Ophiacodon

Ophiacodon; Temporal range: Late Carboniferous to Early Permian
	Skeleton of O. mirus in the Field Museum of Natural History, Chicago
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Family:	†Ophiacodontidae
Genus:	†Ophiacodon; Marsh, 1878
Type species
	†Ophiacodon mirus; Marsh, 1878
Other species
	†O. hilli Romer, 1925; †O. major Romer & Price, 1940; †O. navajovicus (Case, 1907 [originally Dimetrodon navajovicus]); †O. retroversus Cope, 1878; †O. uniformis Cope, 1878;
Synonyms
	Arribasaurus; Dinopeles; Diopaeus; Poliosaurus; Theropleura; Therosaurus Huene, 1925 (preoccupied); Winfeldia;

Ophiacodon (meaning "snake tooth") is an extinct genus of synapsid belonging to the family Ophiacodontidae that lived from the Late Carboniferous to the Early Permian in North America and Europe. The genus was named along with its type species O. mirus by paleontologist Othniel Charles Marsh in 1878 and currently includes five other species.^[1] As an ophiacodontid, Ophiacodon is one of the most basal synapsids and is close to the evolutionary line leading to mammals.^[2]

^ Felice, R. N. & Angielczyk, K. D. (2014). "Was Ophiacodon (Synapsida, Eupelycosauria) a Swimmer? A Test Using Vertebral Dimensions". Early Evolutionary History of the Synapsida. Vertebrate Paleobiology and Paleoanthropology. p. 25. doi:10.1007/978-94-007-6841-3_3. ISBN 978-94-007-6840-6.
^ Maddin, H.C.; Evans, D.C. & Reisz, R.R. (2006). "An Early Permian varanodontine varanopid (Synapsida: Eupelycosauria) from the Richards Spur Locality, Oklahoma". Journal of Vertebrate Paleontology. 26 (4): 957–966. doi:10.1671/0272-4634(2006)26[957:aepvvs]2.0.co;2.

[FA13-1] Felice, R. N. & Angielczyk, K. D. (2014). "Was Ophiacodon (Synapsida, Eupelycosauria) a Swimmer? A Test Using Vertebral Dimensions". Early Evolutionary History of the Synapsida. Vertebrate Paleobiology and Paleoanthropology. p. 25. doi:10.1007/978-94-007-6841-3_3. ISBN 978-94-007-6840-6.

[maddin2006-2] Maddin, H.C.; Evans, D.C. & Reisz, R.R. (2006). "An Early Permian varanodontine varanopid (Synapsida: Eupelycosauria) from the Richards Spur Locality, Oklahoma". Journal of Vertebrate Paleontology. 26 (4): 957–966. doi:10.1671/0272-4634(2006)26[957:aepvvs]2.0.co;2.

[1]

[2]

Ophiacodon Temporal range: Late Carboniferous to Early Permian

Skeleton of O. mirus in the Field Museum of Natural History, Chicago
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Clade:	Synapsida
Family:	†Ophiacodontidae
Genus:	†Ophiacodon Marsh, 1878
Type species
†Ophiacodon mirus Marsh, 1878
Other species
†O. hilli Romer, 1925 †O. major Romer & Price, 1940 †O. navajovicus (Case, 1907 [originally Dimetrodon navajovicus]) †O. retroversus Cope, 1878 †O. uniformis Cope, 1878
Synonyms
Arribasaurus Dinopeles Diopaeus Poliosaurus Theropleura Therosaurus Huene, 1925 (preoccupied) Winfeldia