A chunk of paleontological history has been rewritten by a Labrador-sized dinosaur misidentified for decades. This specimen was mistakenly labeled as a species already known to science and stored in a museum for decades. However, subsequent studies revealed that this small animal is an entirely new species, not merely a juvenile from a familiar group. Known as the “puzzling runner,” or Enigmacursor mollyborthwickae, the discovery significantly advances our understanding of the dinosaur family tree.
The Fossil’s History
Since the 1870s, the fossil had been identified as a Nanosaurus, one of several tiny dinosaurs. Until recently, it was kept inconspicuously at the Natural History Museum (NHM) in London. Scientists began to question its classification after more detailed research.
NHM researchers brought scans and detailed photographs of the fossil to the United States to confirm their concerns. They compared it to the original Nanosaurus fossil, considered the defining example of the species. What they found was unexpected: the so-called archetype was little more than a rock with faint bone imprints and no precise anatomical detail.
The Breakthrough Discovery
Upon returning to London, a closer examination of the NHM specimen revealed a remarkably complete skeleton with several unique traits. Most notably, the leg bones stood out. Researchers said that subtle differences in the hind limbs were crucial in determining it as a separate species.
These anatomical clues, along with a comprehensive reanalysis, led to the fossil’s formal reclassification. Scientists have now removed Nanosaurus as a valid category, concluding that it lacked sufficient evidence to remain a legitimate category. This shift in classification centered on the discovery that the specimen was a labrador-sized dinosaur misidentified for decades, not a juvenile of an existing species.
Meet the New Dinosaur
Enigmacursor lived about 150 million years ago, during the Late Jurassic Period, a time when massive dinosaurs like Stegosaurus roamed the Earth. Compared to its larger contemporaries, Enigmacursor was just 64 cm tall and 180 cm long—about Labrador height, but with much bigger feet and a tail longer than its body.
Paleontologists believe the dinosaur was a swift runner, supported by its solid, dense hips. Its much smaller forelimbs were likely lifted off the ground and may have been used to gather plant material. Its relatively small head suggests limited cognitive capacity. Based on bone development, scientists think it was likely a teenager when it died.
Scientific and Ecological Significance
The discovery does more than add a name to the fossil record. It sheds light on the evolutionary lineage of small dinosaurs that eventually gave rise to the giant and more bizarre species known from later periods. NHM researchers explained that studying specimens like Enigmacursor allows them to trace the gradual changes and environmental pressures that shaped dinosaur evolution.
According to museum palaeontologists, smaller dinosaurs like Enigmacursor often serve as evolutionary links to larger dinosaur families that gained prominence later. Fossils like this help scientists better understand how these transformations unfolded over time. The importance of recognizing a labrador-sized dinosaur misidentified for decades lies in how it challenges past assumptions and enriches the evolutionary narrative.
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Why It Took So Long
Several factors contributed to the long-standing misidentification: historical mislabeling, incomplete specimens, and a general tendency to overlook smaller fossils. Traditionally, large and dramatic dinosaur bones have drawn more attention, leaving many small species understudied.
Researchers emphasized that correct classification forms the foundation of palaeontology. Without clarity in species identification, the entire evolutionary framework could lose credibility. Enigmacursor is not just another dinosaur; it represents the vast amount that remains to be discovered, even in fossils that have been hiding in plain sight for years.
Final Thoughts
After decades of being overlooked, the labrador-sized dinosaur, misidentified for decades, is finally receiving proper recognition. Displayed in a glass case on the Earth Hall balcony of the Natural History Museum, it is the first new dinosaur featured there since 2014. Positioned directly above Sophie the Stegosaurus, it offers a striking contrast between small and mighty.
Conservators Lu Allington-Jones and Kieran Miles carefully assembled the near-complete skeleton, handling the bones with precision during the final mounting. Scientists hope this exhibit will draw more attention to the “little ones” who lived alongside the giants.
The study, now published in Royal Society Open Science, invites researchers everywhere to revisit ancient fossils with renewed curiosity and remember the evolutionary lessons still hidden in the bones of a Labrador-sized dinosaur misidentified for decades.
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