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The name Tylosaurus rex belongs to a newly described giant mosasaur—not the dinosaur Tyrannosaurus rex. Researchers identified the marine reptile as a distinct species by reassessing fossils found primarily in northern Texas over several decades. Institutional accounts date the fossils to about 80 million years ago and estimate that the animal reached up to 43 feet long.
What was Tylosaurus rex?
Tylosaurus rex was a mosasaur, an extinct marine reptile. Its abbreviated name, T. rex, can be mistaken for Tyrannosaurus rex, but the two animals were different: this Texas species lived in the sea and was not a dinosaur.
The species was recognized after researchers compared Texas fossils with the name-bearing specimen of Tylosaurus proriger and other material, including more than a dozen similar fossils held by institutions. The finding is a new identification of specimens gathered over decades, not the discovery of a single newly excavated skeleton.
How large was this mosasaur?
American Museum of Natural History and Southern Methodist University accounts of the study, published May 21, 2026, estimate that the specimens assigned to T. rex range from 25 to 43 feet long. The upper estimate is comparable to a school bus, according to the museum accounts; it is an estimate, not a reported measurement of every individual.
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Ron Tykoski, vice-president of science and curator of vertebrate paleontology at the Perot Museum, described the animal as “roughly twice the length of the largest great white sharks” and said it “appeared to be a much meaner animal than other mosasaurs,” in the American Museum of Natural History announcement.
Why do researchers consider it a powerful predator?
The fossils assigned to T. rex have finely serrated teeth, a feature described as uncommon among mosasaurs. Researchers also point to anatomical adaptations consistent with exceptionally strong jaw and neck muscles. Together, these traits support the interpretation of a formidable predator; they do not establish a specific hunting behavior.
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Where were the fossils found, and can you see one?
The species is represented primarily by fossils from northern Texas, collected across several decades. Its name-bearing specimen, or holotype, was discovered in 1979 at Lake Ray Hubbard near Dallas. The Perot Museum of Nature and Science says the specimen is on view in its Life Then and Now exhibit hall in Dallas.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How does Tylosaurus rex compare with Tylosaurus proriger?
The researchers distinguished the Texas fossils from the holotype of T. proriger by comparing anatomy across the specimens. The American Museum of Natural History’s account gives this geographic and age context:
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| Species | Typical fossil geography in the institutional comparison | Age in that comparison | Notable distinction described |
|---|---|---|---|
| Tylosaurus rex | Mostly Texas | About 80 million years | Finely serrated teeth; anatomy consistent with strong jaw and neck muscles |
| Tylosaurus proriger | Mostly present-day Kansas | About 84 million years | Used as the comparison species; no equivalent tooth or muscle description stated in the account |
These are broad patterns reported in the institutional comparison, not claims that every specimen came from those locations or that the ages apply identically to every fossil.
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Sources
- American Museum of Natural History, “Giant Mosasaur Species from Texas Named T. rex,” May 21, 2026
- Southern Methodist University, “New species of massive mosasaur with serrated teeth is named T. rex,” May 21, 2026
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