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Xyrospondylus; Temporal range: Late Carboniferous, Pennsylvanian (Missourian); ~302 Ma PreꞒ Ꞓ O S D C P T J K Pg N ↓
	Holotype cervical vertebra at the University of California Museum of Paleontology
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Family:	†Edaphosauridae
Genus:	†Xyrospondylus; Reisz, Heaton & Pynn, 1982
Type species
	†Edaphosaurus ecordi; Peabody, 1957

Xyrospondylus is an extinct genus of non-mammalian synapsids belonging to the Edaphosauridae.^[1]^[2] The type species, X. ecordi,^[3] was named in 1982;^[4] it was originally named as a species of Edaphosaurus in 1957.^[5]

It lived during the Pennsylvanian (Missourian) in Kansas and possibly also Colorado^[6] 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.

References

^ 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
^ "Xyrospondylus". Paleofile. Retrieved 21 May 2015.
^ 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
^ F. E. Peabody. 1957. Pennsylvanian Reptiles of Garnett, Kansas: Edaphosaurs. Journal of Paleontology 31(5):947-949 [J. Mueller/T. Liebrecht]
^ R. L. Carroll. 1988. Vertebrate Paleontology and Evolution 1-698 [A. Behrensmeyer/A. Behrensmeyer/M. Uhen]