Thành viên:Khủng Long/Allosaurus

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Allosaurus /ˌæl[invalid input: 'ɵ']ˈsɔːrəs/ is a genus of large theropod dinosaur that lived 155 to 150 million years ago during the late Jurassic period (Kimmeridgian to early Tithonian[1]). The name "Allosaurus" means "different lizard". It is derived from the Greek /ˌæl[invalid input: 'ɵ']ˈsɔːrəs//allos ("different, other") and /ˌæl[invalid input: 'ɵ']ˈsɔːrəs//sauros ("lizard / generic reptile"). The first fossil remains that can definitely be ascribed to this genus were described in 1877 by paleontologist Othniel Charles Marsh, and it became known as Antrodemus. As one of the first well-known theropod dinosaurs, it has long attracted attention outside of paleontological circles. Indeed, it has been a top feature in several films and documentaries about prehistoric life.

Description[sửa | sửa mã nguồn]

The size range of Allosaurus and possible synonym Epanterias (largest), compared with a human.

Allosaurus was a typical large theropod, having a massive skull on a short neck, a long tail and reduced forelimbs. Allosaurus fragilis, the best-known species, had an average length of 8,5 m (28 ft)[chuyển đổi: số không hợp lệ],[2] with the largest definitive Allosaurus specimen (AMNH 680) estimated at 9.7 meters long (32 ft),[3] and an estimated weight of 2.3 metric tons (2.5 short tons).[3] In his 1976 monograph on Allosaurus, James Madsen mentioned a range of bone sizes which he interpreted to show a maximum length of 8,5 m (28 ft)[chuyển đổi: số không hợp lệ].[4] As with dinosaurs in general, weight estimates are debatable, and since 1980 have ranged between 8,5 m (28 ft)[chuyển đổi: số không hợp lệ], 8,5 m (28 ft)[chuyển đổi: số không hợp lệ], and 8,5 m (28 ft)[chuyển đổi: số không hợp lệ] for modal adult weight (not maximum).[5] John Foster, a specialist on the Morrison Formation, suggests that 8,5 m (28 ft)[chuyển đổi: số không hợp lệ] is reasonable for large adults of A. fragilis, but that 8,5 m (28 ft)[chuyển đổi: số không hợp lệ] is a closer estimate for individuals represented by the average-sized thigh bones he has measured.[6] Using the subadult specimen nicknamed "Big Al", researchers using computer modelling arrived at a best estimate of 8,5 m (28 ft)[chuyển đổi: số không hợp lệ] for the individual, but by varying parameters they found a range from approximately 8,5 m (28 ft)[chuyển đổi: số không hợp lệ] to approximately 8,5 m (28 ft)[chuyển đổi: số không hợp lệ].[7]

  1. ^ Turner, C.E. and Peterson, F., (1999).
  2. ^ Glut, Donald F. (1997). “Allosaurus”. Dinosaurs: The Encyclopedia. Jefferson, North Carolina: McFarland & Co. tr. 105–117. ISBN 978-0-89950-917-4.
  3. ^ a b Glut, Donald F. (1997). “Allosaurus”. Dinosaurs: The Encyclopedia. Jefferson, North Carolina: McFarland & Co. tr. 105–117. ISBN 978-0-89950-917-4.
  4. ^ Glut, Donald F. (1997). “Allosaurus”. Dinosaurs: The Encyclopedia. Jefferson, North Carolina: McFarland & Co. tr. 105–117. ISBN 978-0-89950-917-4.
  5. ^ Glut, Donald F. (1997). “Allosaurus”. Dinosaurs: The Encyclopedia. Jefferson, North Carolina: McFarland & Co. tr. 105–117. ISBN 978-0-89950-917-4.
  6. ^ Glut, Donald F. (1997). “Allosaurus”. Dinosaurs: The Encyclopedia. Jefferson, North Carolina: McFarland & Co. tr. 105–117. ISBN 978-0-89950-917-4.
  7. ^ Glut, Donald F. (1997). “Allosaurus”. Dinosaurs: The Encyclopedia. Jefferson, North Carolina: McFarland & Co. tr. 105–117. ISBN 978-0-89950-917-4.

[[Thể loại:Carnosauria]] [[Thể loại:Khủng long châu Âu]] [[Thể loại:Khủng long Bắc Mỹ]] [[Thể loại:Khủng long kỷ Jura]]

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