The iconic Tyrannosaurus rex, or “T. Rex,” might need to be re-categorized into three distinct species, according to researchers. The Tyrannosaurus rex is the only recognized…
The iconic Tyrannosaurus rex, or “T. Rex,” might need to be re-categorized into three distinct species, according to researchers.
Dental structure also varied and those with one incisorform tooth were correlated with often having higher femur gracility.Salvatore Di Nolfi/EPA-EFE/Shutterstock 28 specimens could be identified in distinct layers of sediment at the Lancian upper Maastrichtian formations in North America – which was estimated to be from between 67.5 to 66 million years ago – and the paleontologists compared Tyrannosaurus specimens with other theropod species found in lower layers of sediment.Philippe Wojazer/REUTERS
“One robust species with two small incisors in each dentary appears to have been present initially, followed by two contemporaneous species both of which had one small incisor in each dentary, suggesting both anagenesis and cladogenesis occurred,” they continued. , in which changes occur within a lineage. Whereas, in cladogenesis, a lineage splits into two or more separate lines.
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