Figure 1: Changes in adult digit number across archosaur phylogeny. These data show three things: first, expression of the early cartilage marker Sox9 can persist even when multiple digits have ...

With bony plates on its backbone, this archosaur fossil reveals that armor was a boomerang trait in the story of dinosaur and pterosaur evolution: the group's ancestors were armored, but this ...

Dinosaurs are part of a larger group known as the archosaurs — a lineage of reptiles that split into a “bird-line” branch that includes pterosaurs, dinosaurs and birds, and a “crocodilian ...

Dinosaurs are part of a larger group known as the archosaurs — a lineage of reptiles that split into a “bird-line” branch that includes pterosaurs, dinosaurs and birds, and a “crocodilian ...

Dinosaurs are part of a larger group known as the archosaurs — a lineage of reptiles that split into a “bird-line” branch that includes pterosaurs, dinosaurs and birds, and a “crocodilian ...

Dinosaurs are part of a larger group known as the archosaurs — a lineage of reptiles that split into a “bird-line” branch that includes pterosaurs, dinosaurs and birds, and a “crocodilian ...

is the earliest diverging member of the bird line of archosaur evolution. The fossil, which is about 235 million years old, was found in 1997 in Madagascar by a team of researchers led by the ...