The existence of both interspecific and intraspecific morphological and anatomical variation in vertebral intercentra is described for the first time in Lacertidae. A sample of 380 cleared-and-stained specimens of 12 species of lacertid lizards reveals also the presence of thoracolumbar intercentra in Lacertidae, a condition previously reported within Squamata only for the families Xantusiidae and Gekkonidae. The significance of these findings in the context of phylogenetic analyses within Squamata is discussed.