List of pelycosaurs explained

This list of pelycosaurs is an attempt to create a comprehensive listing of all genera that have ever been included in the synapsida excluding therapsida and purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomina dubia), or were not formally published (nomina nuda), as well as junior synonyms of more established names, and genera that are no longer considered pelycosaurs.

The list currently contains 83 generic names.

Naming conventions and terminology

Naming conventions and terminology follow the International Code of Zoological Nomenclature. Technical terms used include:

• Junior synonym: A name which describes the same taxon as a previously published name. If two or more genera are formally designated and the type specimens are later assigned to the same genus, the first to be published (in chronological order) is the senior synonym, and all other instances are junior synonyms. Senior synonyms are generally used, except by special decision of the ICZN, but junior synonyms cannot be used again, even if deprecated. Junior synonymy is often subjective, unless the genera described were both based on the same type specimen.
• Nomen nudum (Latin for "naked name"): A name that has appeared in print but has not yet been formally published by the standards of the ICZN. Nomina nuda (the plural form) are invalid, and are therefore not italicized as a proper generic name would be. If the name is later formally published, that name is no longer a nomen nudum and will be italicized on this list. Often, the formally published name will differ from any nomina nuda that describe the same specimen.
• Nomen oblitum (Latin for "forgotten name"): A name that has not been used in the scientific community for more than fifty years after its original proposal.
• Preoccupied name: A name that is formally published, but which has already been used for another taxon. This second use is invalid (as are all subsequent uses) and the name must be replaced. As preoccupied names are not valid generic names, they will also go unitalicized on this list.
• Nomen dubium (Latin for "dubious name"): A name describing a fossil with no unique diagnostic features. As this can be an extremely subjective and controversial designation, this term is not used on this list.

See also

• List of prehistoric mammals
• List of therapsids
• Synapsid

Notes and References

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3. 10.1080/02724634.2010.501441. Reisz, R.R. . Laurin, M. . Marjanovic, D. . amp. 2010. Apsisaurs witteri from the lower Permian of Texas: yet another small varanopid synapsid, not a diapsid. Journal of Vertebrate Paleontology. 30. 5. 1628–1631. 129835335 .
4. Laurin, M. . 1991 . The osteology of a Lower Permian eosuchian from Texas and a review of diapsid phylogeny . Zoological Journal of the Linnean Society . 101 . 1 . 59–95 . 10.1111/j.1096-3642.1991.tb00886.x .
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6. Reisz, R. R. . Dilkes, D. W. . amp. Archaeovenator hamiltonensis, a new varanopid from the upper carboniferous of Kansas . Canadian Journal of Earth Sciences . 40 . 4. 2003 . 667–678 . 10.1139/e02-063.
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8. Reisz, R. R. . Wilson, H. . Scott, D. . amp. Varanopseid synapsid skeletal elements from Richards Spur, a Lower Permian fissure fill near Fort Sill . Oklahoma Geology Notes . 57 . 1997 . 160–170 .
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14. Hook, R. W. . Hotton, N. . amp. A new sphenacodontid pelycosaur (Synapsida) from the Wichita Group, Lower Permian of north-central Texas . Journal of Vertebrate Paleontology . 11 . 1991 . 37–44 . 10.1080/02724634.1991.10011374 .
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25. Reisz, R.R. . Maddin, H.C. . Fröbisch, J. . Falconnet, J. . 2011 . A new large caseid (Synapsida, Caseasauria) from the Permian of Rodez (France), including a reappraisal of "Casea" rutena Sigogneau-Russell & Russell, 1974 . Geodiversitas . 33 . 2 . 227–246 . 10.5252/g2011n2a2 . 129458820 . https://web.archive.org/web/20120319204109/http://www.mnhn.fr/museum/front/medias/publication/36313_g2011n2a2.pdf . 2012-03-19 .
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31. Reisz, R. R. . Oromycter, a New Caseid from the Lower Permian of Oklahoma . Journal of Vertebrate Paleontology . 25 . 4 . 2005 . 905–910 . 10.1671/0272-4634(2005)025[0905:OANCFT]2.0.CO;2. 130056690 .
32. Credner, C.F.H. . 1888 . Die Stegocephalen und Saurier aus dem Rothliegenden des Plauen'schen Grundes bei Dresden. VII Theil: Palaeohatteria longicaudata Cred . Zeitschrift der Deutschen Geologischen Gesellschaft . 40 . 490–558 .
33. von Huene, F. . 1925 . Ein neuer Pelycosaurier aus der unteren Permformaiton Sachens . Geologische und Paläontologische Abhandlungen . 18 . 215–264 .
34. Sumida, S. S. . Reinterpretation of vertebral structure in the Early Permian pelycosaur Varanosaurus acutirostris (Amniota, Synapsida) . Journal of Vertebrate Paleontology . 9 . 4. 1989 . 451–458. 10.1080/02724634.1989.10011777 .
35. Anderson, J. S. . Reisz, R. R. . amp. Pyozia mesenensis, a new small varanopid (Synapsida, Eupelycosauria) from Russia: "Pelycosaur" diversity in the Middle Permian . Journal of Vertebrate Paleontology . 24 . 1 . 2004 . 173–179 . 10.1671/1940-13. 59023934 .
36. Reisz, R.R. . Maddin, H.C. . Fröbisch, J. . Falconnet, J. . 2011 . A new large caseid (Synapsida, Caseasauria) from the Permian of Rodez (France), including a reappraisal of "Casea" rutena Sigogneau-Russell & Russell, 1974 . Geodiversitas . 33 . 2 . 227–246 . 10.5252/g2011n2a2 . 129458820 . https://web.archive.org/web/20120319204109/http://www.mnhn.fr/museum/front/medias/publication/36313_g2011n2a2.pdf . 2012-03-19 .
37. Eberth, D. A. . Brinkman, D. . amp. Ruthiromia elcobriensis, a new pelycosaur from El Cobre Canyon, New Mexico . Breviora . 474 . 1983 . 1–27 .
38. Reisz, R. R. . Berman, D. S. . amp. Scoliomus puercensis Williston and Case, 1913, identified as a junior synonym of Sphenacodon ferox Marsh (Reptilia, Pelycosauria) . Canadian Journal of Earth Sciences . 22 . 8 . 1985 . 1236–1239 . 10.1139/e85-126. 1985CaJES..22.1236R .
39. Evans, D. C. . Maddin, H. C. . Reisz, R. R. . amp. A Re-evaluation of Sphenacodontid Synapsid Material from the Lower Permian Fissure Fills near Richards Spur, Oklahoma . Palaeontology . 52 . 1 . 2009 . 219–227 . 10.1111/j.1475-4983.2008.00837.x. free .
40. Reisz, R. R. . Laurin, M. . amp. A reevaluation of the enigmatic Permian synapsid Watongia and of its stratigraphic significance . Canadian Journal of Earth Sciences . 41 . 4. 2004 . 377–386 . 10.1139/e04-016. 2004CaJES..41..377R .