Name: Acrocanthosaurus‭ (‬High spined lizard‭)‬. Phonetic: Ak-row-can-fo-sore-us. Named By: John Willis Stovall‭ & ‬Wann Langston,‭ ‬Jr.‭ ‬-‭ ‬1950. Classification: Chordata,‭ ‬Reptilia,‭ ‬Dinosauria,‭ ‬Saurischia,‭ ‬Theropoda,‭ ‬Carcharodontosauridae. Species: A.‭ ‬atokensis‭ (‬type‭)‬. Type: Carnivore.‭  Size: Up to‭ ‬11.5‭ ‬meters long. Known locations: USA,‭ ‬Oklahoma,‭ ‬Antlers Formation,‭ ‬and the Texas,‭ ‬Twin Mountains Formation.‭ ‬Some specimens from other parts of the US. Time period: Aptian to Albian of the Cretaceous. Fossil representation: Several specimens of partial remains.‭ ‬Combined study of all these specimens has allowed Acrocanthosaurus to be very well reconstructed.

Acrocanthosaurus immediately‭ ‬sticks out from other large theropods with its high dorsal spines than run from the neck to the tip of the tail.‭ ‬There have been many artistic representations for this structure from the spines standing proud from the body,‭ ‬to supporting a flap of skin.‭ ‬Modern thinking however comes from the examination of the lower spines that have attachments for muscles.‭ ‬This has led to the suggestion that the spines supported a hump of tissue that ran down the length of Acrocanthosaurus. The purpose of the hump of Acrocanthosaurus has been subject to a lot of speculation.‭ ‬Some have said that it would provide a larger surface area than Acrocanthosaurus would have had without it,‭ ‬helping with temperature exchange and reducing negative effects of gigantothermy.‭ ‬It could have been composed of fatty tissue and used to keepAcrocanthosaurus going for extended periods without eating.‭ ‬It may have also been a form of visual display for otherAcrocanthosaurs to gauge its level of health,‭ ‬perhaps even having a different colour or markings to the rest of its body. It is possible that the hump served double duty.‭ ‬If composed of fatty tissue,‭ ‬Acrocanthosaurus would have had to eat more than the minimum it would have had to just to survive.‭ ‬This would then result in a large and well maintained hump that would speak along the lines of‭ '‬Look at‭ ‬my hump.‭ ‬That is how much of a successful predator I am.‭ ‬That‭’‬s why I am more worthy of passing my genes down to the next generation‭'‬.‭ ‬It could have also worked in dominance displays between two Acrocanthosaurus,‭ ‬with the larger hump meaning that they were a more capable hunter‭ ‬and knew what to do when things came to a fight.‭ ‬The Acrocanthosaurus with the smaller hump would then probably back down instead of go up against what appeared to be a stronger and more capable Acrocanthosaurus.



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