Astigmasaura is an extinct group of dinosaurs that lived during the Late Cretaceous period in what is now Argentina. This dinosaur belongs to a family called Rebbachisauridae, which are known for their long necks and large bodies.
The only known species of Astigmasaura is called Astigmasaura genuflexa. Scientists discovered its remains, which include parts of the skeleton, in 2017 in a place called the Huincul Formation, near an oil field in the northeastern part of Neuquén Province, Argentina.
The bones found are not complete but include many important pieces. This includes vertebrae (the bones that make up the spine), parts of the hip, and leg bones. Researchers have worked on studying these fossil remains and were able to describe this dinosaur in more detail in 2025.
The name Astigmasaura means “lizard without signs.” This name refers to its discovery location, which was named after how local farmers identify their animals. The specific name, genuflexa, means “bent knee,” which describes how the dinosaur’s legs were found positioned.
Astigmasaura was part of a larger group of rebbachisaurids. Researchers believe it is closely related to other dinosaurs like Itapeuasaurus and Sidersaura.
The Huincul Formation, where Astigmasaura was found, was home to many other dinosaurs and animals. This place was rich in different species, including other large dinosaurs called sauropods, as well as meat-eating dinosaurs. The environment during this time included a variety of plants and animals that contributed to a diverse ecosystem.
Overall, Astigmasaura is an important part of understanding dinosaur history and the variety of life that existed millions of years ago.