List of pelycosaurs - AbsoluteAstronomy.com

This list of pelycosaurs is an attempt to create a comprehensive listing of all genera

Genus

In biology, a genus is a low-level taxonomic rank used in the biological classification of living and fossil organisms, which is an example of definition by genus and differentia...

that have ever been included in the synapsida excluding mammals and purely vernacular terms. The list includes all commonly accepted genera, but also genera that are now considered invalid, doubtful (nomina dubia
Nomen dubium
In zoological nomenclature, a nomen dubium is a scientific name that is of unknown or doubtful application...

), or were not formally published (nomina nuda
Nomen nudum
The phrase nomen nudum is a Latin term, meaning "naked name", used in taxonomy...

), as well as junior synonyms of more established names, and genera that are no longer considered pelycosaurs.

The list currently contains 80 generic names.

Naming conventions and terminology

Naming conventions and terminology follow the International Code of Zoological Nomenclature

International Code of Zoological Nomenclature

The International Code of Zoological Nomenclature is a widely accepted convention in zoology that rules the formal scientific naming of organisms treated as animals...

. 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
Nomen nudum
The phrase nomen nudum is a Latin term, meaning "naked name", used in taxonomy...

(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
Nomen oblitum
A nomen oblitum is a technical term, used in zoological nomenclature, for a particular kind of disused scientific name....

(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
Nomen dubium
In zoological nomenclature, a nomen dubium is a scientific name that is of unknown or doubtful application...

(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.

List

Genus	Authors	Year	Status	Age	Location	Notes
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Aerosaurus Aerosaurus Aerosaurus is an extinct genus within Varanopidae, a family of non-mammalian synapsids. It lived from the Late Carboniferous to Early Permian in North America.-References:...	Romer	1937 1937 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Late Carboniferous - Lower Permian	United States of America
Angelosaurus Angelosaurus Angelosaurus dolani was a pelycosaur of reptile. It is known from a partial skull from the Middle San Angelo Formation, Knox County, Texas, USA. It dates from the Kungurian . It was from three to three and a half metres long and weighed about 300 kilograms...	Olson Beerbower	1953 1953 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Valid.	Upper Permian	United States of America
Anglosaurus	Bruner	1991 1991 in paleontology -Birds:* Sankar Chatterjee's discovery of a possible Triassic bird, Protoavis, if genuine, would push avian origins back almost 70 million years. The find ignites controversy over the connection between dinosaurs and birds....	Sic	N/A	N/A	Incorrect spelling for Angelosaurus
Apsisaurus Apsisaurus Apsisaurus is an extinct genus of Early Permian varanopid synapsid known from Texas of the United States. It was first named by Michel Laurin in 1991 and the type species is Apsisaurus witteri. Apsisaurus witteri is known from the holotype MCZ 1474, a three-dimensionally preserved partial...	Laurin	1991 1991 in paleontology -Birds:* Sankar Chatterjee's discovery of a possible Triassic bird, Protoavis, if genuine, would push avian origins back almost 70 million years. The find ignites controversy over the connection between dinosaurs and birds....	Valid.	Lower Permian	United States of America
Archaeobelus	Cope	1877 1877 in paleontology -Fish:-Non-dinosaurian reptiles:-Laelaps trihedrodon, Cope criticizes Dryptosaurus:O. W. Lucas collected the first remains of what would later in the year be named Laelaps trihedrodon from Quarry I of the Saurian Hill at Garden Park, Colorado...	Syn.	N/A	N/A	Synonym of Clepsydrops
Archaeothyris Archaeothyris Archaeothyris was a very early mammal-like reptile, which lived in the late Carboniferous period. Dated to 306 million years ago, it is the oldest undisputed synapsid known....	Reisz	1972 1972 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Upper Carboniferous	United States of America
Archaeovenator Archaeovenator Archaeovenator is an extinct genus of Late Carboniferous varanopid synapsid known from Greenwood County, Kansas of the United States. It was first named by Robert R. Reisz and David W. Dilkes in 2003 and the type species is Archaeovenator hamiltonensis...	Reisz Dilkes	2003 2003 in paleontology -New taxa:-Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-New taxa:-Non-mammalian:-newly named:-Conifers:-Angiosperms:...	Valid.	Upper Carboniferous	United States of America
Arribasaurus	Williston	1914 1914 in paleontology -Dinosaurs:* Eugene Stebinger became the first to identify the Two Medicine Formation and to formally described its first fossil finds, which were excavated the previous year.-Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr...	Syn.	N/A	N/A	Synonym of Ophiacodon
Baldwinonus Baldwinonus Baldwinonus is an extinct genus of non-mammalian synapsid.-References:*...	Romer Price	1940 1940 in paleontology -Newly named dinosaurs:Data coutersy of George Olshevky's dinosaur genera list.-New taxa:-Non-mammalian:...	Valid.	Late Carboniferous - Early Permian	United States of America
Basicranodon	Vaughn	1958 1958 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Syn.	Lower Permian	United States of America	Synonym of Mycterosaurus
Bathyglyptus	Case	1911	Syn.	N/A	N/A	Synonym of Dimetrodon
Bathygnathus Bathygnathus Bathygnathus was a pelycosaur-grade synapsid, a non-dinosaurian amniote which lived during the Permian Period . The only specimen of Bathygnathus was discovered on Prince Edward Island during the course of a well excavation, in Spring Brook in the New London area and its significance recognized by...	Leidy	1854 1854 in paleontology -Newly named dinosaurs:-Newly named plesiosaurs:-Non-mammalian:...	Valid.	Lower Permian	United States of America
Brachycnemius	Williston	1911	Syn.	N/A	N/A	Synonym of Edaphosaurus
Callibrachion	Boule Glangeau	1893 1893 in paleontology -Newly named dinosaurs:-New taxa:-Non-mammalian:...	Syn.	N/A	N/A	Synonym of Haptodus
Casea Casea Casea is an extinct genus of pelycosaur synapsid which was about long, slightly smaller than the otherwise very similar Caseoides. Casea was one of the first terrestrial herbivores, sharing its world with animals such as Dimetrodon and Eryops.-Description:Casea had a heavy, rotund, body and a...	Williston	1910 1910 in paleontology -Dinosaurs:* AMNH 5244, a ceratopsian braincase, was found isolated during an American Museum of Natural History Barnum Brown-led expedition.-Newly named dinosaurs:...	Valid.	Lower Permian	France and United States of America
Caseoides Caseoides Caseoides was a large pelycosaur synapsid that lived in the Kungurian Age . It was about 3 meters long, and like many other caseids, it was herbivorous. It weighed between 150 kg to 200 kg. Its fossils were found on Texas. Caseoides was very similar to Casea, but was slightly larger in size...	Olson Beerbower	1953 1953 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Valid.	Lower Permian	United States of America
Caseopsis Caseopsis Caseopsis was a large pelycosaur that was about 3 meters long. Caseopsis lived in the late Early Permian epoch , before the pelycosaurs were replaced by the more advanced therapsids . It was a lightly built, agile creature. It may have been possible for this species to outpace and escape large...	Olson	1962 1962 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Upper Permian	United States of America
Clepsydrops Clepsydrops Clepsydrops was a primitive amniote from the early Late Carboniferous that was related to Archaeothyris and the synapsids—the ancestors of mammals. Like many other terrestrial early amniotes, it had the diet of insects and smaller animals. It also laid eggs on land rather than in the water, as...	Cope	1875 1875 in paleontology -Dinosaurs:-New taxa:-Non-mammalian:...	Valid.	Late Carboniferous	United States of America
Colobomycter Colobomycter Colobomycter is a small parareptile known from the Early Permian of Oklahoma. The genus was first described from fossil remains in 1958, at which time it was believed to represent a synapsid , specifically, a pelycosaur. However, the discovery of new material and reexamination of the holotype led...	Vaughn	1958 1958 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Lower Permian	United States of America	Its a protorothyridid eureptile
Cotylorhynchus Cotylorhynchus Cotylorhynchus was a very large mammal-like reptile that lived in the southern part of what is now North America during the Early Permian period and persisted until the late-Mid Permian...	Stovall	1937 1937 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Lower Permian	United States of America
Cryptovenator Cryptovenator Cryptovenator is an extinct genus of sphenacodontid pelycosaur which existed in Germany during the latest Carboniferous...	Fröbisch Schoch Müller Schindler Schweiss	in press	Nomen manuscriptum	Late Carboniferous	Germany
Ctenorhachis Ctenorhachis Ctenorhachis is an extinct genus of the family Sphenacodontidae. Ctenorhachis was related to Dimetrodon, but did not belong to the same subfamily as Dimetrodon and Sphenacodon, being a more basal member of Sphenacodontidae. Ctenorhachis lived in the Early Permian epoch...	Hook Hotton	1991 1991 in paleontology -Birds:* Sankar Chatterjee's discovery of a possible Triassic bird, Protoavis, if genuine, would push avian origins back almost 70 million years. The find ignites controversy over the connection between dinosaurs and birds....	Valid.	Upper Permian	United States of America
Ctenospondylus Ctenospondylus Ctenospondylus, was a pelycosaur that was about 3 meters long. It lived from Latest Carboniferous to Early Permian. Its fossils were found in the U.S. states of Ohio and Texas. It was a carnivore and preyed upon animals close to its size...	Romer	1936 1936 in paleontology -Insects:-Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Valid.	Lower Permian	United States
Cutleria	Lewis Vaughn	1965 1965 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Preocc.	N/A	N/A	Preoccupied by thalloid brown alga genus Cutleria . Synonym of Haptodus
Delorhynchus Delorhynchus Delorhynchus is an extinct genus of non-mammalian synapsid.-References:*...	Fox	1962 1962 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Lower Permian	United States of America	Originally descript as a pelycosaur, but probably a parareptile
Datheosaurus	Schroeder	1905 1905 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Syn.	N/A	N/A	Synonym of Haptodus
Dimacrodon Dimacrodon Dimacrodon is an extinct genus of non-mammalian synapsid. Originally descript as a anomodont therapsid by Olson & Beerbower and Olson , its lack any diagnostic features of anomodonts and rather represent pelycosaur-grade synapsids....	Olson Beerbower	1953 1953 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Valid?	Lower Permian	United States	Originally descript as a anomodont therapsid by Olson & Beerbower (1953) and Olson (1962), its lack any diagnostic features of anomodonts and rather represent pelycosaur-grade synapsids
Dimetrodon Dimetrodon Dimetrodon was a predatory synapsid genus that flourished during the Permian period, living between 280–265 million years ago ....	Cope	1878 1878 in paleontology -Dinosaurs:O. W. Lucas recovers more material which would be referred to Laelaps trihedrodon from Morrison Formation strata near Garden Park, Colorado.-Newly named plesiosaurs:-Non-mammalian:...	Valid.	Early Permian - Middle Permian	United States of America and Germany
Diopaeus	Cope	1892 1892 in paleontology -Newly named dinosaurs:-New taxa:-Non-mammalian:...	Syn.	N/A	N/A	Synonym of Ophiacodon
Echinerpeton Echinerpeton Echinerpeton is an extinct genus of non-mammalian synapsid.-References:*...	Reisz	1972 1972 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Upper Carboniferous	Canada
Edaphosaurus Edaphosaurus Edaphosaurus is a genus of prehistoric synapsid which lived around 303 to 265 million years ago, during the late Carboniferous to early Permian periods. The name Edaphosaurus means "ground lizard" and is derived from the Greek edaphos/εδαφος and σαυρος/sauros...	Cope	1882 1882 in paleontology -Dinosaurs:-Non-mammalian:-Paleontologists:* The fossil collection of the recently deceased Reverend William Fox, which contained over 500 specimens, was bought by the trustees of the British Museum of Natural History....	Valid.	Late Carboniferous - Lower Permian	Czech Republic and United States of America
Elcabrosaurus	Case	1907 1907 in paleontology -Insects:-Dinosaurs:* Wieland claims to have found stegosaur gastroliths.* Brown argues that Wieland's alleged stegosaur gastroliths were "not associated with the stegosaur bones in question."* Possible hadrosaur gastroliths documented.-Newly named dinosaurs:...	Syn.	N/A	N/A	Synonym of Sphenacodon
Elliotsmithia Elliotsmithia Elliotsmithia is an extinct genus of non-mammalian synapsid.-References:*...	Broom	1937 1937 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Middle-Upper Permian	South Africa
Embolophorus	Cope	1878 1878 in paleontology -Dinosaurs:O. W. Lucas recovers more material which would be referred to Laelaps trihedrodon from Morrison Formation strata near Garden Park, Colorado.-Newly named plesiosaurs:-Non-mammalian:...	Valid.	N/A	N/A	Synonym of Dimetrodon
Ennatosaurus Ennatosaurus Ennatosaurus was a mammal-like reptile that lived in Russia during the Wordian stage of the Permian period. It is included in the synapsid clade Caseidae in the order Pelycosauria....	Efremov	1956 1956 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Lower Permian	Russia
Eothyris Eothyris Eothyris is an extinct genus of the family Eothyrididae. It was an insectivorous synapsid. It was closely related to Oedaleops.-Discovery and species:...	Romer	1937 1937 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Lower Permian	United States of America
Eumatthevia	Broom	1930 1930 in paleontology -Newly named dinosaurs:-New taxa:-Non-mammalian:...	Syn.	N/A	N/A	Synonym of Mycterosaurus
Glaucosaurus Glaucosaurus Glaucosaurus is an extinct genus of non-mammalian synapsid.-References:*...	Williston	1915 1915 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Turtles:-Non-mammalian:...	Valid.	Lower Permian	United States of America
Haptodus Haptodus Haptodus was a small sphenacodont, a clade that includes therapsids and hence, mammals. It was at least in length. It lived from Latest Carboniferous to Early Permian, in the equatorial Pangea. It was a medium-sized predator, feeding on insects and small vertebrates. It is one of the basalmost...	Gaudry	1866 1886 in paleontology -Dinosaurs:-New taxa:-Non-mammalian:...	Valid.	Late Carboniferous - Lower Permian	United States of America and Europe
Heleosaurus Heleosaurus Heleosaurus is an extinct genus of non-mammalian synapsid from the Late Permian of South Africa. It was originally described as a diapsid reptile.-References:...	Broom	1907 1907 in paleontology -Insects:-Dinosaurs:* Wieland claims to have found stegosaur gastroliths.* Brown argues that Wieland's alleged stegosaur gastroliths were "not associated with the stegosaur bones in question."* Possible hadrosaur gastroliths documented.-Newly named dinosaurs:...	Valid.	Upper Permian	South Africa
Ianthasaurus Ianthasaurus Ianthasaurus was a small edaphosaurid from the Late Pennsylvanian. Ianthasaurus lacks many of the spectacular specializations seen in Edaphosaurus. For example, the marginal dentition of Ianthasaurus is similar to that of insectivorous reptiles, with slender conical teeth which are slightly...	Reisz Berman	1986 1986 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Pterosaurs:...	Valid.	Late Carboniferous	United States of America
Ianthodon Ianthodon Ianthodon is an extinct genus of non-mammalian synapsid from the Late Carboniferous of United States of America.-References:* Kissel, R. A. & Reisz, R. R. Synapsid fauna of the Upper Pennsylvanian Rock Lake Shale near Garnett, Kansas and the diversity pattern of early amniotes. In G. Arratia, M. V....	Kissel Reisz	2004 2004 in paleontology -New taxa:-newly named:-newly named:-New taxa:-Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-New taxa:-Non-mammalian:...	Valid.	Upper Carboniferous	United States of America
Ianthosaurus	Reisz Berman	1986 1986 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Pterosaurs:...	Sic	N/A	N/A	Incorrect spelling of Ianthasaurus
Lupeosaurus Lupeosaurus Lupeosaurus is an extinct genus of pelycosaurian synapsid, assigned to the family Lupeosauridae. It is believed to be more closely related to the Edaphosauridae family than to the Sphenacodontidae, such as Dimetrodon....	Romer	1937 1937 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Lower Permian	United States of America
Macromerion Macromerion Macromerion is an extinct genus of non-mammalian synapsid from the Late Carboniferous of Germany.-References:* Paton, R. L. 1974. Lower Permian pelycosaurs from the English midlands. Paleontology 17 : 541-552....	Fritsch	1879 1879 in paleontology -Dinosaurs:-Non-mammalian:...	Valid.	Upper Carboniferous	Germany
Mesenosaurus Mesenosaurus Mesenosaurus is an extinct genus of non-mammalian synapsid, the only know species within this genus in the Mesenosaurus romeri.-References:*...	Efremov	1938 1938 in paleontology -Non-mammalian:-Mammals :...	Valid.	Lower Permian	Russia
Mesonosaurus	Ivakhnenko Kurzanov	1979 1979 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:-References:...	Sic	N/A	N/A	Incorrect spelling of Mesenosaurus
Milosaurus Milosaurus Milosaurus is an extinct genus of non-mammalian synapsid.-References:*...	DeMar	1970 1970 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Valid.	Upper Carboniferous	United States of America
Mycterosaurus Mycterosaurus Mycterosaurus was a pelycosaur belonging to the family Varanopidae of the subfamily Mycterosaurinae. Mycterosaurus is the most primitive member of its family. It lacks some features that its advanced relatives have....	Williston	1915 1915 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Turtles:-Non-mammalian:...	Valid.	Lower Permian	United States of America
Naosaurus	Cope	1886 1886 in paleontology -Dinosaurs:-New taxa:-Non-mammalian:...	Syn.	N/A	N/A	Synonym of Edaphosaurus
Neosaurus Neosaurus Neosaurus is a little-known pelycosaur of the family Sphenacodontidae. It was related to the well known Dimetrodon, although much smaller and lived during the Early Permian. Its fossils were found in the Jura region of France....	Nopsca	1923 1923 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Valid.	Lower Permian	France
Nitosaurus Nitosaurus Nitosaurus is an extinct genus of non-mammalian synapsid.-References:*...	Romer	1937 1937 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Lower Permian	United States of America
Oedaleops Oedaleops Oedaleops is an extinct genus of the family Eothyrididae. It was closely related to Eothyris. Like Eothyris, it was probably an insectivore.-Discovery and species:...	Langston	1965 1965 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Valid.	Lower Permian	United States of America
Ophiacodon Ophiacodon Ophiacodon was a large pelycosaur. Its fossils were found in Joggins, Nova Scotia, Canada.Ophiacodon was at least two meters in length, and the largest species were up to . It is estimated to have weighed from . The size of the various species increased during the Early Permian epoch until its...	Marsh	1878 1878 in paleontology -Dinosaurs:O. W. Lucas recovers more material which would be referred to Laelaps trihedrodon from Morrison Formation strata near Garden Park, Colorado.-Newly named plesiosaurs:-Non-mammalian:...	Valid.	Late Carboniferous-Lower Permian	United States of America and England
Oromycter Oromycter Oromycter is an extinct genus of pelycosaur from Lower Permian of Oklahoma. Only one species is recorded, Oromycter dolesorum.-References:*...	Reisz	2005 2005 in paleontology -New taxa:-New taxa:-Xiphosurans:* Fossils of Lunataspis, the earliest known xiphosuran, are discovered in Canada. It was not given a formal description until 2008, however.-New taxa:-Newly named dinosaurs:...	Valid.	Lower Permian	United States of America
Oxyodon	Huene	1908 1908 in paleontology -Newly named dinosaurs:Data coutersy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Preocc.	N/A	N/A	Preoccupied by fish genus Oxyodon . Synonym of Sphenacodon
Palaeohatteria	Credner	1888 1888 in paleontology -Dinosaurs:-Newly named plesiosaurs:-New taxa:-Non-mammalian:...	Syn.	N/A	N/A	Synonym of Haptodus
Pantelosaurus	von Huene	1925 1925 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Syn.	N/A	N/A	Synonym of Haptodus
Phreatophasma Phreatophasma Phreatophasma is an extinct genus of non-mammalian synapsid.-References:*...	Efremov	1954 1954 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Middle Permian	Russia
Poecilospondylus Varanosaurus Varanosaurus is an extinct genus of early pelycosaur synapsid that lived during the early Permian .As its name implies, Varanosaurus looked very similar to present-day monitor lizards...	Case	1910 1910 in paleontology -Dinosaurs:* AMNH 5244, a ceratopsian braincase, was found isolated during an American Museum of Natural History Barnum Brown-led expedition.-Newly named dinosaurs:...	Syn.	N/A	N/A	Synonym of Varanosaurus
Poliosaurus	Case	1907 1907 in paleontology -Insects:-Dinosaurs:* Wieland claims to have found stegosaur gastroliths.* Brown argues that Wieland's alleged stegosaur gastroliths were "not associated with the stegosaur bones in question."* Possible hadrosaur gastroliths documented.-Newly named dinosaurs:...	Syn.	N/A	N/A	Synonym of Ophiacodon
Protoclepsydrops Protoclepsydrops Protoclepsydrops was an early amniote, and its skeletal remains indicate that it may have been more closely related to synapsids than to sauropsids, making it a possible synapsid member. If so, it is the oldest synapsid known, though its status is unconfirmed because its remains were fragmentary....	Carroll	1964 1964 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-New taxa:-Non-mammalian:...	Valid.	Upper Carboniferous	Canada
Pyozia Pyozia Pyozia is an extinct genus of basal Middle Permian varanopid synapsid known from Russia. It was first named by Jason S. Anderson and Robert R. Reisz in 2004 and the type species is Pyozia mesenensis. Pyozia mesenensis is known from the holotype PIN 3717/33, a three-dimensionally preserved...	Anderson Reisz	2004 2004 in paleontology -New taxa:-newly named:-newly named:-New taxa:-Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-New taxa:-Non-mammalian:...	Valid.	Middle Permian	Russia
Ruthiromia Ruthiromia Ruthiromia is an extinct genus of non-mammalian synapsid from the Early Permian of United States of America.-References:* Eberth, D. A. & Brinkman, D. 1983. Ruthiromia elcobriensis, a new pelycosaur from El Cobre Canyon, New Mexico. Breviora 474: 1-27....	Eberth Brinkman	1983 1983 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Valid.	Lower Permian	United States of America
Scoliomus	Williston Case	1915 1915 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Turtles:-Non-mammalian:...	Syn.	Lower Permian	United States of America	Junior synonym of Sphenacodon
Secodontosaurus Secodontosaurus Secodontosaurus was a pelycosaur that lived in Texas during the Early Permian age. Though it had the same body style as other sphenacodontids, it had an unusually low and narrow skull. It had a long neural spines, like Dimetrodon, which Secodontosaurus was related to...	Romer	1936 1936 in paleontology -Insects:-Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Valid.	Lower Permian	United States of America
Sphenacodon Sphenacodon Sphenacodon was a pelycosaur that was about in length. Sphenacodon belongs to the family Sphenacodontidae, a lineage that was related to the therapsids...	Marsh	1878 1878 in paleontology -Dinosaurs:O. W. Lucas recovers more material which would be referred to Laelaps trihedrodon from Morrison Formation strata near Garden Park, Colorado.-Newly named plesiosaurs:-Non-mammalian:...	Valid.	Late Carboniferous	United States of America and England
Stereophallodon Stereophallodon Stereophallodon is an extinct genus of non-mammalian synapsid.-References:*...	Romer	1937 1937 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Late Carboniferous-Early Permian	United States of America
Stereorhachis Stereorhachis Stereorhachis is an extinct genus of non-mammalian synapsid from the Late Carboniferous of France.-References:* Sumida, S. J. & Martin, K. L. M. . Amniote Origins - Completing the Transition to Land. Academic Press, 1997. 510 p....	Gaudry	1880 1880 in paleontology -New taxa:-Non-mammalian:...	Valid.	Late Carboniferous	France
Theropleura Theropleura Theropleura is an extinct genus of non-mammalian synapsid.-References:*...	Cope	1878 1878 in paleontology -Dinosaurs:O. W. Lucas recovers more material which would be referred to Laelaps trihedrodon from Morrison Formation strata near Garden Park, Colorado.-Newly named plesiosaurs:-Non-mammalian:...	Syn.	N/A	N/A	Synonym of Ophiacodon (in partium) and Dimetrodon (in partium)
Therosaurus	von Huene	1925 1925 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Syn.	N/A	N/A	Synonym of Ophiacodon
Thrausmosaurus Thrausmosaurus Thrausmosaurus is a genus of synapsid pelycosaurs from the extinct family Varanopidae. Like all that resemble members of Varanopidae, Thrausmosaurus most likely resembled the modern monitor lizard and may have had the same lifestyle. The type and only species was described by R. C. Fox in 1962,...	Fox	1962 1962 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:...	Valid.	Lower Permian	United States of America	The type specie, T. serratidens, was declared to be a nomen dubium
Trichasaurus Trichasaurus Trichasaurus is an extinct genus of non-mammalian synapsid.-References:*...	Williston	1913 1913 in paleontology -Dinosaurs:* A US Geological Survey crew headed by Eugene Stebinger and a US National Museum crew headed by Charles Gilmore worked together to excavate the first dinosaur discovery of the Two Medicine Formation.-Newly named dinosaurs:...	Valid.	Lower Permian	United States of America	Replacement name for Trispondylus
Trispondylus	Williston	1910 1910 in paleontology -Dinosaurs:* AMNH 5244, a ceratopsian braincase, was found isolated during an American Museum of Natural History Barnum Brown-led expedition.-Newly named dinosaurs:...	Preocc.	N/A	N/A	Preoccupied by phenacodontid Trispondylus
Varanodon Varanodon Varanodon was a pelycosaur of the family Varanopidae.- References :* E. C. Olson. 1965. New Permian vertebrates from the Chickasha Formation in Oklahoma. Circular Oklahoma Geological Survey 70:1-70....	Olson	1965 1965 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Valid.	Lower Permian	United States of America
Varanops Varanops Varanops is an extinct genus of Early Permian varanopid synapsid known from Texas and Oklahoma of the United States. It was first named by Samuel Wendell Williston in 1911 as a second species of Varanosaurus, Varanosaurus brevirostris. In 1914, Samuel W. Williston reassigned it to its own genus and...	Williston	1911	Valid.	Lower Permian	United States of America
Varanosaurus Varanosaurus Varanosaurus is an extinct genus of early pelycosaur synapsid that lived during the early Permian .As its name implies, Varanosaurus looked very similar to present-day monitor lizards...	Broili	1904 1904 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-Non-mammalian:-References:* Brown, B. Stomach stones and food of plesiosaurs, Science, n.s. 20, : 184-185...	Valid.	Lower Permian	United States of America
Xyrospondylus Xyrospondylus Xyrospondylus is an extinct genus of non-mammalian synapsid.-References:*...	Reisz Heaton Pynn	1982 1982 in paleontology -Pteridophyta:-Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-New taxa:-New taxa:...	Valid.	Upper Carboniferous	United States of America
Watongia Watongia Watongia is an extinct genus of non-mammalian synapsid from Middle Permian of Oklahoma. Only one species is descript, Watongia meieri, from Chickasha Formation. Its was assigned to family Gorgonopsidae by Olson and to Eotitanosuchia by Carroll. Reisz and collaborators assigned the genus in...	Olson	1974 1974 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:-References:...	Valid.	Middle Permian	United States of America
Winfeldia	Romer	1925 1925 in paleontology -Newly named dinosaurs:Data courtesy of George Olshevsky's dinosaur genera list and Dr. Jeremy Montague's dinosaur genus database.-New taxa:-Non-mammalian:...	Syn.	N/A	N/A	Synonym of Ophiacodon

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External links

Mikko's Haaramo Phylogeny - Synapsida – Mammal-like amniotes

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