Rapator belongs to the family of carnosaurian dinosaurs , which found existed in the Aptian age of the early Cretaceous period, over 105 million years ago. The fossil remains of the species were recovered in Australia, New South Wales - Griman Creek Formation. This carnivore species comes under the classification of Chordata, Reptila, Dinosauria, Saurischia, Theropoda, Megaraptora.
The species was named by Friedrich von Huene in 1932. The preserved holotype, BMNH R3718 is the known part of collection of this species that consists of a single left hand bone. The bone has a length of seven centimeters and on its upper end there is only one cotyle, this observation made the species to be of a metacarpal morphology. From the known skeletal structure it is estimated that the body size of Rapator would be up to 9 meters long.