Temporal range: Late Carboniferous to Early Permian 308–280 Ma
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Mounted skeleton of Ophiacodon retroversus in the American Museum of Natural History
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Phylum:
Chordata
Clade:
Synapsida
Clade:
Metopophora
Family:
†Ophiacodontidae Nopcsa, 1923
Subgroups[1]
†Archaeothyris
†Baldwinonus
†Clepsydrops
†Echinerpeton
†Ophiacodon
†Protoclepsydrops?
†Stereophallodon
†Stereorhachis
†Varanosaurus
Ophiacodontidae is an extinct family of early synapsids from the Carboniferous and Permian. Archaeothyris, and Clepsydrops were among the earliest ophiacodontids, appearing in the Late Carboniferous. Ophiacodontids are among the most basal synapsids, an offshoot of the lineage which includes therapsids and their descendants, the mammals. The group became extinct by the Kungurian or the Roadian,[2] replaced by anomodonts, theriodonts, and the diapsid reptiles.
^Mann, A.; Paterson, R. S. (2020). "Cranial osteology and systematics of the enigmatic early 'sail-backed' synapsid Echinerpeton intermedium Reisz, 1972, and a review of the earliest 'pelycosaurs'". Journal of Systematic Palaeontology. 18 (6): 529–539. doi:10.1080/14772019.2019.1648323. S2CID 202847907.
^Didier, Gilles; Laurin, Michel (9 December 2021). "Distributions of extinction times from fossil ages and tree topologies: the example of mid-Permian synapsid extinctions". PeerJ. 9: e12577. doi:10.7717/peerj.12577. ISSN 2167-8359. PMC 8667717. PMID 34966586.
Ophiacodontidae is an extinct family of early synapsids from the Carboniferous and Permian. Archaeothyris, and Clepsydrops were among the earliest ophiacodontids...
Family Caseidae Suborder Eupelycosauria Family Varanopidae Family Ophiacodontidae Family Edaphosauridae Infraorder Sphenacodontia Family Sphenacodontidae...
the second.[citation needed] Archaeothyris belonged to the family Ophiacodontidae, a group of early pelycosaurs that evolved early in the Late Carboniferous...
synapsid clade, Benson's analysis (2012) placed a clade containing Ophiacodontidae and Varanopidae as the most basal synapsids, with Caseasauria occupying...
"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...
Petrolacosauridae Class Synapsida Order Pelycosauria Family Varanopidae Family Ophiacodontidae Family Edaphosauridae Family Sphenacodontidae List of Permian tetrapods...
Paleontology or palaeontology is the study of prehistoric life forms on Earth through the examination of plant and animal fossils. This includes the study...
the Reptiles, Williston listed the name Secodontosaurus under the Ophiacodontidae, presumably as the new genus from 1916, but did not provide a description...
Pelycosauria Family Eothyrididae Family Caseidae Family Varanopidae Family Ophiacodontidae Family Edaphosauridae Family Sphenacodontidae Order Therapsida Tetraceratops...
Xyrospondylus, which may also be an edaphosaurid; an undescribed member of Ophiacodontidae that has been assigned to Ophiacodon and Clepsydrops; and possibly...
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