obtained Allosaurus jimmadseni ancient DNA from blood-drinking invertebrates such as mosquitoes preserved in late Jurassic amber samples. More questionable remains have been presented from Siberia and China. Some possible remains have been reported from the Tendaguru Formation in Tanzania, though these are no longer thought to belong to Allosaurus or any allosaur. Two other species, Allosaurus amplus and Allosaurus lucasi, are known from North America as well. fragilis aside from their age, these two can be told apart by the straight lower margin of the cheekbone on Allosaurus jimmadseni. In 2020 the species Allosaurus jimmadseni was identified from the Morrison Formation in older rocks than A. Allosaurus europaeus was identified from the Lourinhã Formation in Portugal in 2006. While the most common species by far is Allosaurus fragilis with over seventy individuals known, there are several other species. Since then, paleontologists have identified many Allosaurus fossils from the Morrison Formation, giving modern science a large body of knowledge about this animal remains were also found in Montana, New Mexico, Oklahoma, Wyoming, South Dakota, and Utah. Gilmore clarified many of Cope and Marsh’s findings and consolidated numerous fossil genera into Allosaurus. Due to the intense competition between Marsh and his rival Edward Drinker Cope, many Allosaurus specimens went undescribed during the late 1870s and 1880s. They were variously assigned to several preexisting genera of dinosaur until paleontologist Othniel Charles Marsh named them in 1877 during the Bone Wars. The earliest fossils of Allosaurus were tail vertebrae found in the Morrison Formation of Colorado by geologist Ferdinand Vandeveer Hayden in 1869, who sent them to Joseph Leidy for study. jimmadseni, which is named in honor of paleontologist James Henry Madsen. However, the species that was cloned by International Genetic Technologies is now believed to be A. The genus name Allosaurus describes the concave shape of its vertebrae, which was unique when the animal was first identified in 1877. fragilis the species name references the fragile nature of its fossilized remains.
It lived during the Kimmeridgian and Tithonian ages of the late Jurassic period, approximately 155 to 145 million years ago, and is known from western North America as well as Portugal and potentially other parts of the world. Allosaurus, meaning “different reptile,” is a genus of large carnivorous theropod dinosaur in the family Allosauridae.
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