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However, viruses are still poorly understood and may have arisen before "life" itself, or may be a more recent phenomenon. Major extinctions in terrestrial vertebrates and large amphibians. Earliest examples of armoured dinosaurs. 195 Ma First pterosaurs with specialized feeding (Dorygnathus). First sauropod dinosaurs.
List of Asian dinosaurs; List of Australian and Antarctic dinosaurs; List of dinosaurs and other Mesozoic reptiles of New Zealand; List of European dinosaurs; List of Indian and Madagascan dinosaurs; List of North American dinosaurs. List of Appalachian dinosaurs; List of archosaurs of the Chinle Formation; List of dinosaurs of the Morrison ...
The history of life on Earth traces the processes by which living and extinct organisms evolved, from the earliest emergence of life to the present day. Earth formed about 4.5 billion years ago (abbreviated as Ga, for gigaannum) and evidence suggests that life emerged prior to 3.7 Ga. [1] [2] [3] The similarities among all known present-day species indicate that they have diverged through the ...
The footprints, found at several sites in southern Africa, were recently identified as the oldest birdlike tracks ever found, preceding the earliest known skeletal fossils of avians by about 60 ...
A massive, fanged creature with a head shaped like a toilet seat lurked in swamps near the edge of the world 280 million years ago, long before the first dinosaurs appeared, new research has found.
Similar animals like the long-tailed Rhamphorhynchus and Gnathosaurus were soon discovered around Europe and it became obvious that earth was once home to a diverse group of flying reptiles. [5] The British anatomist Sir Richard Owen dubbed this vanished order the Pterosauria. Soon after, he described Britain's own first pterosaur, Dimorphodon. [6]
Paleontologists debate whether silesaurids were true dinosaurs or possibly a precursor to the creatures that once dominated the Earth. ... Aurelio found the fossil in the town of Paraiso do Sul in ...
Through the first half of the 20th century, before birds were recognized as dinosaurs, most of the scientific community believed dinosaurs to have been sluggish and cold-blooded. Most research conducted since the 1970s, however, has indicated that dinosaurs were active animals with elevated metabolisms and numerous adaptations for social ...