Xyrospondylus is an extinct genus of non-mammalian synapsids belonging to the Edaphosauridae.R. R. Reisz. 1986. Pelycosauria. Handbuch der Paläoherpetologie / Encyclopedia of Paleoherpetology 17A:1-102 [J. Mueller/J. Dummasch/T. Liebrecht]The main groups of non-mammalian synapsids at Mikko's Phylogeny Archive The type species, X. ecordi, was named in 1982;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 it was originally named as a species of Edaphosaurus in 1957.F. E. Peabody. 1957. Pennsylvanian Reptiles of Garnett, Kansas: Edaphosaurs. Journal of Paleontology 31(5):947-949 [J. Mueller/T. Liebrecht]
It lived during the Pennsylvanian (Missourian) in Kansas and possibly also ColoradoR. L. Carroll. 1988. Vertebrate Paleontology and Evolution 1-698 [A. Behrensmeyer/A. Behrensmeyer/M. Uhen] and the holotype is known from a single cervical vertebra found in the Stanton Formation. A second specimen, consisting of a fragmentary pelvis, is also known. A third specimen, known from Colorado, is known, but it probably does not pertain to Xyrospondylus.
See also List of pelycosaurs List of therapsids
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