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Quetzalcoatlus humerus ~ This humerus, or upper arm bone, belonged to Quetzalcoatlus northropi, one of the largest pterosaurs found to date. A geology student discovered this fossil in a gulch in southwestern Texas, but the only remains he could find were parts of one wing. The massive knob at the shoulder end was an attachment point for powerful muscles - a clue that this animal was capable of flight.

Photos of Pterosaurs: Flight in the Age of Dinosaurs

Pterosaurs: Flight in the Age of Dinosaurs

Diadectes (meaning crosswise-biter) is an extinct genus of large, very reptile-like amphibians that lived during the early Permian period (Cisuralian epochs, between 290 and 272 million years ago[1]). Diadectes was one of the very first herbivorous tetrapods, and also one of the first fully terrestrial animals to attain large size.

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Diadectes (meaning crosswise-biter) is an extinct genus of large, very reptile-like amphibians that lived during the early Permian period (Cisuralian epochs, between 290 and 272 million years ago[1]). Diadectes was one of the very first herbivorous tetrapods, and also one of the first fully terrestrial animals to attain large size.

The Geology of Time... - a grouped images picture - Pin Them All

When I was very young, around kindergarten to grade, I wanted to be a paleontologist and dig up dinosaur bones. I also wanted to be a scientist/rockstar and I would have my mom read me dinosaur books instead of bedtime stories

Ouch! A fossilized boomerang-head suffered a life-ending bite to the nose by a finbacked Dimedtrodon.

In Photos: Fossils Reveal Bizarre Boomerang-Headed Amphibian

Ouch! A fossilized boomerang-head suffered a life-ending bite to the nose by a finbacked Dimedtrodon.

Waking the T. Rex: The Story of SUE

Waking the T. Rex: The Story of SUE traces the life of one of the most feared predators of the Cretaceous. Join scientists as they decipher fossil clues to p.

Gorgonopsid Avatar

History of the Earth: August Therapsids were a group of synapsids, the tetrapods that sort of bridge the gap between ancestral reptiles and ancestral mammals. They evolved from the pelycosaurs, which included dimetrodons and their relatives.

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Longrich named the newly discovered dinosaur species Mojoceratops after its flamboyant, heart-shaped skull. Credit: Photo by Nicholas Longrich

T. Rex Arrives in Washington, D.C. | National Geographic

The Nation's Tyrannosaurus rex, found in Montana 26 years ago, arrived early Tuesday morning at the Smithsonian's National Museum of Natural History.

Vintage Dinosaur Paleontology mammoth skeleton poster illustration from a Vintage French Larousse Dictionary poster 1930

“Is anyone else fascinated by antique illustrations of ancient beasts? This beauty is from a 1922 French Encyclopedia.

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Often mistaken for a true dinosaur, Dimetrodon was actually a sail-backed reptile that lived tens of millions of years before the first dinosaurs had evolved. Here are 10 fascinating facts about this Permian pelycosaur.

How Much Do You Know About Dimetrodon?

All Together Now: DIMETRODON IS NOT A DINOSAUR: . In fact, unlike pterosaurs, ichthyosaurs and plesiosaurs, Dimetrodon isn't even a reptile, but instead belongs to a diverse group of animals that includes all modern day mammals.

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