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Scientists Reveal Largest Tyrannosaurus rex Skeleton

An Older and Exceptionally Large Adult Specimen of Tyrannosaurus rex

Thursday, March 28, 2019 1:01 pm EDT
"This T. rex lived longer than any other yet discovered. Its skeleton is riddled with injuries that attest to the many battles fought over its lifetime"

Paleontologists have discovered and characterized the largest Tyrannosaurus rex skeleton ever found, making it the biggest terrestrial carnivore currently known to science. The details are described in The Anatomical Record.

The skeleton was actually discovered in 1991 in Saskatchewan, Canada, but the extremely hard matrix surrounding the bones, in combination with the size of the specimen, made it especially difficult and time-consuming to remove, assemble, and study.

Bone analyses revealed that this particular T. rex lived an unusually long, yet violent, life. Its body mass was estimated to be approximately 8,870 kgs. The largest body mass of a T. rex prior to this discovery was 8,460 kg. The specimen also has an estimated weight more than 40 percent greater than the next largest known dinosaur taxon. 

The discovery suggests that different types of dinosaurs may have grown to significantly greater sizes than currently known specimens indicate.

“This T. rex lived longer than any other yet discovered. Its skeleton is riddled with injuries that attest to the many battles fought over its lifetime,” said lead author Dr. W. Scott Persons, IV, of the University of Alberta, in Canada.

Twitter handle: @WScottPersons

Additional Information

Link to Study: 

About Journal 

The Anatomical Record: Advances in Integrative Anatomy and Evolutionary Biology, an official publication of the American Association of Anatomists, publishes new discoveries in the morphological aspects of molecular, cellular, systems, and evolutionary biology. The journal focuses on major new findings in the anatomical consequences of gene disruption, activation, or over expression upon cell, tissue, or organ architecture and also recognizes the importance of descriptive studies in contemporary research, particularly when framed in the context of experimental models or questions. Another important priority will be those discoveries and new advances made through the use of imaging modalities ranging from those that image real-time signaling processes to ones that image protein or gene expression in individual cells, tissues, or whole organisms. Papers are accepted dealing with functional morphology of any vertebrate organ system including those with a developmental, comparative, or evolutionary theme. The area of coverage is directed primarily to the organ or system level, where descriptive studies of normal and abnormal development become an important consideration in characterizing phenotypes. In addition, timely reviews of important topics related to Anatomy and its subdisciplines are regularly included. The criteria of acceptance of all papers are the quality of the research, its originality and significance to our readership.

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