Crassigyrinus scoticus (large tadpole) had a streamlined body up to 1.5 meters long and 30 cm wide.
The prehistoric animal legs were small in comparison to his body and probably of little value, this indicates that the Crassigyrinus scoticus was perfectly adapted to aquatic environments and did not venture in land area.
The highlight of the Crassigyrinus scoticus was that he was big and strong jaws, equipped with two rows of sharp teeth.
Studies have shown that this Carboniferous animal had a jaw opening up to 60 ° can easily catch their prey. To this we must add a lot of pressure that made his jaw bite one of the most fearsome of the time.
The jaw opening and the speed and agility that gave it its long body and aerodynamic, suggests that between prey fish came fast movements.
Crassigyrinus had eyes rather large, thereby helping to find prey in dark places or in murky water.
This prehistoric amphibian lived in Europe (fossils have been found mainly in Scotland) during the Carboniferous.
Megalosaurus was a predator of some up to 10 meters long and weighing 1 t. He lived in what is now Europe, America, Asia and Africa during the Jurassic period, 181 made 169 million years.
Among their prizes were sauropods, large prehistoric animals and stegosaurs and mammals.
Besides being a fast predator, with speeds that could reach 40 km / h thanks to its well-balanced structure, the Megalosaurus also got their food scavenging.
The Megalosaurus was one of the first dinosaur discoveries, England 1818. At that time, and seeing the fossils found, these bones were so enormous that gave its name Megalosaurus (great lizard).
The jaw of Megalosaurus had teeth long and curved, strongly subject to the gums to avoid losing in the struggle. The teeth were sharp with the corrugated edge that worked like a saw. Ripping a more efficient prey.
To make matters worse, had prehistoric animal with sharp claws and tear that held the hard skin of the victims.
The Ceratosaurus had skulls with a structure similar to the dorsal horn on the snout, centrally placed in the nasal cast. They had fused sacral bones (Synsacrum) and the pelvic bones together and held together this structure. A row of small bony nodules or osteoderms were presented under the middle of the back.
The Ceratosaurus could have competed with Allosaurus and Torvosaurus for the same prey (giant sauropods Diplodocus, Apatosaurus and Camarasaurus), but this was smaller by about 6 to 8 meters in length, 2.5 in height, and weighing from 500 kg to 1 tonne would have an ecological niche occupied separately from their larger cousins. Moreover, the Ceratosaurus had a longer body and supple, with a tail shaped like a crocodile. This suggests that was a better swimmer and Torvosaurus Allosaurus. A recent study showed that Robert Bakker Ceratosaurus dams usually hunted waterfowl, such as fish and reptiles, but also had great potential to feed on dinosaurs. The study also indicates that adults and juveniles sometimes ate together. This evidence is, of course, very debatable and Ceratosaurus teeth marks are very common in large dams fossils of dinosaurs on land. Another common theory is that the Ceratosaurus has preyed primarily on Dryosaurus, Camptosaurus, and other ornithopods, since it seems a Lonely Hunter adults unable to break down sauropods. An alternative is that the ceratosaur eat carrion of large bodies of sauropods, displacing small small predators.
Ceratosaurus ("lagarto cornudo") que vivieron a finales del período Jurásico, hace aproximadamente 152 y 145 millones de años, en el Kimeridgiano y el Titoniano, en lo que hoy es Norteamérica, África y posiblemente en Europa.