by George Olsen
Top hit from: 07.02 to 20.03.1926
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Alectrosaurus ( /əˌlɛktrɵˈsɔrəs/; meaning "unmarried lizard") is a genus of tyrannosaurid theropod dinosaur from the Late Cretaceous Period of Inner Mongolia. It was a bipedal carnivore with a body shape similar to its much larger relative, Tyrannosaurus rex. Alectrosaurus was much smaller though, most likely less than five meters (17 ft) long.
The generic name Alectrosaurus can also be translated as "alone lizard," and is derived from the Greek words alektros ("unmarried") and sauros ("lizard"). At the time of its discovery, it was unlike any other Asian carnivore known. There is one named species (A. olseni), which is named in honor of George Olsen, who discovered the first specimens in 1923 on the third American Museum of Natural History expedition to Mongolia. Both genus and species were named by American paleontologist Charles Gilmore in 1933. In a 2001 study conducted by Bruce Rothschild and other paleontologists, 23 foot bones referred to Alectrosaurus were examined for signs of stress fracture, but none were found.
The holotype (AMNH 6554), or name-bearing specimen, of Alectrosaurus is a hind limb discovered in the Iren Dabasu Formation of the Inner Mongolia
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