Richardoestesia belongs to the family of theropod dinosaur that has been found lived in the Campanian age of late Cretaceous Period, over 75 million years ago. The fossil remains of the species were recovered in Canada - Alberta - Judith River Formation, Horseshoe Canyon Formation and Scollard Formation. USA - Wyoming - Lance Formation, Texas-Aguja Formation, and possibly Utah - Cedar Mountain Formation. This carnivore species comes under the classification of Chordata, Reptilia, Dinosauria, Saurischia, Theropoda, Dromaeosauridae.
The species was named by Phillip Currie, John Keith Rigby & Robert Evan Sloan in 1990. The preserved holotype NMC 343 is the known part of collection of this species that consists of the pair of lower jaws. The jaws are short and trim and had very finely serrated teeth with five to six denticles per millimeter. The skeletal structure, length and weight of Richardoestesia still remain unpredicted due to lack of fossil material.