Maip belongs to a genus of large megaraptorid theropod dinosaur discovered in the Late Cretaceous (Maastrichtian) Chorrillo Formation in Santa Cruz, Argentina. Within this genus, there exists a sole species, M. macrothorax, which is known from an incomplete and disarticulated skeleton. Maip potentially holds the distinction of being the largest known megaraptorid from South America, and perhaps even in the world.

Maip is believed to have measured approximately 9 to 10 meters (30 to 33 ft) in length during its lifetime, potentially making it the largest known megaraptorid to date. Overall, members of the Megaraptoridae family experienced an increase in body length after the extinction of the carcharodontosaurids in the Southern Hemisphere during the early Late Cretaceous.

The authors interpreting the traces on the preserved ribs concluded that they served as attachment points for ligaments. Based on this observation, it was inferred that Maip probably possessed a respiratory system similar to that of modern birds, rather than resembling the respiratory systems of other living reptiles, like crocodilians.

The absence of these large apex predators is thought to have created an opportunity for other theropods to diversify and occupy the vacant niche space. Consequently, megaraptorids, abelisaurids, and unenlagiids emerged as the primary predators in their respective ecosystems.