†Xyrospondylus Reisz et al. 1982 (pelycosaur)
Full reference: R. R. Reisz, M. J. Heaton, and B. R. Pynn. 1982. Vertebrate Fauna of Late Pennsylvanian Rock Lake Shale near Garnett, Kansas: Pelycosauria. Journal of Paleontology 56(3):741-750
Parent taxon: Pelycosauria according to R. R. Reisz et al. 1982
Sister taxa: Bathygnathus, Caseamorpha, Caseasauria, Clepsydropidae, Edaphosauria, Luperosaurus, Milosaurus, Nitosaurus, Ophiacodontia, Protoclepsydrops, Scoliomus, Thalattosauria, Trichasaurus
Subtaxa: Xyrospondylus ecordi
Type: Edaphosaurus ecordi
Ecology: