Velocisaurus is classified within the clade Abelisauridae, the family Noasauridae, a group of theropod dinosaurs known for their specialized adaptations and distinctive cranial features. Fossils of Velocisaurus were uncovered in the Cañadón Asfalto Formation of Patagonia, Argentina. Its discovery has contributed to our understanding of the diverse predator fauna of the Jurassic.

Velocisaurus likely measured approximately 1.5 meters (4.9 feet) in length, as inferred from a tibia measuring 14 centimeters (5.5 inches) in length. This places it as the smallest noasaurid, following Berthasaura. Notably, its foot exhibits an exceptional trait: the central (third) metatarsal has transformed into the principal weight-bearing element. Specifically, its upper section has thickened, while the shafts of the adjacent second and fourth metatarsals have considerably reduced in thickness. This particular configuration remains unparalleled among other theropods, including avian species.

Scientists proposed an explanation for this adaptation, attributing it to a cursorial (running) lifestyle. This heightened agility would have been imperative for eluding larger theropods. Interestingly, they also posited that Velocisaurus might have been an omnivore, a conclusion drawn from the fact that the lone claw discovered, situated on the fourth toe, was not sharply curved but rather relatively straight.