Have we finally arrived at a consensus on T-Rex's ancestor?
on Monday, Elias Warshaw and Denver Fowler, research associates at Badlands Dinosaur Museum, report the discovery of a new species of, which contains a combination of features found in older tyrannosaurs - such as a set of horns around the eyes, along with features that were known from later members of the family, like T-Rex. These features included ais a "halfway point" or “missing link” between older and younger tyrannosaur species, the researchers said in a statement.
"However, a wealth of new specimens and a better understanding of their placement in time has changed what we think. We can now see that many of these species are actually very finely separated in time from each other, forming consecutive ladder-like steps in a single evolutionary lineage where one ancestral species evolves directly into a descendant species," the researchers said.
The new study explains the addition of tyrannosaurs to an increasing list of dinosaurs for which linear evolution has been proposed. Known as the "anagenesis" mode of evolution, it contrasts with "cladogenesis", where successive branching produces species that are closely related and look alike.Here we describe a new derived tyrannosaurine, Daspletosaurus wilsoni sp. nov.
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