Difference between dinosaurs and reptiles
Avian dinosaurs
Velociraptor's tail was rigid, with long bony projections (zygoapophyses) at the top of each vertebra and ossified tendons beneath it. The prezygoapophyses began at the tenth caudal vertebra and extended forward to reinforce four to ten additional vertebrae, depending on the position of the tail. The stiffness reinforced the entire tail allowing it to act as a rod-shaped unit, preventing vertical movements between vertebrae. However, at least one specimen preserves a series of intact caudal vertebrae in an 'S' shaped curve, suggesting that there was considerable horizontal flexibility. These tail adaptations probably provide balance and stability when turning, especially at high speeds. It is a mechanism similar to, and in evolutionary convergence with, the cheetah tail.
A remarkable feature of Velociraptor is that it was covered with feathers. Not only was it covered with down, but it also had complex feathers on its forearms, similar to the rheems of today's birds. However, this curious animal was never able to fly.
What is the difference between dinosaurs and reptiles?
On the one hand, dinosaurs are called a type of reptile that laid eggs and lived on land but also had these skeletal features (we don't have much more than fossilized bones, so that's all we can look at):
What is the relationship between dinosaurs and reptiles?
According to this classification, dinosaurs are included in the reptile class because they evolved from reptiles. Primitive archosaurs were the direct ancestors of dinosaurs, but also of crocodiles, pterosaurs and birds!
What is a dinosaur and how does it differ from other prehistoric reptiles?
Dinosaurs belong to the group of reptiles that live out of water. From all these terrestrial reptiles they differ in the position of their limbs. Dinosaurs move upright, i.e. they have their legs under the body (like Tyrannosaurus rex), not to the sides (like crocodiles).
Evolution of birds
The plesiosaurs (Plesiosauria) are an order of sauropterygid sauropsids that appeared at the end of the Triassic period and lasted until the K-T extinction at the end of the Cretaceous, inhabiting all landmasses and continents. They are often mistakenly confused as "marine dinosaurs". After their discovery, they were humorously said to resemble a turtle with a snake threaded through its body.
Sauropsida Reptiles by continent Reptile families Reptile genera Reptiles by ocean Anapsida Reptile anatomy Annexes:Reptiles Diapsida Reptiles and humans Reptiles Extinct reptiles Marine reptiles Reptiles Reptiles by conservation status Reptiles by country Reptiles by region
Qué son los reptiles
En 1983, el cazador de fósiles William Walker descubrió una garra gigante en un pozo de ladrillos de Surrey. Un equipo de paleontólogos del Museo comenzó a investigar el lugar y pronto había desenterrado uno de los dinosaurios carnívoros más completos jamás encontrados en el Reino Unido.
Spinosaurus fue bautizado por el paleontólogo Ernst Stromer en 1915 y fue el primer espinosaurio del mundo, un dinosaurio de la familia Spinosauridae. Hoy es ampliamente conocido gracias, en parte, a su papel protagonista en Parque Jurásico III.
Durante mucho tiempo se supo relativamente poco sobre esta antigua criatura. Los primeros fósiles de Spinosaurus fueron destruidos por los bombardeos de la Segunda Guerra Mundial, lo que dejó a los paleontólogos con pocos fragmentos fósiles para estudiar.
La garra fosilizada era enorme, su lado curvo exterior medía 31 centímetros. Un equipo del Museo viajó a Surrey para seguir investigando. Entre mayo y junio de 1983, los paleontólogos excavaron un animal razonablemente completo que determinaron que era una nueva especie de dinosaurio.
A partir de la investigación inicial del esqueleto se determinó que, aunque el Baryonyx era claramente un terópodo carnívoro, en varios aspectos no se parecía a ninguno que se hubiera descubierto antes, como el Tyrannosaurus o el Megalosaurus.
Dinosaur chickens
The largest Pelicosaurus (herbivore). The Pelicosaurus group (Oden Pelycosauria) is a group of mammal-like reptiles that were mostly carnivorous. They lived from the late Carboniferous to the late Permian and were some of the most important faunal animals worldwide. Although it is an artificial grouping of organisms, it includes animals that in their external morphology are similar to each other and are generally basal synapsids. However, the largest herbivorous member of the group was Cotylorhynchus hancocki, over 4 m long and weighing 500 kg, belonged to the suborder Caseasauria and lived from the Lower to Middle Permian (272.5 to 265 Ma) in what is now southern North America.1
The largest Pelicosaurus (carnivore). The largest carnivorous pelicosaur of all was Dimetrodon grandis from the Lower to Middle Permian of North America. It was up to 3.20 m long and weighed up to 250 kg. This reptile had a large fin or sail on its back that supposedly functioned as a thermoregulator and was composed of the elongated neural spines of the vertebrae. This pelicosaur was also the largest carnivore in its environment.1