dinosaurian

Titanosaurs are best known from Cretaceous-age rocks in South America, but other efforts by the team include new species discovered in Tanzania, Egypt, and other parts of the African continent that reveal a more complex picture of dinosaurian evolution on the planet.

With their strong, clawed hands and weak jaws, they appear to be the dinosaurian analog to today's aardvarks and anteaters."

On certain dinosaurian vertebrae from the Cretaceous of India and the Isle of Wight.

(2010): A Portuguese specimen of Camptosaurus aphanoecetes (Ornithopoda: Camptosauridae) increases the dinosaurian similarity among the Upper Jurassic Alcobaja and Morrison Formations.

"We are puzzled by the weird anatomy of Chilesaurus, which recalls different dinosaurian groups," said Novas.

There are no features to suggest that any of these teeth are dinosaurian or even ornithodiran, and at least some of them more likely belong to paracrocodylomorph pseudosuchians.

"Ultimately, this evolutionary flexibility helped birds survive the deadly meteorite impact which killed off all their dinosaurian cousins."

From fieldwork and lab studies and the historical evolution of paleontological research, this considers different theories of dinosaur natural history and extinction, provides an organization of the various taxa into a workable order, and compiles dinosaurian genera, including excluded genera or doubtful genera.

Palaeontologist John Ostrom's work in the 1970s describing the dinosaurian "raptor" Deinonychus reopened the debate with new evidence that supported a theropod ancestry for birds.

In fact, life's diversity of taxonomic forms has doubled since the dinosaurian era, only 200 million years ago.