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Regisaurus Temporal range: Early Triassic PreꞒ Ꞓ O S D C P T J K Pg N ↓

Skull cast seen from below, Museum of Evolution of Polish Academy of Sciences, Warsaw
Scientific classification
Kingdom:	Animalia
Phylum:	Chordata
Class:	Synapsida
Order:	Therapsida
Suborder:	Therocephalia
Family:	Regisauridae
Genus:	Regisaurus
Species
R. jacobi Mendrez, 1972

Regisaurus ("Rex's lizard", named after Francis Rex Parrington) is an extinct genus of small carnivorous therocephalian. It is known from a single described species, the type species Regisaurus jacobi, from the Early Triassic Lystrosaurus Assemblage Zone of South Africa, although at least one undescribed species is also known.^[1]

Description

It was a rather derived baurioid, with a robust skull, short tail, long limbs and relatively large canines. It was apparently related to Urumchia and like Urumchia, it had vomer bones, which form the secondary palate, but they do not narrow to a tip like in Urumchia. However, it retained some primitive characteristics. It had six incisor teeth in each side of the jaw, whereas other baurioids had less.^[2] It was probably carnivorous, and ate insects and small vertebrates

Discovery and species

Regisaurus was discovered in 1964 by James W. Kitching and it was named in 1972 by C. H. Mendrez. Two species are known, the type species Regisaurus jacobi and an additional undescribed species. R. jacobi is known from the holotype FRP 1964/27 and the referred specimen BP/1/3973,^[3] while the undescribed species is known only from the Holotype T837.^[4]^[5]

Classification

Below is a cladogram modified from Sidor (2001) and Huttenlocker (2009):^[6]^[7]

Baurioidea

Ictidosuchops rubidgei

Ictidosuchidae

	Ictidosuchus primaevus

	Ictidosuchoides longiceps

Regisauridae

	Regisaurus jacobi

	Urumchia lii

Karenitidae

	NHCC LB44 (Unnamed Zambian karenitid)

	Karenites ornamentatus

Lycideopidae

Lycideops longiceps

Choerosaurus dejageri

	Tetracynodon tenuis

	Tetracynodon darti

Scaloposaurus constrictus

Ericiolacertidae

	Ericiolacerta parva

	Silphedosuchus orenburgensis

Nothogomphodon danilovi

"Ordosiidae"

	Hazhenia concava

	Ordosiodon youngi

Bauriidae

Bauria cynops

	Antecosuchus ochevi

	Microgomphodon oligocynus

	Traversodontoides wangwuensis

References

^ C. H. Mendrez (1972). "On the skull of Regisaurus jacobi, a new genus and species of Bauriamorpha Watson and Romer 1956 (=Scaloposauria Boonstra 1953), from the Lystrosaurus-zone of South Africa". In K. A. Joysey; T. S. Kemp (eds.). Studies in Vertebrate Evolution. Edinburgh: Oliver & Boyd. pp. 191–212. ISBN 9780050021316.
^ http://wiredspace.wits.ac.za/bitstream/handle/10539/16101/2007.v.42.Fourie_%26_Rubidge_Postcranial_anatomy_therocephalian.pdf?sequence=1 ^{[bare URL PDF]}
^ "Untitled Document".
^ Kemp, T. S. (1986). "The skeleton of a baurioid therocephalian therapsid from the Lower Triassic (Lystrosaurus Zone) of South Africa" (PDF). Journal of Vertebrate Paleontology. 6 (3): 215–232. doi:10.1080/02724634.1986.10011617. JSTOR 4523096. Archived from the original (PDF) on 4 October 2012. Retrieved 26 March 2011.
^ "Untitled Document".
^ Sidor, C.A. (2001). "Simplification as a trend in synapsid cranial evolution" (PDF). Evolution. 55 (7): 1419–1442. doi:10.1554/0014-3820(2001)055[1419:saatis]2.0.co;2. PMID 11525465.
^ Huttenlocker, A. (2009). "An investigation into the cladistic relationships and monophyly of therocephalian therapsids (Amniota: Synapsida)". Zoological Journal of the Linnean Society. 157 (4): 865–891. doi:10.1111/j.1096-3642.2009.00538.x.

Therocephalia

Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Clade: Therapsida
Clade: Eutheriodontia

Synapsida

see Synapsida
Therocephalia	see below↓

Therocephalia

Gorynychus Porosteognathus Cynodontia?
Lycosuchidae	Lycosuchus Simorhinella
Scylacosauridae	Alopecodon Alopecognathus Biarmosuchoides? Eutheriodon Glanosuchus Hyorhynchus Julognathus Koksharovia Maraisaurus Pardosuchus Pristerognathus Scylacosaurus

Eutherocephalia

Chthonosauridae

Chthonosaurus
Ichibengops

Akidnognathidae

Whaitsioidea

Ophidostoma
Hofmeyriidae	Gorochovetzia Hofmeyria Ictidostoma Mirotenthes
Whaitsiidae	Dalongkoua Ictidochampsa Megawhaitsia Microwhaitsia Moschowhaitsia Theriognathus Viatkosuchus

Baurioidea

- see below↓

Baurioidea

Karenitidae

Karenites
Mupashi

Lycideopidae

Regisauridae

Regisaurus
Urumchia

Bauriamorpha

Hazhenia Nothogomphodon Notictoides Ordosiodon Scaloposaurus
Ericiolacertidae	Ericiolacerta Pedaeosaurus? Silphedosuchus
Bauriidae	Antecosuchus Bauria Microgomphodon Scalopognathus Traversodontoides

Nomina dubia
Alopecorhinus Arnognathus Blattoidealestes Dongusaurus Hyaenasuchus Ictidoparia Ictidosaurus Scymnosaurus Tamboeria Trochorhinus Trochosaurus Trochosuchus

Category

Geology of South Africa

Geological formations

List of fossiliferous stratigraphic units in South Africa

Palaeoarchaean	Bushveld Igneous Complex Fig Tree Formation Komatii Formation Moodies Group Onverwacht Group Transvaal Supergroup
Paleozoic	Carboniferous Dwyka Group Ganigobis Formation Devonian Bokkeveld Group Table Mountain Sandstone Permian Abrahamskraal Formation Balfour Formation Dwyka Group Ganigobis Formation Teekloof Formation Whitehill Formation Ordovician Soom Shale
Mesozoic	Cretaceous Uitenhage Group Buffelskloof Formation Enon Formation Kirkwood Formation Sundays River Formation Kalahari Deposits Jurassic Drakensberg Group Enon Formation Uitenhage Group Karoo Supergroup Beaufort Group Abrahamskraal Formation Balfour Formation Katberg Formation Middleton Formation Teekloof Formation Dwyka Group Ecca Group Whitehill Formation Stormberg Group Bushveld Sandstone Clarens Formation Elliot Formation Triassic Elliot Formation Katberg Formation Molteno Formation Normandien Formation
Cenozoic	Algoa Group

‎Tectonics and orogeny

Volcanism	List of volcanoes in South Africa Pilanesberg Pilanesberg Game Reserve Prince Edward Islands Diatremes Big Hole Finsch diamond mine Jagersfontein Mine Koffiefontein mine Barberton Greenstone Belt Drakensberg Karoo-Ferrar
Earthquakes	1620 Robben Island earthquake 1969 Tulbagh earthquake 2006 Mozambique earthquake 2014 Orkney earthquake
Impact craters	Kalkkop crater Morokweng impact structure Tswaing crater Vredefort impact structure
Meteorites	Bellsbank meteorite

‎Mineral deposits
Kimberlite Merensky Reef Witwatersrand Banket (mining term) Coal in South Africa Iron ore in Africa Platinum in Africa Titanium in Africa Uranium in Africa Minerals Council South Africa Department of Mineral Resources (South Africa) Department of Mineral Resources and Energy

Paleontology‎

Ordovician

Devonian

Carboniferous

Permian

Beaufort Group

Assemblages	Cistecephalus Assemblage Zone Daptocephalus Assemblage Zone Eodicynodon Assemblage Zone Pristerognathus Assemblage Zone Tapinocephalus Assemblage Zone Tropidostoma Assemblage Zone

Triassic

Assemblages	Cynognathus Assemblage Zone Lystrosaurus Assemblage Zone

Jurassic

Cretaceous

Paleogene

Nummulite

Neogene

Pleistocene

Other

Research and administration‎

Geologists	Hans Merensky
Paleontologists	Andrew Geddes Bain Lieuwe Dirk Boonstra Charles Kimberlin Brain Robert Broom Alfred Brown Anusuya Chinsamy-Turan H. Basil S. Cooke Alfred W. Crompton Daniel Rossouw Kannemeyer Andre Keyser James Kitching John Talbot Robinson George William Stow Eduard Meine van Zinderen-Bakker

Regional articles
Geology of Cape Town

Other
Pothole (geology) Steep structure Swazian

Categories:

Hidden categories:

Description

Discovery and species

Classification

See also

References