Abelisaurus, named after Abel, is a predatory abelisaurid theropod dinosaur that roamed South America during the Late Cretaceous Period, specifically in the Campanian age. This bipedal carnivore is estimated to have been around 7.4 meters (about 24 feet and 3 inches) in length, although this measurement remains uncertain due to its limited representation, consisting of just one partial skull.

Estimating the size of Abelisaurus has been quite challenging due to our limited knowledge based solely on its skull remains. It's noteworthy that abelisaurids typically had relatively short skulls. The premaxilla, which is the bone at the front of the snout, carried four relatively small teeth. Just behind it, the maxilla featured at least seven, and potentially as many as thirteen, larger teeth. To create a full-body reconstruction of Abelisaurus, scientists have had to rely on information from other abelisaurid dinosaurs, which have become increasingly common in discoveries since the late 20th century.

Abelisaurus is generally envisioned as a medium to large-sized theropod dinosaur that walked on two legs. If we compare it to other theropod groups, it becomes evident that Abelisaurus, like other abelisaurids, had remarkably small and underdeveloped arms. Even when compared to tyrannosaurs, which are known for having relatively small arms, the abelisaurids likely had even less functional use for theirs. However, further examination of skull features in comparison to other abelisaurids has since indicated that Abelisaurus may actually be a more primitive or basal member of this group.