JOURNAL ARTICLE

Mini-tyrannosaur lived alongside T. rex , extraordinary fossil confirms: Study finds fresh evidence for Nanotyrannus , a dinosaur whose existence has long been debated.

  • Published In: Sciencemag.org, 2025. P. N.PAG 1 of 3

  • Database: Applied Science & Technology Source Ultimate 2 of 3

  • Authored By: Tamisiea, Jack 3 of 3

Abstract

The article discusses new evidence supporting the existence of the dinosaur Nanotyrannus, suggesting that it coexisted with Tyrannosaurus rex over 66 million years ago in western North America. A recent analysis of the Dueling Dinosaurs fossil, which includes a nearly complete skeleton, indicates that the smaller predator was a nearly mature Nanotyrannus rather than a juvenile T. rex, as previously thought. Researchers found distinct anatomical features and growth patterns that differentiate Nanotyrannus from T. rex, leading to the proposal of a new species, Nanotyrannus lethaeus. The findings contribute to ongoing debates about the classification and ecological roles of these ancient predators. [Extracted from the article]

Additional Information

  • Source:Sciencemag.org. 2025/10, pN.PAG
  • Document Type:Article
  • Subject Area:Anatomy and Physiology
  • Publication Date:2025
  • Accession Number:189053280
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