Alectosaurus (Greek, "alone lizard") was a Primitive Tyrannosaurid from Late Cretaceous China and Mongolia, around 83 to 74 mya.  It was a small tyrannosaurid; which was 16.4 ft (5m) long, 8 ft (2.5 m) in height and weighed 1000 lbs.  It is only known from a partial skeleton, and is likely a primitive fast-running tyrannosaurid. Its fossil was found in the Gobi Desert in Mongolia. It had sharp teeth, and was a bipedal carnivore.

It was named after a mythical deity, Alectra, by C. W. Gilmore in 1933.

  • Scientific Name: Alectrosaurus olseni. 


  • Alectrosaurus Makes its first media appearance in the final episode of Planet Dinosaur. As a pack of Alctorsaurus'es were shown to fight against a pair of Gigantoraptors to got into their nest and; likely also for the territorrial reasons.