[13][15] A study of skull elements from the Cleveland-Lloyd site found wide variation between individuals, calling into question previous species-level distinctions based on such features as the shape of the lacrimal horns, and the proposed differentiation of A. jimmadseni based on the shape of the jugal. Stress fractures and tendon avulsions occurring in the forelimb have special behavioral significance since while injuries to the feet could be caused by running or migration, resistant prey items are the most probable source of injuries to the hand. ), #mc_embed_signup{background:#fff; clear:left; font:14px Helvetica,Arial,sans-serif; }
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Although Allosaurus did not have saber teeth, Bakker suggested another mode of attack that would have used such neck and jaw adaptations: the short teeth in effect became small serrations on a saw-like cutting edge running the length of the upper jaw, which would have been driven into prey. The forelimbs of Allosaurus were short in comparison to the hindlimbs (only about 35% the length of the hindlimbs in adults)[26] and had three fingers per hand, tipped with large, strongly curved and pointed claws.

The same interpretation applies to Bakker's lair sites. [22] Likewise, "Labrosaurus fragilis" is a typographical error by Marsh (1896) for Labrosaurus ferox. The location of the bone in the body (along the bottom margin of the torso and partially shielded by the legs), and the fact that it was among the most massive in the skeleton, indicates that the Allosaurus was being scavenged.[143]. The name "Allosaurus" means "different lizard" alluding to its unique concave vertebrae (at the time of its discovery). It averaged 9.5 meters (31 ft) in length, though fragmentary remains suggest it could have reached over 12 m (39 ft).

fragilis. These remains had been known as Saurophagus, but that name was already in use, leading Chure to propose a substitute. [70][90], A. tendagurensis was named in 1925 by Werner Janensch for a partial shin (MB.R.3620) found in the Kimmeridgian-age Tendaguru Formation in Mtwara, Tanzania.

[5] Based on histological analysis of limb bones, bone deposition appears to stop at around 22 to 28 years, which is comparable to that of other large theropods like Tyrannosaurus. When the researchers looked for stress fractures, they found that Allosaurus had a significantly greater number of stress fractures than Albertosaurus, Ornithomimus or Archaeornithomimus.

Lockley and co-authors in 1998 restricted the name Megalosauripus to label the footprints with distinct phalangeal pad impressions. [22] A 2010 study by Paul and Kenneth Carpenter, however, indicates that Epanterias is temporally younger than the A. fragilis type specimen, so it is a separate species at minimum.

Because of this, several scientists have interpreted the type specimen as potentially dubious, and thus the genus Allosaurus itself or at least the species A. fragilis would be a nomen dubium ("dubious name", based on a specimen too incomplete to compare to other specimens or to classify). Allosaurus var en kjøttetende dinosaurus i familien Theropoda/Allosauridae.Den kunne bli opp til 12 meter lang, og kunne gjenkjennes på sitt store hode på en kort nakke og på sin lange hale. It came from Middle Park, near Granby, Colorado, probably from Morrison Formation rocks. [118] However, as Gregory Paul noted in 1988, Allosaurus was probably not a predator of fully grown sauropods, unless it hunted in packs, as it had a modestly sized skull and relatively small teeth, and was greatly outweighed by contemporaneous sauropods. Suggestions have ranged from animals getting stuck in a bog, to becoming trapped in deep mud, to falling victim to drought-induced mortality around a waterhole, to getting trapped in a spring-fed pond or seep. The majority of bones belong to the large theropod Allosaurus fragilis (it is estimated that the remains of at least 46 A. fragilis have been found there, out of at a minimum 73 dinosaurs), and the fossils found there are disarticulated and well-mixed. Plateosaurus engelhardti. Each dentary (the tooth-bearing bone of the lower jaw) had between 14 and 17 teeth, with an average count of 16. However, there has been no official description of the remains and "Wyomingraptor" has been dismissed as a nomen nudum, with the remains referable to Allosaurus. Data from extant birds suggested that the medullary bone in this Allosaurus individual may have been the result of a bone pathology instead. [80] It was transferred to Chilantaisaurus in 1990,[81] but is now considered a nomen dubium indeterminate beyond Theropoda.

[11], "Allosaurus agilis", seen in Zittel, 1887, and Osborn, 1912, is a typographical error for A. [15] Kenneth Carpenter, using skull elements from the Cleveland-Lloyd site, found wide variation between individuals, calling into question previous species-level distinctions based on such features as the shape of the horns, and the proposed differentiation of A. jimmadseni based on the shape of the jugal. Allosaurus fragilis, the best-known species, had an average length of 8.5 m (28 ft), with the largest definitive Allosaurus specimen (AMNH 680) estimated at 9.7 meters (32 feet) long, and an estimated weight of 2.3 metric tons (2.5 short tons). [120] The original authors noted that Allosaurus itself has no modern equivalent, that the tooth row is well-suited to such an attack, and that articulations in the skull cited by their detractors as problematic actually helped protect the palate and lessen stress. [41] For example, Williston pointed out in 1901 that Marsh had never been able to adequately distinguish Allosaurus from Creosaurus. According to their biomechanical analysis, the skull was very strong but had a relatively small bite force. The authors conclude that these fractures occurred during interaction with prey, like an allosaur trying to hold struggling prey with its feet. [99] Similarly, Yoichi Azuma and Phil Currie, in their description of Fukuiraptor, noted that the bone closely resembled that of their new genus. [68], Allosaurus sibiricus was described in 1914 by A. N. Riabinin on the basis of a bone, later identified as a partial fourth metatarsal, from the Early Cretaceous of Buryatia, Russia. These differences suggest that younger Allosaurus were faster and had different hunting strategies than adults, perhaps chasing small prey as juveniles, then becoming ambush hunters of large prey upon adulthood.

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