Belongs within: Therapsida.
Contains: Dicynodontia, Theriodontia.
The Eutherapsida are the clade of synapsids uniting modern mammals with the Permian Dinocephalia. Members of the clade are characterised by a bowing of the zygomatic arch and increase in size of the temporal fenestra, together with loss of the olecranon ulnae and reduction of the fifth pedal digit to three phalanges.
<==Eutherapsida [Anomodontia, Cryptodontia, Gorgonopsia]S03 |--+--DicynodontiaS03 | `--TheriodontiaS03 `--DinocephaliaS03 | i. s.: RhopalodonTT05 | Sinophoneus Cheng & Ji 1996CL97 | Microsyodon orloviCL97 | EstemmenosuchidaeB93 | |--Anoplosuchus tenuirostris Tchudinov 1968B93 | |--Zopherosuchus luceus Tchudinov 1983B93 | |--Molybdopygus arcanus Tchudinov 1964B93 | `--Estemmenosuchus Tchudinov 1960D07 | |--E. mirabilis Tchudinov 1968B93 | `--E. uralensis Tchudinov 1960B93 | TitanosuchidaeB93 | |--Titanosuchus Owen 1879D07 | | |--T. cloetiD07 | | `--T. ferox Owen 1879B93 | `--Jonkeria Van Hoepen 1916B93, D07 | |--J. boonstraiD07 | |--J. haughtoniD07 | |--J. ingensD07 | |--J. koupensisD07 | |--J. parvaD07 | |--J. rossowiD07 | |--J. truculenta Van Hoepen 1916B93 | `--J. vanderbyliD07 |--Stenocybus Cheng & Li 1997 [Stenocybusidae]CL97 | `--*S. acidentatus Cheng & Li 1997CL97 `--+--Tapinocephalidae [Tapinocephalia, Tretospondylia]CL97 | |--TapinocephalusC07 | |--Tapinocaninus pamelae Rubidge 1988B93 | |--Struthiocephalus whaitsi Haughton 1915B93 | `--Ulemosaurus Rjabinin 1938TT05, D07 | |--U. gigasTT05 | `--U. svigagensis Riabinin 1938B93 `--Anteosauridae [Anteosauria]CL97 |--Syodon biarmicum Kutorga 1838B93 |--AustralosyodonCL97 |--Eosyodon hudsoni Olson 1962B93 |--Notosyodon biarmicum Kutorga 1838B93 |--Doliosauriscus yanshinovi (Orlov 1958)B93 |--Admetophoneus kargalensis Efremov 1954B93 |--Paranteosaurus primus Boonstra 1954B93 |--Anteosaurus Watson 1921D07 | `--A. magnificus Watson 1921B93 |--TitanophoneusCL97 | |--T. adamanteus (Orlov 1958)TT05 | `--T. potens Efremov 1938B93 `--DeuterosaurusB93 |--D. biarmicus Eichwald 1860B93 `--D. jubilaei (von Nopcsa 1928)TT05 Eutherapsida incertae sedis: Theriognathus Broom 1920C07, D07 `--T. micropsD07 Endothiodontidae [Endothiodontia]B93 |--EndothiodonC07 `--Chelydontops altidentalis Cluver 1975B93 DromasauriaR61 | i. s.: GalechirusR61 |--Galeops [Galeopidae]R61 | `--G. whaitsi Broom 1912B93 `--DromasauridaeB93 |--Patronomodon nyaphulii Rubidge & Hopson 1991B93 `--Galepus jouberti Broom 1910R61, B93 Watongia [Watongiidae]B93 `--W. meieri Olson 1974B93 Eodicynodon [Eodicynodontidae]B93 `--E. oosthuizeni Barry 1974B93 CryptodontidaeB93 |--Tropidostoma microtrema (Seeley 1889)B93 |--Cteniosaurus platyceps Broom 1935B93 |--Rhachiocephalus magnus (Owen 1876)B93 `--Oudenodon baini Owen 1860B93
*Type species of generic name indicated
References
[B93] Benton, M. J. 1993. Reptilia. In: Benton, M. J. (ed.) The Fossil Record 2 pp. 681–715. Chapman & Hall: London.
[C07] Case, E. C. 1907. Revision of the Pelycosauria of North America. Carnegie Institute of Washington Publication 55: 1–176, 35 pls.
[CL97] Cheng Z. & Li J. 1997. A new genus of primitive dinocephalian—the third report on Late Permian Dashankou lower tetrapod fauna. Vertebrata PalAsiatica 35 (1): 35–43.
[D07] Dixon, D. 2007. The Complete Illustrated Encyclopedia of Dinosaurs & Prehistoric Creatures. Hermes House: London.
[R61] Romer, A. S. 1961. Synapsid evolution and dentition. In: Vandebroek, G. (ed.) International Colloquium on the Evolution of Lower and Non Specialized Mammals. Koninklijke Vlaames Academie voor Wetenschappen, Letteren en Schone Kunsten van Belgie—Klasse der Wetenschapen 1961 (1): 9–56.
[S03] Sidor, C. A. 2003. The naris and palate of Lycaenodon longiceps (Therapsida: Biarmosuchia), with comments on their early evolution in the Therapsida. Journal of Paleontology 77 (5): 977–984.
[TT05] Tverdokhlebov, V. P., G. I. Tverdokhlebova, A. V. Minikh, M. V. Surkov & M. J. Benton. 2005. Upper Permian vertebrates and their sedimentological context in the South Urals, Russia. Earth-Science Reviews 69: 27–77.