User:Paleocemoski/List of synapsids

This list of synapsids is a listing of all species that have ever been included in the class Synapsida, excluding class Mammalia.

• Valid species
• Junior synonym
• Vague status
• Rejected as valid taxon

Number of species

Synapsid groups			Image	Valid species	Junior synonym	Vague status	Rejected as valid taxon	Group totals
Caseasauria	Caseidae			17	1	3	0	21
	Eothyrididae			2	0	0	0	2
Eupelycosauria	Edaphosauridae			10	15	2	0	27
	Sphenacodontia	Sphenacodontidae		20	17	8	0	45
		Therapsida		?	?	?	?	?
		Other Sphenacodontians		5	8	0	0	13
Unnamed taxon	Ophiacodontidae			13	21	3	1	38
	Varanopidae			14	2	2	2	20
Other synapsids				0	0	6	0	6
Overall				81	64	24	3	172

Caseidae

• The list currently includes 21 species
• 17 are considered valid species
• 1 are considered junior synonym
• 3 are considered either nomina dubia or incertae sedis

Species	Authority	Synonyms	Status	Notes	Location	Age	Images
Alierasaurus ronchii	Romano and Nicosia, 2014				Italy, Sardinia Cala del Vino Formation	Kungurian or Roadian
Angelosaurus dolani	Olson & Beerbower, 1953				USA, Texas San Angelo Formation	Kungurian
Angelosaurus greeni	Olson, 1962				USA, Texas Flowerpot Formation	Kungurian
Angelosaurus romeri	Olson & Barghusen 1962				USA, Oklahoma Chickasha Formation	Roadian
Casea broilii	Williston, 1910				USA, Texas Arroyo Formation	Kungurian
Casea halselli	Olson, 1954				USA, Texas Choza Formation	Kungurian
Casea nicholsi	Olson, 1954				USA, Texas Vale Formation	Kungurian
Casea rutena	Sigogneau-Russel & Russell, 1974			Synonym of Euromycter rutenus	France, Aveyron Colline du Cayla	Sakmarian
Caseoides sanangelensis	Olson and Beerbower 1953				USA, Texas San Angelo Formation	Kungurian
Caseopsis agilis	Olson, 1962				USA, Texas San Angelo Formation	Kungurian
Cotylorhynchus bransoni	Olson & Barghusen, 1962				USA, Oklahoma Flowerpot Formation	Kungurian
Cotylorhynchus hancocki	Olson & Beerbower, 1953				USA, Texas San Angelo Formation	Kungurian
Cotylorhynchus romeri	Stovall, 1937a				USA, Oklahoma Hennessey Formation	Kungurian
Ennatosaurus tecton	Efremov, 1956				Russia, Arkhangelsk	Wordian
Eocasea martini	Reisz & Fröbisch, 2014				USA, Kansas Hamilton Quarry	Gzhelian
Euromycter rutenus	Sigogneau-Russell & Russell, 1974	Casea rutena			France, Aveyron Colline du Cayla	Sakmarian
Knoxosaurus niteckii	Olson, 1962				USA, Texas San Angelo Formation	Kungurian
Oromycter dolesorum	Reisz, 2005				USA, Oklahoma Garber Formation	Kungurian
Phreatophasma aenigmaticum	Efremov, 1954				Russia, Bashkortostan	Roadian
Ruthenosaurus russellorum	Reisz, 2011				France, Aveyron Colline du Cayla	Sakmarian
Trichasaurus texenensis	Williston, 1913	Trispondylus texenensis			USA, Texas Arroyo Formation	Kungurian

Edaphosauridae

• The list currently includes 27 species
• 10 are considered valid species
• 15 are considered junior synonym
• 2 are considered either nomina dubia or incertae sedis

Species	Authority	Synonyms	Status	Notes	Location	Age	Images
Brachycnemius dolischomerus	Williston, 1911			Synonym of Edaphosaurus pogonias	USA, Texas Arroyo Formation	Kungurian
Edaphosaurus boanerges	Romer & Price, 1940				USA, Texas Archer City Formation Nocona Formation	Artinskian
Edaphosaurus claviger	Cope, 1886			Synonym of Edaphosaurus pogonias	USA, Texas Arroyo Formation	Kungurian
Edaphosaurus colohistion	Berman, 1979				USA, West Virginia Pittsburgh Formation	Gzhelian
Edaphosaurus credneri	Romer & Price, 1940			Synonym of Ianthasaurus credneri	Germany, Sachsen State Niederhäslich Formation	Sakmarian
Edaphosaurus cruciger	Romer & Price, 1940	Dimetrodon cruciger Edaphosaurus microdus Naosaurus cruciger Naosaurus microdus			USA, Texas Belle Plains Formation Lueders Formation USA, Oklahoma Garber Formation	Kungurian
Edaphosaurus ecordi	Peabody, 1957			Synonym of Xyrospondylus ecordi	USA, Kansas Stanton Formation	Kasimovian
Edaphosaurus microdus	Cope, 1884			Synonym of Edaphosaurus cruciger	USA, Texas	Kungurian
Edaphosaurus mirabilis	Romer & Price, 1940			Synonym of Ianthasaurus mirabilis	Czech Republic, Kuonova	Gzhelian
Edaphosaurus novomexicanus	Williston and Case, 1913				USA ,New Mexico Abo/Cutler Formation	Gzhelian to Asselian
Edaphosaurus pogonias	Cope, 1882	Brachycnemius dolischomerus Edaphosaurus claviger Naosaurus claviger Naosaurus pogonias			USA, Texas Arroyo Formation	Kungurian
Edaphosaurus raymondi	Romer & Price, 1940	Ianthasaurus raymondi Naosaurus raymondi			USA, Pennsylvania Round Knob Formation	Kasimovian or Gzhelian
Glaucosaurus megalops	Williston, 1915				USA, Texas Waggoner Ranch Formation	Kungurian
Ianthasaurus credneri	Romer & Price, 1940	Edaphosaurus credneri Naosaurus credneri			Germany, Sachsen State Niederhäslich Formation	Sakmarian
Ianthasaurus hardestii	Reisz & Berman, 1986				USA, Kansas Stanton Formation	Kasimovian
Ianthasaurus mirabilis	Romer & Price, 1940	Edaphosaurus mirabilis Naosaurus mirabilis			Czech Republic, Kuonova	Gzhelian
Ianthasaurus raymondi	Case, 1908			Synonym of Edaphosaurus raymondi	USA, Pennsylvania Round Knob Formation	Kasimovian or Gzhelian
Lupeosaurus gigas	Romer, 1936			Synonym of Lupeosaurus kayi	USA, Texas Moran Formation	Artinskian
Lupeosaurus kayi	Romer, 1937	Dimetrodon gigas Luperosaurus gigas			USA, Texas Moran Formation	Artinskian
Naosaurus claviger	Cope, 1886			Synonym of Edaphosaurus pogonias	USA, Texas Arroyo Formation	Kungurian
Naosaurus credneri	Jaekel, 1910			Synonym of Ianthasaurus credneri	Germany, Sachsen State Niederhäslich Formation	Sakmarian
Naosaurus cruciger	Cope, 1880			Synonym of Edaphosaurus cruciger	USA, Texas	Kungurian
Naosaurus microdus	Cope, 1881			Synonym of Edaphosaurus cruciger	USA, Texas	Kungurian
Naosaurus mirabilis	Fritsch, 1895			Synonym of Ianthasaurus mirabilis	Czech Republic, Kuonova	Gzhelian
Naosaurus pogonias	Cope, 1882			Synonym of Edaphosaurus pogonias	USA, Texas Arroyo Formation	Kungurian
Naosaurus raymondi	Case, 1908			Synonym of Edaphosaurus raymondi	USA, Pennsylvania Round Knob Formation	Kasimovian or Gzhelian
Xyrospondylus ecordi	Reisz, Heaton & Pynn, 1982	Edaphosaurus ecordi			USA, Kansas Stanton Formation	Kasimovian

Eothyrididae

• The list currently includes 2 species
• 2 are considered valid species

Species	Authority	Synonyms	Status	Notes	Location	Age	Images
Eothyris parkeyi	Romer, 1937				USA, Texas ‭‬Belle Plains Formation	Artinskian
Oedaleops campi	Langston, 1965				USA, New Mexico Abo/Cutler Formation	Sakmarian

Ophiacodontidae

• The list currently includes 38 species
• 13 are considered valid species
• 21 are considered junior synonym
• 3 are considered either nomina dubia or incertae sedis
• 1 are considered invalid species

Species	Authority	Synonyms	Status	Notes	Location	Age	Images
Archaeobelus vellicatus	Cope 1877			Synonym of Clepsydrops vinslovii	USA, Illinois Bond Formation	Kasimovian
Archaeothyris florensis	Reisz, 1972				Canada, Nova Scotia Morien Group	Kasimovian
Arribasaurus navajovicus	Williston, 1914	Dimetrodon navajovicus		Synonym of Ophiacodon navajovicus	USA, New Mexico Abo/Cutler Formation	Asselian
Baldwinonus dunkardensis	Romer, 1952				USA, Ohio Washington Formation	Asselian
Baldwinonus trux	Romer & Price, 1940				USA, New Mexico Abo/Cutler Formation	Asselian
Clepsydrops collettii	Cope, 1875	Archaeobelus vellicatus Clepsydrops pedunculatus			USA, Illinois Bond Formation	Kasimovian
Clepsydrops gigas	Cope, 1878			Synonym of Dimetrodon gigas
Clepsydrops leptocephalus	Cope, 1884			Synonym of Ophiacodon retroversus	USA, Texas Nocona Formation	Kungurian
Clepsydrops limbatus	Cope, 1877			Synonym of Dimetrodon limbatus
Clepsydrops macrospondylus	Cope 1884			Synonym of Dimetrodon macrospondylus
Clepsydrops magnus	Romer 1961			Possible synonym of Ophiacodon	USA, Pennsylvania	Kasimovian or Gzhelian
Clepsydrops natalis	Cope, 1878			Synonym of Dimetrodon natalis
Clepsydrops pedunculatus	Cope 1877			Synonym of Clepsydrops collettii	USA, Illinois Bond Formation	Kasimovian
Clepsydrops vinslovii	Cope, 1877	Captorhinus illinoisensis (?)		Possible synonym of Clepsydrops collettii	USA, Illinois Bond Formation	Kasimovian
Diopeus leptocephalus	Cope, 1884	Clepsydrops leptocephalus		Synonym of Ophiacodon retroversus	USA, Texas Nocona Formation	Kungurian
Ophiacodon beckiae	Wilson, 1989			Nomen vanum	USA, Kansas	Late Carboniferous
Ophiacodon hilli	Romer and Price 1940	Winfeldia hilli			USA, Kansas Barneston Limestone Formation	Sakmarian
Ophiacodon major	Romer and Price 1940				USA, Texas Waggoner Ranch Formation	Kungurian
Ophiacodon mirus	Marsh, 1878				USA, New Mexico Abo/Cutler Formation	Asselian
Ophiacodon navajovicus	Romer & Price, 1940	Arribasaurus navajovicus Dimetrodon navajovicus			USA, New Mexico Abo/Cutler Formation	Asselian
Ophiacodon retroversus	Romer & Price, 1940	Clepsydrops leptocephalus Diopeus leptocephalus Ophiacodon triangulata Ophiacodon watsoni Theropleura retroversus Theropleura trianagulata Therosaurus watsoni			USA, Texas Nocona Formation	Kungurian
Ophiacodon triangulata	(?)			Synonym of Ophiacodon retroversus	USA, Texas Nocona Formation	Kungurian
Ophiacodon uniformis	Romer & Price, 1940	Poliosaurus uniformis Theropleura uniformis			USA, Texas Putnam Formation	Sakmarian
Ophiacodon watsoni	(?)			Synonym of Ophiacodon retroversus	USA, Texas Nocona Formation	Kungurian
Poecilospondylus francisi	Case 1910			Synonym of Varanosaurus acutirostris	USA, Texas Arroyo Formation	Kungurian
Poliosaurus uniformis	Case, 1907	Theropleura uniformis		Synonym of Ophiacodon uniformis	USA, Texas Putnam Formation	Sakmarian
Stereophallodon ciscoensis	Romer, 1937				USA, Texas Pueblo Formation	Asselian
Stereorhachis dominans	Gaudry, 1880				France, Saone-et Loire	Gzhelian
Theropleura grandis	Case, 1907			Synonym of Dimetrodon grandis	USA, Texas Arroyo Formation	Kungurian
Theropleura obtusidens	Cope, 1880			Synonym of Secodontosaurus obtusidens	USA, Texas Nocona Formation	Artinskian
Theropleura retroversus	Cope, 1878			Synonym of Ophiacodon retroversus	USA, Texas Nocona Formation	Kungurian
Theropleura trianagulata	Cope, 1878			Synonym of Ophiacodon retroversus	USA, Texas Nocona Formation	Kungurian
Theropleura uniformis	Cope, 1878			Synonym of Ophiacodon uniformis	USA, Texas Putnam Formation	Sakmarian
Therosaurus watsoni	Huene, 1925			Synonym of Ophiacodon retroversus	USA, Texas Nocona Formation	Kungurian
Varanosaurus acutirostris	Broili 1904	Poecilospondylus francisi			USA, Texas Arroyo Formation	Kungurian
Varanosaurus brevirostris	Williston, 1911			Synonym of Varanops brevirostris	USA, Texas Arroyo Formation	Kungurian
Varanosaurus wichitaensis	Romer 1937				USA, Texas Belle Plains Formation	Kungurian
Winfeldia hilli	Romer, 1925			Synonym of Ophiacodon hilli	USA, Kansas Barneston Limestone Formation	Sakmarian

Sphenacodontia

Sphenacodontidae

• The list currently includes 45 species
• 20 are considered valid species
• 17 are considered junior synonym
• 8 are considered either nomina dubia or incertae sedis

Species	Authority	Synonyms	Status	Notes	Location	Age	Images
Bathyglyptus theodori	Case, 1911			Synonym of Dimetrodon grandis	USA, Texas Arroyo Formation	Kungurian
Bathygnathus borealis	Leidy, 1854			Poorly known	Canada, Prince Edward Island Orby Head Formation	Artinskian
Cryptovenator hirschbergeri	Fröbisch, Schoch, Müller, Schindler & Schweiss, 2011				Germany, Rineland Palatinate Remigiusberg Formation	Gzhelian
Ctenorhachis jacksoni	Hook & Hotton, 1991				USA, Texas Nocona Formation Belle Plains Formation	Artinskian to Kungurian
Ctenospondylus casei	Romer, 1936				USA, Texas Belle Plains Formation USA, Utah Cutler Formation	Sakmarian to Kungurian
Ctenospondylus ninevehensis	Berman, 1978				USA,‭ ‬Ohio Greene Formation	Sakmarian
Cutleria wilmarthi	Lewis & Vaughn, 1965			Incertae sedis (basalmost sphenacodontid or derived stem-sphenacodontoid)	USA, Colorado Cutler Formation	Asselian to Sakmarian
Dimetrodon angelensis	Olson, 1962	Eosyodon hudsoni			USA, Texas San Angelo Formation	Kungurian
Dimetrodon booneorum	Romer, 1937				USA, Texas Nocona Formation Petrolia Formation	Artinskian to Kungurian
Dimetrodon cruciger	Cope, 1878			Synonym of Edaphosaurus cruciger	USA, Texas	Kungurian
Dimetrodon dollovianus	Case, 1907	Embolophorus dollovianus			USA, Oklahoma Waggoner Ranch Formation USA, Texas Petrolia Formation Arroyo Formation	Artinskian to Kungurian
Dimetrodon fritillus	Cope, 1878			Synonym of Embolophorus fritillus	USA, Texas	Early Permian
Dimetrodon giganhomogenes	Case, 1907				USA, Texas Arroyo Formation Choza Formation Vale Formation USA, Oklahoma Willington Formation	Kungurian
Dimetrodon gigas	Cope, 1878	Clepsydrops gigas		Synonym of Dimetrodon grandis	USA, Texas Arroyo Formation	Kungurian
Dimetrodon grandis	Romer and Price, 1940	Bathyglyptus theodori Clepsydrops gigas Dimetrodon gigas Dimetrodon maximus Theropleura grandis			USA, Texas Arroyo Formation Vale Formation USA, Oklahoma Waggoner Ranch Formation Wellington Formation	Kungurian
Dimetrodon incisivus	Cope, 1878			Synonym of Dimetrodon limbatus	USA, Texas Nocona Formation Petrolia Formation	Artinskian to Kungurian
Dimetrodon kempae	Romer, 1937			Possible nomen dubium	USA, Texas Arroyo Formation	Kungurian
Dimetrodon limbatus	Romer and Price, 1940	Clepsydrops limbatus Dimetrodon incisivus Dimetrodon rectiformis Dimetrodon semiradicatus			USA, Texas Nocona Formation Petrolia Formation USA, Oklahoma Garber Sandstone Wellington Formation USA, New Mexico Abo Formation	Artinskian to Kungurian
Dimetrodon longiramus	Case, 1907			Synonym of Secodontosaurus obtusidens	USA, Texas Nocona Formation	Artinskian
Dimetrodon loomisi	Romer, 1937				USA, Texas Arroyo Formation	Kungurian
Dimetrodon macrospondylus	Case, 1907	Clepsydrops macrospondylus Dimetrodon platycentrus			USA, Texas Petrolia Formation USA, Oklahoma Waggoner Ranch Formation	Kungurian
Dimetrodon maximus	Romer, 1936			Synonym of Dimetrodon grandis	USA, Texas	Kungurian
Dimetrodon milleri	Romer, 1937				USA, Texas Archer City Formation USA, New Mexico Bursum Formation	Gzhelian to Artinskian
Dimetrodon natalis	Romer, 1936	Clepsydrops natalis			USA, Texas Archer City Formation Nocona Formation Petrolia Formation	Artinskian to Kungurian
Dimetrodon obtusidens	Case, 1907	Theropleura obtusidens		Synonym of Secodontosaurus obtusidens	USA, Texas Nocona Formation	Artinskian
Dimetrodon occidentalis	Berman, 1977				USA, New Mexico Abo Formation El Cobre Canyon Formation	Asselian to Sakmarian
Dimetrodon platycentrus	Case, 1907			Synonym of Dimetrodon macrospondylus	USA, Oklahoma Waggoner Ranch Formation	Kungurian
Dimetrodon rectiformis	Cope, 1878			Synonym of Dimetrodon limbatus	USA, Texas Nocona Formation	Artinskian
Dimetrodon semiradicatus	Cope, 1881			Synonym of Dimetrodon limbatus	USA, Texas Nocona Formation	Artinskian
Dimetrodon teutonis	Berman, 2001				Germany, Thuringia Tambach Formation	Artinskian
Elcabrosaurus baldwini	Case, 1907			Synonym of Sphenacodon ferox	USA, New Mexico El Cobre Canyon Formation	Asselian
Embolophorus dollovianus	Cope, 1888			Synonym of Dimetrodon dollovianus	USA, Oklahoma Waggoner Ranch Formation	Kungurian
Embolophorus fritillus	Cope, 1878				USA, Texas	Early Permian
Eosyodon hudsoni	Olson, 1962			Synonym of Dimetrodon angelensis	USA, Texas San Angelo Formation	Kungurian
Macromerion schwartzenbergii	Fritsch, 1879			Poorly known	Czech Republic, Kounová	Gzhelian
Neosaurus cynodus	Nopsca, 1923	Geosaurus cynodus (?) Stereorachis cynodus (?)		Poorly known	France, Jura Walchia Beds	Asselian
Oxyodon britannicus	Huene, 1908			Synonym of Sphenacodon britannicus	UK, England Kenilworth Sandstone Formation	Asselian
Scoliomus puercensis	Williston and Case, 1913			Synonym of Sphenacodon ferox	USA, New Mexico Abo/Cutler Formation	Asselian
Secodontosaurus longiramus	Case 1907	Dimetrodon longiramus		Synonym of Secodontosaurus obtusidens	USA, Texas Nocona Formation	Artinskian
Secodontosaurus obtusidens	Romer, 1936	Dimetrodon longiramus Dimetrodon obtusidens Secodontosaurus longiramus Theropleura obtusidens			USA, Texas Nocona Formation Belle Plains Formation	Artinskian to Kungurian
Secodontosaurus willistoni	Romer, 1936				USA, Texas Arroyo Formation	Kungurian
Sphenacodon britannicus	Paton, 1974	Oxyodon britannicus		Incertae sedis	UK, England Kenilworth Sandstone Formation	Asselian
Sphenacodon ferocior	Romer, 1937				USA, New Mexico Abo/Cutler Formation El Cobre Canyon Formation USA, Utah Cutler Formation	Asselian to Sakmarian
Sphenacodon ferox	Marsh, 1878	Elcabrosaurus baldwini Scoliomus puercensis			USA, New Mexico Abo/Cutler Formation El Cobre Canyon Formation	Asselian to Sakmarian
Steppesaurus gurleyi	Olson & Beerbower, 1953			Poorly known	USA, Texas San Angelo Formation	Kungurian

Therapsida

Main page: User:Paleocemoski/List of therapsids

• The list currently includes ? species
• ? are considered valid species
• ? are considered junior synonym
• ? are considered either nomina dubia or incertae sedis
• ? are considered invalid species

Other sphenacodontians

• The list currently includes 13 species
• 5 are considered valid species
• 8 are considered junior synonym

Species	Authority	Synonyms	Status	Notes	Location	Age	Images
Callibrachion gaudryi	Boule & Glangeau, 1893			Synonym of Haptodus baylei	France, Saone-et Loire Millery Formation	Asselian
Datheosaurus macrourus	Schroeder, 1905			Synonym of Haptodus baylei	Poland, Silesia Ludwikowice Formation	Gzhelian
Datheosaurus saxonicus	Huene, 1925			Synonym of Pantelosaurus saxonicus	Germany, Saxony Döhlen Formation	Asselian
Haptodus baylei	Gaudry, 1886	Callibrachion gaudryi Datheosaurus macrourus Haptodus gaudryi Haptodus macrourus			Poland, Silesia Ludwikowice Formation France, Saone-et Loire Millery Formation	Gzhelian to Asselian
Haptodus garnettensis	Currie, 1977				USA, Kansas Stanton Formation	Kasimovian
Haptodus gaudryi	Romer & Price, 1940	Callibrachion gaudryi		Synonym of Haptodus baylei	France, Saone-et Loire Millery Formation	Asselian
Haptodus grandis	Paton, 1974				UK, England Kenilworth Sandstone Formation	Asselian
Haptodus longicaudata	Romer & Price, 1940			Synonym of Palaeohatteria longicaudata	Germany, Saxony Niederhäslich-Schweinsdorf Formation	Sakmarian
Haptodus macrourus	Romer & Price, 1940	Datheosaurus macrourus		Synonym of Haptodus baylei	Poland, Silesia Ludwikowice Formation	Gzhelian
Haptodus saxonicus	Romer & Price, 1940			Synonym of Pantelosaurus saxonicus	Germany, Saxony Döhlen Formation	Asselian
Palaeohatteria longicaudata	Credner, 1888	Haptodus longicaudata Palaeosphenodon longicaudata			Germany, Saxony Niederhäslich-Schweinsdorf Formation	Sakmarian
Palaeosphenodon longicaudata	Baur, 1889			Synonym of Palaeohatteria longicaudata	Germany, Saxony Niederhäslich-Schweinsdorf Formation	Sakmarian
Pantelosaurus saxonicus	Huene, 1925	Datheosaurus saxonicus Haptodus saxonicus			Germany, Saxony Döhlen Formation	Asselian

Varanopidae

• The list currently includes 20 species
• 14 are considered valid species
• 2 are considered junior synonym
• 2 are considered either nomina dubia or incertae sedis
• 2 are considered invalid species

Mycterosaurinae

• The list currently includes 9 species
• 4 are considered valid species
• 2 are considered junior synonym
• 1 are considered either nomina dubia or incertae sedis
• 2 are considered invalid species

Species	Authority	Synonyms	Status	Notes	Location	Age	Images
Basicranodon fortsillensis	Vaughn, 1958			Synonym of Mycterosaurus longiceps	USA, Oklahoma Garber Formation	Artinskian
Elliotsmithia longiceps	Broom, 1937				South Africa, Western Cape Tapinocephalus Assemblage Zone	Capitanian
Eumatthevia bolli	Broom, 1930			Synonym of Mycterosaurus longiceps	USA, Texas Waggoner Ranch Formation	Artinskian
Heleosaurus scholtzi	Broom, 1907	Heliosaurus			South Africa, Northern Cape Tapinocephalus Assemblage Zone	Capitanian
Heliosaurus sp.	Huene, 1956			Sic (Heleosaurus)	South Africa, Northern Cape Tapinocephalus Assemblage Zone	Capitanian
Mesenosaurus romeri	Efremov, 1938	Mesonosaurus			Russia, Arkhangelsk Krasnoshchel' Formation	Wordian to Capitanian
Mesonosaurus sp.	Ivakhenko & Kurzanov, 1979			Sic (Mesenosaurus)	Russia, Arkhangelsk Krasnoshchel' Formation	Wordian to Capitanian
Mycterosaurus longiceps	Williston, 1915	Basicranodon fortsillensis Eumatthevia bolli			USA, Oklahoma Garber Formation USA, Texas Waggoner Ranch Formation	Artinskian
Mycterosaurus smithae	Lewis & Vaughn, 1965				USA, Colorado Cutler Formation	Asselian

Varanopinae

• The list currently includes 7 species
• 7 are considered valid species

Species	Authority	Synonyms	Status	Notes	Location	Age	Images
Aerosaurus greenleeorum	Romer, 1937				USA, New Mexico Abo/Cutler Formation	Asselian
Aerosaurus wellesi	Langston & Reisz, 1981				USA, New Mexico Abo/Cutler Formation	Asselian
Ruthiromia elcobriensis	Eberth & Brinkman, 1983				USA, New Mexico Abo/Cutler Formation	Asselian
Tambacarnifex unguifalcatus	Berman, Henrici, Sumida, Martens & Pelletier, 2014				Germany, Thuringia Tambach Formation	Artinskian
Varanodon agilis	Olson, 1965				USA, Oklahoma Chickasha Formation	Roadian
Varanops brevirostris	Williston, 1911	Varanosaurus brevirostris			USA, Oklahoma Garber Formation USA, Texas Arroyo Formation	Artinskian to Kungurian
Watongia meieri	Olson, 1974				USA, Oklahoma Chickasha Formation	Roadian

Other Varanopids

• The list currently includes 4 species
• 3 are considered valid species
• 1 are considered either nomina dubia or incertae sedis

Species	Authority	Synonyms	Status	Notes	Location	Age	Images
Apsisaurus witteri	Laurin, 1991			Basal	USA, Texas Putnam Formation	Asselian
Archaeovenator hamiltonensis	Reisz & Dilkes, 2003			Basal	USA, Kansas Calhoun Shale	Gzhelian
Pyozia mesenensis	Anderson & Reisz, 2004			Basal	Russia, Arkhangelsk Krasnoshchel' Formation	Capitanian
Thrausmosaurus serratidens	Fox, 1962			Nomen dubium	USA, Oklahoma Garber Formation	Artinskian

Other synapsids

• The list currently includes 6 species
• 6 are considered either nomina dubia or incertae sedis

Species	Authority	Synonyms	Status	Notes	Location	Age	Images
Echinerpeton intermedium	Reisz, 1972			Incertae sedis	Canada, Nova Scotia Morien Group	Moscovian
Gorgodon minutus	Olson, 1962			Incertae sedis	USA, Texas San Angelo Formation	Kungurian
Ianthodon schultzei	Kissel & Reisz, 2004			Eupelycosaurian Incertae sedis	USA, Kansas Stanton Formation	Kasimovian
Milosaurus mccordi	Demar, 1970			Incertae sedis	USA, Illinois Mottoon Formation	Kasimovian
Nitosaurus jacksonorum	Romer, 1937			Incertae sedis	USA, New Mexico Abo/Cutler Formation	Asselian
Protoclepsydrops haplous	Carroll, 1964			Possible synapsid	Canada, Nova Scotia Joggins Formation	Moscovian