Researchers Proposed Keratin Jaw Covering on Sauropods
A new study suggests that Camarasaurus and other sauropodomorphs may have possessed broad keratinous mouth coverings.
Updated on Sept. 30, 2026 in Geology
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A team of researchers has proposed that sauropods like Camarasaurus were equipped with an odontoscutum, a broad keratinous jaw covering. This study relies on comparing neurovascular patterns in fossils with those found in hundreds of modern reptiles and birds.
Why it matters
The findings aim to explain how these massive dinosaurs maintained intact tooth rows despite the rapid degradation of their jaw bone tissue. This hypothesis suggests that such structural mouth coverings might have been widespread among sauropodomorphs.
Researchers utilized principal-component analysis to compare fossilized skull grooves and holes against 300 living reptiles and birds. The study analyzed three specific sauropod specimens: Camarasaurus, Galeamopus, and Kaatedocus.
The players
Camarasaurus
This herbivorous sauropod lived approximately 150 million years ago and reached lengths of 15 meters.
Edward Drinker Cope
He was a prominent 19th-century American paleontologist known for his extensive work on dinosaur fossils.
The details
The proposed model suggests that while an odontoscutum covered the jaws, the teeth of these 15-meter-long dinosaurs remained partially exposed. This theory challenges previous hypotheses from 2016 and 2024 that argued instead for dense gingival tissue.
Timeline
1877: Edward Drinker Cope coined the name Camarasaurus.
2016: Wiersma and Sander conducted a study on the Camarasaurus specimen.
2019: Wiersma discussed findings related to the specimens in Science.
2024: A study on Europasaurus was published arguing for strong connective tissue.
September 30, 2026: The current study proposing the odontoscutum was published as a preprint.
The Big Picture
This study extends the long-standing efforts to reconstruct the biological characteristics of dinosaurs found within the Morrison Formation ecosystem. It shifts current paleontological understanding by proposing a keratinous structure that replaces previous hypotheses of soft tissue coverage.
The study offers a new perspective on how extinct species interacted with their environment through specialized facial features. While primarily academic, such research helps refine broader evolutionary models of how modern birds and reptiles inherited traits from dinosaur ancestors.
The takeaway
This proposal provides a new lens for examining how sauropod teeth survived wear and tear over millions of years. Future research will likely focus on confirming these keratinous structures through larger comparative fossil datasets.
Further reading
For more on how scientists reconstruct ancient environments, visit our Geology section.
Source note: This article includes information reported by ZME Science.
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