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| Spinophorosaurus nigerensis v Acrocanthosaurus atokensis | |
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| Tweet Topic Started: Aug 3 2013, 10:14 PM (3,533 Views) | |
| Taipan | Aug 3 2013, 10:14 PM Post #1 |
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Spinophorosaurus nigerensis Spinophorosaurus (meaning 'spine-bearing lizard') is a genus of early sauropod dinosaur from Niger. It was recovered in a rock formation belonging to the lower part of the Irhazer Group, the age of which is unknown but may be Middle Jurassic or older. It is unusual for having spiked osteoderms, probably from the tail, similar to the famed thagomizer of stegosaurs. The type species, S. nigerensis, was described by Remes et al. in 2009. A study of its braincase showed that its neuroanatomy was in some ways intermediate between that of basal sauropodomorphs and that of neosauropods. Size est. Length: 14 meters: Height: 4 meters: Mass: 15 tonnes. ![]() Acrocanthosaurus atokensis Acrocanthosaurus is a genus of theropod dinosaur that existed in what is now North America during the Aptian and early Albian stages of the Early Cretaceous. Like most dinosaur genera, Acrocanthosaurus contains only a single species, A. atokensis. Its fossil remains are found mainly in the U.S. states of Oklahoma, Texas, and Arkansas, although teeth attributed to Acrocanthosaurus have been found as far east as Maryland. Acrocanthosaurus was a bipedal predator. As the name suggests, it is best known for the high neural spines on many of its vertebrae, which most likely supported a ridge of muscle over the animal's neck, back and hips. Acrocanthosaurus was one of the largest theropods, approaching 12 meters (40 ft) in length, and weighing up to 6–7 metric tons (6.5–7.5 short tons). Large theropod footprints discovered in Texas may have been made by Acrocanthosaurus, although there is no direct association with skeletal remains. Recent discoveries have elucidated many details of its anatomy, allowing for specialized studies focusing on its brain structure and forelimb function. Acrocanthosaurus was the largest theropod in its ecosystem and likely an apex predator which possibly preyed on large sauropods and ornithopods. ![]() ______________________________________________________________________________
Based on T-Rex v Spinophorosaurus thread, lets try Acrocanthosaurus first! Edited by Taipan, Aug 3 2013, 10:20 PM.
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| Taipan | Jan 16 2018, 11:40 PM Post #16 |
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Hi Acrocanthosaurus, I think most share your confidence in your user name in this matchup. |
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| Ausar | Jan 17 2018, 02:05 AM Post #17 |
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Xi-miqa-can! Xi-miqa-can! Xi-miqa-can!
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It should be noted that under further scrutiny, there is actually no evidence that Spinophorosaurus had a thagomizer.The specialized tail of Spinophorosaurus nigerensis (Sauropoda. Middle Jurassic) and the osteological limits on its range of motion In a way, I think most sauropods are some of those animals that may seem weaponless, but under further scrutiny actually do have surprisingly dangerous weapons...that I probably still won't rate over the weapons of some other similar sized, unambiguously well armed animals (I think horses, baleen whales, and at least most ratites also qualify). In this case, the latter is an elephant-sized, rather powerfully built predator with a ~130 centimeter skull filled with biological steak knives for teeth (although, there's a book by Kenneth Carpenter that claims that Fran's skull is 147.3 cm long; where did that come from?). Edited by Ausar, Jan 17 2018, 08:56 AM.
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