Full reference: E. C. Olson. 1947. The Family Diadectidae and its Bearing on the Classification of Reptiles. Fieldiana: Geology 11(1):1-53
Parent taxon: Reptilia according to M. Laurin and R. R. Reisz 1995
See also Benton 1985, Olson 1947, Olson 1962, Olson and Barghusen 1962, Olson and Beerbower 1953 and Seltin 1959
Sister taxa: Amblyglossae, Anapsida, Anhomoiichnium, Anomodontia, Apatomerus, Archaeosauria, Atremata, Chelydosauria, Cunichnoides, Dimetropus, Diplotremata, Dipnoa, Dolichobrachium, Dravidosaurus, Dravidosaurus blanfordi, Embolophorus, Enaliosauria, Glauconia, Holosauria, Hyperosauria, Ichthyosaurus inexpectatus, Ischyrotherium, Isocampe, Kintneria, Lyognatha, Macelognatha, Metamosaurus, Monopnoa, Monotreta, Monozygocrotapha, Onychichnium, Oolithes, Ornithocephala, Pantestudines, Parareptilia, Pessopteryx arctica, Pessopteryx pinguis, Placodontomorpha, Plesiosaurus doedicomus, Poeciloglyptica, Polemarchus, Proganosauromorpha, Proreptilia, Prosauria, Protorosauria, Puercosaurus, Puercosaurus obtusidens, Rhamphosauria, Rhizodonta, Rhynchosauroidae, Saurichthys indicus, Saurophidia, Seps, Sillimanius, Squamata, Steropoides, Streptosauria, Svalbardosaurus, Svalbardosaurus crassidens, Testudinata, Theromorpha, Tocosauria
Subtaxa: Captorhina Captorhinidae Parapsida Protorothyrididae Romeriida Thuringothyris
Ecology: