Evolution of Dinosaurs

Evolution Of Dinosaurs

Dinosaurs evolved from the archosaurs 232-234 Ma (million years ago) in the Ladinian age, the latter part of the middle Triassic. Dinosauria is a well-supported clade, present in 98% of bootstraps. It is diagnosed by many features including loss of the postfrontal on the skull and an elongate deltopectoral crest on the humerus.

Read more about Evolution Of Dinosaurs:  From Archosaurs To Dinosaurs, Earliest Dinosaurs, Saurischia, Ornithischia, Fossil Record, Biogeography, Extinction

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Evolution Of Dinosaurs - Extinction
... period, caused the extinction of all dinosaurs except for the line that had already given rise to the first birds ...

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