Parareptilia is a group of reptiles that includes ancient species closely related to modern reptiles. They are characterized by their unique skull structure and body features, which distinguish them from other reptilian groups. This clade is primarily known from the fossil record, showcasing a variety of forms that lived during the Paleozoic and Mesozoic eras. Members of Parareptilia include early reptiles like Procolophon and Pareiasaurus. These creatures played a significant role in the evolution of reptiles, contributing to the diversity seen in later groups. Their adaptations allowed them to thrive in various environments, making them important for understanding reptilian history.