Family Edaphosauridae is a group of extinct reptiles that belong to the order Edaphosauria. These reptiles lived during the Late Pennsylvanian and Early Permian periods, which was about 307-270 million years ago. They were characterized by their small to medium-sized bodies and elongated tails that helped them move around on land. Some common synonyms for the family Edaphosauridae include the Edaphosaurids or Edaphosaurs. These terms are often used interchangeably to describe these reptiles and their unique characteristics. Although these species are now extinct, they played a crucial role in the evolution of land-dwelling vertebrates during the early days of the Permian period.