Post by DinosaurMichael on Jul 20, 2012 15:24:51 GMT -5
Megalodon - Carcharodon megalodon
Megalodon ( /ˈmɛɡələdɒn/ MEG-ə-lə-don; meaning "big tooth", from Greek μέγας (mega, "big") and ὀδούς (odon, "tooth")) is an extinct species of shark that lived roughly from 28 to 1.5 million years ago, during the Cenozoic Era (late Oligocene to early Pleistocene). The taxonomic assignment of C. megalodon has been debated for nearly a century, and is still under dispute with two major interpretations; Carcharodon megalodon (under family Lamnidae) or Carcharocles megalodon (under family Otodontidae). Consequently, the scientific name of this species has been commonly abbreviated to C. megalodon in literature. C. megalodon is regarded as one of the largest and most powerful predators in vertebrate history. C. megalodon likely had a profound impact on structuring of the marine communities. Fossil remains indicate that this giant shark reached a total length (TL) of more than 16 metres (52 ft), and also affirm that it had a cosmopolitan distribution. Scientists suggest that C. megalodon looked like a stockier version of the great white shark, Carcharodon carcharias, in life. Gottfried and colleagues (1996) also introduced a method to determine the body mass of the great white shark after studying the length–mass relationship data of 175 specimens at various growth stages and extrapolated it to estimate the body mass of C. megalodon. According to their model, a 15.9 metres (52 ft) long C. megalodon would have a body mass of about 47 metric tons (52 short tons), a 17 metres (56 ft) long C. megalodon would have a body mass of about 59 metric tons (65 short tons), and a 20.3 metres (67 ft) long C. megalodon would have a body mass of 103 metric tons (114 short tons). Consequently, C. megalodon is regarded as the largest shark ever to have lived, and is among the largest fish known to have existed.
Predator X
Predator X is an informal name for a prehistoric marine predator, thought by scientists to be a new species in the pliosaur family. A partial skull, a complete flipper and some assorted remains, including a section of vertebra of two individuals was excavated in mid-2008 in Svalbard, near the Arctic, by a Norwegian team led by Dr. Jørn Hurum. It is claimed by researchers to be the "most fearsome animal ever to swim in the oceans."The remains were discovered in June 2006 during a two-week expedition led by Dr. Hurum of the Natural History Museum at the University of Oslo. The team found 20,000 fragments of the creature's skeleton, which is being preserved and assembled at the museum. Due to the distribution pattern of pliosaurs, scientist believe that species were cosmopolitan, like some groups of modern-day whales. The remains are very close to that of Liopleurodon, an animal well known from several fairly complete skeletons. Using Liopleurodon as a guide, the Svalbard specimen is estimated to have been 15 metres (49 ft) long, 45,000 kilograms (99,000 lb) in weight and had teeth 30 centimetres (12 in) long. The jaws of the creature may have been able to exert more force than those of a Tyrannosaurus rex, with one news source stating the bite was over 10 times more powerful than any modern animal and four times more powerful than that of a Tyrannosaurus. It is estimated to have been alive approximately 147 million years ago. Analysis of bones from the four flippers suggest that the animal cruised using just two fore-flippers, using the back pair for extra speed when pursuing and capturing prey. Predator X's brain was of a similar type and size, proportionally, to that of today's great white shark, the team says. A television programme entitled Predator X first aired on History in 2009. It was also featured in the fourth episode of the BBC documentary series Planet Dinosaur in 2011, where it is shown hunting Kimmerosaurus, a smaller plesiosaur. The scene is based on damages to the one known skull of Kimmerosaurus, showing damage consistent with an attack of a very large animal with Liopleurodon-like dentition.
Megalodon ( /ˈmɛɡələdɒn/ MEG-ə-lə-don; meaning "big tooth", from Greek μέγας (mega, "big") and ὀδούς (odon, "tooth")) is an extinct species of shark that lived roughly from 28 to 1.5 million years ago, during the Cenozoic Era (late Oligocene to early Pleistocene). The taxonomic assignment of C. megalodon has been debated for nearly a century, and is still under dispute with two major interpretations; Carcharodon megalodon (under family Lamnidae) or Carcharocles megalodon (under family Otodontidae). Consequently, the scientific name of this species has been commonly abbreviated to C. megalodon in literature. C. megalodon is regarded as one of the largest and most powerful predators in vertebrate history. C. megalodon likely had a profound impact on structuring of the marine communities. Fossil remains indicate that this giant shark reached a total length (TL) of more than 16 metres (52 ft), and also affirm that it had a cosmopolitan distribution. Scientists suggest that C. megalodon looked like a stockier version of the great white shark, Carcharodon carcharias, in life. Gottfried and colleagues (1996) also introduced a method to determine the body mass of the great white shark after studying the length–mass relationship data of 175 specimens at various growth stages and extrapolated it to estimate the body mass of C. megalodon. According to their model, a 15.9 metres (52 ft) long C. megalodon would have a body mass of about 47 metric tons (52 short tons), a 17 metres (56 ft) long C. megalodon would have a body mass of about 59 metric tons (65 short tons), and a 20.3 metres (67 ft) long C. megalodon would have a body mass of 103 metric tons (114 short tons). Consequently, C. megalodon is regarded as the largest shark ever to have lived, and is among the largest fish known to have existed.
Predator X
Predator X is an informal name for a prehistoric marine predator, thought by scientists to be a new species in the pliosaur family. A partial skull, a complete flipper and some assorted remains, including a section of vertebra of two individuals was excavated in mid-2008 in Svalbard, near the Arctic, by a Norwegian team led by Dr. Jørn Hurum. It is claimed by researchers to be the "most fearsome animal ever to swim in the oceans."The remains were discovered in June 2006 during a two-week expedition led by Dr. Hurum of the Natural History Museum at the University of Oslo. The team found 20,000 fragments of the creature's skeleton, which is being preserved and assembled at the museum. Due to the distribution pattern of pliosaurs, scientist believe that species were cosmopolitan, like some groups of modern-day whales. The remains are very close to that of Liopleurodon, an animal well known from several fairly complete skeletons. Using Liopleurodon as a guide, the Svalbard specimen is estimated to have been 15 metres (49 ft) long, 45,000 kilograms (99,000 lb) in weight and had teeth 30 centimetres (12 in) long. The jaws of the creature may have been able to exert more force than those of a Tyrannosaurus rex, with one news source stating the bite was over 10 times more powerful than any modern animal and four times more powerful than that of a Tyrannosaurus. It is estimated to have been alive approximately 147 million years ago. Analysis of bones from the four flippers suggest that the animal cruised using just two fore-flippers, using the back pair for extra speed when pursuing and capturing prey. Predator X's brain was of a similar type and size, proportionally, to that of today's great white shark, the team says. A television programme entitled Predator X first aired on History in 2009. It was also featured in the fourth episode of the BBC documentary series Planet Dinosaur in 2011, where it is shown hunting Kimmerosaurus, a smaller plesiosaur. The scene is based on damages to the one known skull of Kimmerosaurus, showing damage consistent with an attack of a very large animal with Liopleurodon-like dentition.