Aucasaurus

Filed under Cretaceous dinosaurs · Types of Dinosaurs editorial team

Order: Saurischia · Suborder: Theropoda · Infraorder: Abelisauridae · Family: Abelisauridae

Aucasaurus, whose name means "Auca lizard," was a carnivorous dinosaur that lived during the Late Cretaceous period in what is now Argentina. This mid-sized predator measured between 13 and 14 feet in length, making it a nimble hunter rather than a massive apex predator. As a member of the abelisaurid family, Aucasaurus shared distinctive anatomical features with its relatives, including a short, deep skull adapted for powerful biting. Its forelimbs were extremely reduced—even more diminished than those of many other abelisaurs—leaving the jaws as its primary weapon for capturing and killing prey.

The significance of Aucasaurus extends beyond its individual characteristics. The dinosaur is known from a relatively complete skeleton, making it an exceptionally valuable reference for paleontologists studying abelisaurid anatomy and evolution. Its discovery near a site famous for preserving sauropod nesting grounds provides insights into the predator-prey relationships and ecosystem dynamics of its time. The quality and completeness of the fossil record for Aucasaurus has established it as an important benchmark for understanding how this unique family of theropods hunted and thrived millions of years ago.

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Reference background: Natural History Museum, London — Dinosaurs; Smithsonian National Museum of Natural History — Dinosaurs; American Museum of Natural History — Dinosaurs & Fossils. Figures are typical published ranges; taxonomy follows the source era and modern consensus is noted where it differs. See our sources & fact-check policy.

Related dinosaurs

Other dinosaurs from the Abelisauridae family.