Tyrannosaurus Skeletal Remains Reveal T. rex May Have Been 3 Distinct Species

March 3, 2022

A new analysis of Tyrannosaurus skeletal remains reveals physical differences in the femur, other bones, and dental structures across specimens that could suggest Tyrannosaurus rex specimens need to be re-categorized into three distinct groups or species, reports a study published in Evolutionary Biology.

Tyrannosaurus rex is the only recognized species of the group of dinosaurs, or genus, Tyrannosaurus to date. Previous research has acknowledged variation across Tyrannosaurus skeletal remains in the femur (thighbone) and specimens with either one or two slender incisor teeth on each side of front ends of the jaw.

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