Data from: An exceptionally preserved Jurassic skink suggests lizard diversification preceded fragmentation of Pangaea

The present distribution of lizards is usually explained as a result of relatively recent global events, i.e. faunal turnovers or exchanges within and between particular continents mostly connected with glaciations and land-bridges. However, today's disjunct distribution of the North American Xantusiidae and African Cordyliformes (close relatives of skinks) does not fit generally accepted biogeographic patterns. A new exquisitely preserved specimen of the Late Jurassic lizard Ardeosaurus brevipes from the Solnhofen area, Germany sheds some light on the problem. A posterior projection of its parietal is known only in the Dibamidae, Gekkota, and Scincoidea, taxa representing first branches on the molecular tree of lizards. The projection of the parietal is proposed to be an apomorphy of the Squamata that was lost in the common ancestor of Lacertoidea and Toxicofera (snakes, anguimorphs and iguanians). This implies a basalmost position of A. brevipes on the Squamata tree. The location of the supratemporal such as in A. brevipes characterizes all the Scincoidea and some geckos, but most geckos lack osteoderms, which are common in Scincoidea. This makes A. brevipes the oldest known crown-member of this lineage. Moreover, this indicates that the main groups of modern lizards were present already in the Jurassic. Ancestors of Cordyliformes migrated to Gondwana in the Late Jurassic together with dinosaurs, prior to the Cretaceous separation of this ancient continent.GauthierMatrixTNT1st2ndAnalysisTNT file including dataset made by Gauthier et al. (2012). Taxa added: Slavoia darevskii, Cryptolacerta hassiaca, Ardeosaurus brevipes, Yabeinosaurus robustus. This file was used for the1st and 2nd analysis.GauthierMatrixTNT3rdAnalysisTNT file including dataset made by Gauthier et al. (2012) modified by Simoes et al. (2017). Taxa added: Slavoia darevskii, Cryptolacerta hassiaca, Ardeosaurus brevipes, Yabeinosaurus robustus. This file was used for the 3rd analysis.Talanda1stAnalysisThe strict consensus tree of the first analysis (matrix and settings from Gauthier et al. [2012]).Talanda2ndAnalysisImpliedWeightingThe most parsimonious tree of the second analysis (matrix from Gauthier et al. [2012] analyzed under implied weighting algoritm).Talanda_3rd_analysisThe majority rule (cut off 50) consensus tree of the third analysis (matrix and settings from Simões et al. [2017]).Funding provided by: National Science FoundationCrossref Funder Registry ID: http://dx.doi.org/10.13039/100000001Award Number: 2014/13/N/NZ8/02467 founded by National Science Centre