Full reference: E. D. Cope. 1869. On the reptilian orders Pythonomorpha and Streptosauria. Proceedings of the Boston Society of Natural History 12:250-266
Parent taxon: Squamata according to M. W. Caldwell et al. 2021
See also Comaschi Caria 1957, Cope 1869, Cope 1871, Cope 1875, Gadow 1898, Hay 1902, Hay 1930, Houssaye et al. 2013, Huene 1954, Jaekel 1910, Jaekel 1911, Lee et al. 1999, Lee and Caldwell 2000, Perrier 1928, Swinton 1934, Woodward 1898 and Zittel 1890
Sister taxa: Ameivoidea, Amphisbaenia, Anguimorpha, Anhuisaurus, Anomalopsis, Anqingosaurus, Araeoscelomorphi, Ardeosaurus, Asagaolacerta, Bavarisaurus, Changjiangosaurus, Cuencasaurus, Dibamidae, Draconoidea, Eichstaettisaurus, Episquamata, Gekkonomorpha, Hakuseps, Haplodontosaurus, Harpagosaurus excedens, Hongshanxi, Hoyalacerta, Huehuecuetzpalli, Iguana haueri, Iguanomorpha, Jucaraseps, Kuroyuriella, Lacertibaenia, Lacertilia, Liushusaurus, Macrocnemidae, Megachirella, Moqisaurus, Mosasauridae, Mosasauroidea, Oculudentavis, Olindalacerta, Ophidia, Oxiella, Paikasisaurus, Palaeophidae, Paleochelco, Pangekkota, Panscincoidea, Panxantusiidae, Panxenosaurus, Paraplacosauriops, Parasaurillus, Parviraptor, Pseudosaurillus, Sauripes, Scandensia, Scincogekkonomorpha, Scincoidea, Scincomorpha, Scleroglossa, Tedorosaurus, Thalattosauromorphi, Trachelosauridae, Vialorophis, Xestops gracilis, Yabeinosaurus, Yabeinosaurus youngi, Zanclodontidae
Subtaxa: Dolichosauri Dolichosauridae