Allosaurus is an extinct genus of large carnosaurian theropod dinosaur that lived 155 to 145 million years ago during the Late Jurassic period. The name "Allosaurus" means "different lizard", alluding to its unique concave vertebrae. It is derived from the Greek words ἄλλος and σαῦρος. The first fossil remains that could definitively be ascribed to this genus were described in 1877 by famed paleontologist Othniel Charles Marsh. As one of the first well-known theropod dinosaurs, it has long attracted attention outside of paleontological circles.
Allosaurus
Mounted A. fragilis specimen (AMNH 5753), posed as scavenging an Apatosaurus
AMNH 5753 in a Charles R. Knight life restoration (Outdated)
A. fragilis at the Cleveland-Lloyd Dinosaur Quarry museum, Utah
Carnosauria is an extinct group of carnivorous theropod dinosaurs that lived during the Jurassic and Cretaceous periods.
Carnosauria