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| Deinosuchus rugosus | |
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| Tweet Topic Started: Jan 8 2012, 01:55 PM (13,448 Views) | |
| Super Kaizer Ghidorah | May 15 2013, 05:44 AM Post #16 |
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Autotrophic Organism
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11 tons is good. |
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| SpinoInWonderland | May 15 2013, 11:03 PM Post #17 |
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The madness has come back...
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No. That's exaggerated. |
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| Super Kaizer Ghidorah | May 16 2013, 12:36 AM Post #18 |
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Autotrophic Organism
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I don't think so. |
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| SpinoInWonderland | May 16 2013, 04:55 PM Post #19 |
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The madness has come back...
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Then show me a source for that. |
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| Super Kaizer Ghidorah | May 17 2013, 01:09 AM Post #20 |
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Autotrophic Organism
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prehistoric.wikia.com/wiki/Deinosuchus You better not think it's inacurrate |
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| Scalesofanubis | May 17 2013, 01:40 AM Post #21 |
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Omnivore
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Why? It sites no sources, and it isn't a scholarly journal or any such. Wikipedia tends to want you to site sources and is heavily invested in being accurate, having fact checkers and such. This site just seems to be someone posting stuff about prehistoric critters. Not bad, really, but I'm not seeing any reason to take their word over anyone else. Is there a way to keep this topic from becoming an endless "u'huh!/nu'uh!" war? |
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| SpinoInWonderland | May 17 2013, 01:41 AM Post #22 |
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The madness has come back...
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prehistoric.wikia can be edited by anyone, also that site contains nonsense such as: [/color]
Really? Try better sources...check your sources before citing them... Edited by SpinoInWonderland, May 17 2013, 01:43 AM.
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| Super Kaizer Ghidorah | May 17 2013, 03:29 AM Post #23 |
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Autotrophic Organism
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But how could someone do that? |
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| Super Kaizer Ghidorah | May 17 2013, 06:08 AM Post #24 |
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Autotrophic Organism
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http://upload.wikimedia.org/wikipedia/commons/d/d8/Deinosuchus_size_estimate_comparison_chart.svg Count the square and you will see that deino did grew up to 15 meters. Edited by Super Kaizer Ghidorah, May 17 2013, 06:08 AM.
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| Scalesofanubis | May 17 2013, 10:23 AM Post #25 |
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Omnivore
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That is a sixty year old maximum size estimate, which the chart says. The newer estimates have rather more data, so are probably more accurate. My gut says that the 2002 estimate is too conservative, but I could be wrong as I haven't seen the data. |
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| tripoliraider | May 24 2013, 07:53 AM Post #26 |
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Unicellular Organism
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I would say the estimate by Brochu (10 meters~5 tons) is still valid. A 12 meter specimen as mentioned by Schwimmer in his book would probably weigh around 7 tons but there are only fragmentary evidence that such a monster existed. Jorge Moreno Bernal estimated that the biggest Purussaurus brasiliensis (DGM 527-R) had a max TL of 10.28 meters and a BM of 5128 kg. Even if Purussaurus was (probably) a little bit more massive than Deinosuchus, those figures give us a good idea of how big those animals were.
Edited by tripoliraider, May 24 2013, 07:56 AM.
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| Taipan | May 5 2014, 05:59 PM Post #27 |
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Administrator
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Spinning Slayers: Giant Crocs Used 'Death Rolls' to Kill Dinosaurs By Charles Q. Choi, Live Science Contributor | May 04, 2014 10:48am ET ![]() New research suggests Deinosuchus, a crocodilian from North America that could reach a length of 39.3 feet (12 m) and weighed more than 18,740 lbs. (8,500 kg), could take down dinosaurs with so-called death rolls. Ancient giant crocodilians killed dinosaur prey by spinning their bodies in "death rolls," tearing off the beasts' flesh and limbs, researchers say. These new findings shed light on the way ancient reptiles interacted with their environments, scientists added. Crocodilians include the largest of all reptiles alive today, the saltwater crocodile, a deadly carnivore that can grow at least 23 feet (7 meters) long and weigh more than 2,200 lbs. (1,000 kilograms). These predators will eat just about anything they can, including sharks. (Although these reptiles do kill people, far more people die of bee stings each year than crocodile attacks.) As massive as saltwater crocodiles are, their ancient relatives could get even larger. Sarcosuchus from Africa and South America could reach about 37.7 feet (11.5 m) long and weigh a whopping 17,635 lbs. (8,000 kg); Deinosuchus from North America could reach a length of 39.3 feet (12 m) and weigh more than 18,740 lbs. (8,500 kg); and Purussaurus from the Amazon basin could reach more than 42.6 feet (13 m) long and at least 22,000 lbs. (10,000 kg). Bite marks found on fossils suggest that Deinosuchus preyed on dinosaurs such as hadrosaurs, which were large duck-billed dinosaurs, and medium-size bipedal dinosaurs known as theropods, a group that includes Tyrannosaurus rex and the ancestors of birds. Scientists have suggested that Sarcosuchus might also have fed on large dinosaurs, while Purussaurus hunted large mammals such as giant rodents, as well as turtles and fish. Researchers suggested that like modern crocodilians, these ancient reptiles might have used death rolls to finish off their prey. This lethal move involves reptiles holding their prey tight with their mighty jaws and spinning their entire bodies to rip off flesh or tear off limbs. However, the death roll can generate substantial forces in the skull. To see if ancient crocs had skulls that were strong enough to withstand these stresses, investigators modeled the skulls of 16 living crocodilian species and three extinct crocodilian groups. The researchers suggest that Deinosuchus and Purussaurus could execute death rolls on, respectively, dinosaurs and large mammals. However, narrow-snouted Sarcosuchus probably could not, as the forces to its skull may have been too great. The scientists found that death rolls were easier for smaller predators, because they were lighter, making it easier for them to spin. This means it was probably easier for juveniles than adults, said lead study author Ernesto Blanco, a paleobiomechanicist at the Institute of Physics in Montevideo, Uruguay. "It is possible that very large specimens use other approaches for taking chunks of meat from large vertebrates," Blanco said -- for example, with sideways movements of the head. They may have also simply swallowed small prey whole. The researchers did note their model had several uncertainties, as "we are studying much larger crocs than any living species," Blanco told Live Science. This means "we cannot completely exclude 'death roll' in Sarcosuchus." The scientists detailed their findings online April 16 in the journal Historical Biology. http://www.livescience.com/45342-crocs-killed-dinosaurs-with-death-rolls.html The ‘death roll’ of giant fossil crocodyliforms (Crocodylomorpha: Neosuchia): allometric and skull strength analysis DOI:10.1080/08912963.2014.893300 Rudemar Ernesto Blancoac, Washington W. Jonesbc & Joaquín Villamilbc* Received: 14 Oct 2013 Accepted: 7 Feb 2014 Published online: 16 Apr 2014 Abstract In the evolution of crocodylomorphs, there were at least three giant-dimension genera: Deinosuchus from late Cretaceous of North America, Sarcosuchus from middle Cretaceous of Africa and South America, and Purussaurus from Miocene of South America. It has been suggested that these predators could have fed on very large prey as dinosaurs and megamammals. The ‘death roll’ is a spinning manoeuver executed to subdue and dismember large prey; therefore, it has been previously suggested that giant cocrodylomorphs may have used this manoeuver. However, this manoeuver can generate torsional stresses in the skull. We propose a biomechanical model to estimate the capability of a crocodylomorphs for withstanding this torsional stresses. Our results show a good correlation between a ‘death roll’ capability indicator and the feeding categories related with the actual use of ‘death roll’ in 16 living species. Here, for the first time, we propose a biomechanical approach of the implications of ‘death roll’ in fossil crocodylomorphs. We suggest that Deinosuchus and Purussaurus were able to execute death roll over dinosaurs and large mammals, respectively, but Sarcosuchus probably was not. We also found some allometry effects and, finally, we discuss palaeobiological implications based on our results. http://www.tandfonline.com/doi/abs/10.1080/08912963.2014.893300#.U2dHzq2SzVs Edited by Taipan, Dec 29 2017, 01:40 PM.
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