced flu or pneumonia-like symptoms such as weight loss, coughing, fever, and breathing difficulties. As aspergillosis can be fatal in birds if untreated, a potentially similar in Dolly could have ultimately caused the death of the animal, they add.

Sauro-Throat! Study finds first evidence indicating dinosaur respiratory infection
The elaborate and circuitous pulmonary complex of the sauropod, with the hypothetical route of infectious pathway in MOR 7029. Human scale bar is the profile of a man standing 170cm tall. Credit: Woodruff, et al., and Francisco Bruñén Alfaro.

In addition to Woodruff, the research team included a paleopathologist/veterinarian, Ewan Wolff (University of New Mexico); a veterinarian, Sophie Dennison (TeleVet Imaging Solutions, Oakton, Va.); and two paleontologists who are also medical anatomists, Mathew Wedel (Western University of Health Sciences, Pomona, Calif.) and Lawrence Witmer (Ohio University Heritage College of Osteopathic Medicine, Athens, Ohio).


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More information: Cary Woodruff, The first occurrence of an avian-style respiratory infection in a non-avian dinosaur, Scientific Reports (2022). DOI: 10.1038/s41598-022-05761-3. www.nature.com/articles/s41598-022-05761-3
Journal information: Scientific Reports

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Citation: Sauro-Throat! Study finds first evidence indicating dinosaur respiratory infection (2022, February 10) retrieved 28 June 2022 from https://phys.org/news/2022-02-sauro-throat-evidence-indicating-dinosaur-respiratory.html
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