B. gonzalezorum, the most complete small theropod (carnivorous dinosaur) ever discovered in South America suggests that dromaeosaurs on northern and southern continents took different evolutionary routes, and proves that dromaeosaurs must have originated when all of the continents were still assembled in a single landmass during the Jurassic as far back as 180 million years ago--much earlier than previously thought. Buitreraptor is remarkably different than other domaeosaurs, most obviously due to its long, slender snout and relatively small, widely spaced teeth. Unlike most other theropods, the teeth of Buitrearaptor lack the steak-knife-like serrations along their edges.

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