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New Dog-Sized Dinosaur Species Discovered

On July 3, 2025, the Natural History Museum, London, unveils the most complete specimen of Enigmacursor mollyborthwickae, the first new dinosaur displayed at the museum since 2014.
Between 2021 and 2022, a private fossil company unearthed a skeleton in Colorado's Morrison Formation, initially classified as Nanosaurus.
Specimens reveal Enigmacursor was 64 cm tall, 180 cm long, and roamed in the Late Jurassic, with small legs enabling quick movement.
This discovery illuminates small dinosaur evolution and challenges previous classifications, emphasizing the need to reconsider historic assumptions about Jurassic species.
Beyond this find, many small ornithischian dinosaur species likely remain undiscovered, broadening our understanding of Jurassic diversity and prompting further searches in well-studied regions.

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Smithsonian Mag

Center

'Enigmatic' Dog-Sized Dinosaur Reveals a New Species That Scampered Around Jurassic North America

The speedy, plant-eating creature lived in what is now Colorado roughly 150 million years ago, and its skeleton went on display in London this week

1 day ago·United States

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Green Matters

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A New Dinosaur the Size of a Dog Has Been Discovered in Colorado

If you enjoy the study of dinosaurs and the never-ending search for new species, you'll appreciate the news of researchers' latest discovery.

2 days ago·New York, United States

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Live Science

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Enigmatic 'runner' dinosaur from Colorado helps rewrite understanding of several Jurassic species

The discovery of Enigmacursor mollyborthwickae, a dog-size "runner" dinosaur, has left researchers re-evaluating Nanosaurus and several other US dinosaurs from the Morrison Formation in Colorado.

2 days ago·United States

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Santa New Mexican

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Dinosaur found in New Mexico predates T. rex, helps solve mystery

2 days ago

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KIFI

+5 Reposted by 5 other sources

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A New Species of Dog-Sized Dinosaur Has Been Discovered.

By Issy Ronald, CNN Scientists have discovered a new species of dinosaur: a dog-sized one that roamed what is now the United States about 150 million years ago alongside familiar dinosaurs like Stegosaurus and Diplodocus. Enigmacursor mollyborthwickae, as the researchers named it, was about the same size as a Labrador retriever, with a tail that made up about half its length, according to a study published Wednesday in Royal Society Open Science.

3 days ago·Idaho Falls, United States

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CNN

+4 Reposted by 4 other sources

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New dog-sized dinosaur species discovered

Scientists have discovered a new species of dinosaur — one that was dog-sized and roamed what is now the United States around 150 million years ago alongside familiar dinosaurs like stegosaurus and diplodocus.

3 days ago·Atlanta, United States

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