Allosaurus is a genus of large carnivorous theropod dinosaur. It lived 155 to 145 million years ago during the late Jurassic period. It is classified as an allosaurid, a type of carnosaurian theropods. The bulk of Allosaurus remains have come from North America’s Morrison Formation.
About Allosaurus in brief
Allosaurus is a genus of large carnivorous theropod dinosaur. It lived 155 to 145 million years ago during the late Jurassic period. It is classified as an allosaurid, a type of carnosaurian theropods. The genus has a complicated taxonomy, and includes three valid species, the best known of which is A. fragilis. Allosaurus was a large bipedal predator. Its skull was light, robust and equipped with dozens of sharp, serrated teeth. It averaged 10 meters in length, though fragmentary remains suggest it could have reached over 12 m. Some paleontologists interpret Allosaurus as having had cooperative social behavior, and hunting in packs. Others believe individuals may have been aggressive toward each other, and that congregations of this genus are the result of lone individuals feeding on the same carcasses. The bulk of Allosaurus remains have come from North America’s Morrison Formation, with material also known from Portugal. It was known for over half of the 20th century as Antrodemus, but a study of the copious remains from the Cleveland-Lloyd Dinosaur Quarry brought the name \”Allosaurus\” back to prominence. Several gigantic specimens have been attributed to Allosaurus, but may in fact belong to other genera. A more recent discovery is a partial skeleton from the Peterson Morrison Quarry rocks of New Mexico of Saurophaganax, which may be another large allosaurus allosaurus. The most recent Allosaurus specimen was found by David K.
Smith, examining fossils by quarry, found that the smaller specimens are generally smaller than those from Como Bluff or Brigham Young University’s Dry Mesa Quarry. A later study by Smith found no consistent differences, although clump-related differences tended to clump together on the basis of clump clump material on the Dry Mesa and Dry Mesa Dry Mesa quarry sites, although the shapes of the bones themselves did not vary between the sites. It may have measured 12 1 meters length, once assigned to the genus Epanterias, may now be a separate genus, Allosaurus maximus, though recent studies support it as a separate species. It had a massive skull on a short neck, a long, slightly sloping tail and reduced forelimbs. The best-known species is Allosaurus Fragilis, with an average length of 8. 5 m, and an estimated weight of 2. 3 metric tons. Since 1980, weight estimates are debatable, and since 1980 have ranged between 1,500 kilograms, 1,000 to 4,000 kg, and 1,010 kilograms for modal adult weight. John Foster, a specialist on the Morrison Formation,. suggests that 1, thousand kg is reasonable for large adults of A. fragILis, but that 700 kg is a closer estimate for individuals represented by the average-sized thigh bones he has measured. In his 1976 monograph on Allosaurus,. James H. Madsen mentioned a range of bone sizes which he interpreted to show a maximum length of 12 to 13 m.