Parent taxon: Tetrapoda according to D. Marjanović and M. Laurin 2019
See also Carroll 1988, Carroll et al. 1972, Cope 1884, Kuhn 1946, Panchen 1970 and Watson 1919
Sister taxa: Acanthostegidae, Aistopoda, Amphibia, Antlerpeton, Austrobrachyops, Austrobrachyops jenseni, Aytonerpeton, Baphetoidea, Brittagnathus, Caerorhachidae, Casineria, Characichnos, Chroniosuchia, Collettosaurus, Colosteidae, Crassigyrinidae, Crucipes, Diploradus, Dipodiscus, Doragnathus, Eldeceeon, Erpetopus, Gaiasia, Hemispondyla, Janusichnus, Janusichnus bifrons, Kirktonecta, Koilops, Laoporus, Limnosceloides, Limnosceloides brachycoles, Limnosceloides dunkardensis, Lunaepes, Merifontichnus, Mesanerpeton, Microsauropus, Miosauria, Namuncurania malarguense, Nasopus grimmi, Nothosaurops occiduus, Ossirarus, Paleosauropus, Parmastega, Perittodus, Plesiosaurus vaccinsulensis, Polyptychodon mackesoni, Reniformichnus, Reptiliomorpha, Romeriscus, Romeriscus periallus, Saurichnium parallelum, Sigournea, Silvanerpeton, Solenodonsaurus, Solidopus, Solidopus perissodactylus, Tambachichnium, Tantallognathus, Tetrapodium, Thecodontichnus, Theriodesmus, Typopus, Wangwusaurus, Wangwusaurus tayuensis, Westlothiana, Whatcheeriidae
Subtaxa: Anthracosauridae Archeriidae Eogyrinidae Loxommatoidea Proterogyrinidae Seroherpeton
Ecology:
Distribution:
• Rotliegendes of United States (1: New Mexico collection)
• Permian of China (1), the Russian Federation (1), United States (13: New Mexico, Oklahoma, Texas)
• Namurian of United States (1: Arkansas)
• Carboniferous of Canada (4: Nova Scotia), Czechia (2), the United Kingdom (12), United States (9: Illinois, Iowa, New Mexico, Ohio, Texas, West Virginia)
Total: 44 collections including 53 occurrences