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]
| Xyrospondylus | |
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| Holotype cervical vertebra at the University of California Museum of Paleontology | |
| Scientific classification | |
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| Genus: | †Xyrospondylus |
| Type species | |
| †Xyrospondylus ecordi Reisz, Heaton & Pynn, 1982 (Peabody, 1957) | |
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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.