Sceloporus undulatus, commonly known as the eastern fence lizard, is a species of lizard found along the eastern United States. Synonyms for Sceloporus undulatus include Barisia undulata, Cnemidophorus undulatus, Holbrookia undulata, Lacerta undulata and numerous others. While all of these names refer to the same species, they may have been given at different times by different researchers or taxonomists. It is important to keep updated with the current accepted synonym for any species to avoid confusion and ensure accurate communication amongst scientists and researchers.