Sphenacodontia
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Sphenacodontia is a stem-based clade of derived synapsids. It was defined by Amson and Laurin as "the largest clade that includes Haptodus baylei, Haptodus garnettensis and Sphenacodon ferox, but not
Alopecognathus angusticeps DB
Pantelosaurus, from the Early Permian
Raranimus dashankouensis
Therapsida
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Therapsida is a major group of eupelycosaurian synapsids. It includes mammals, as well as their ancestors and close relatives. Many defining traits of modern mammals had their origins within early the
Sphenacodontia
…sphenacodontians were small carnivores, though the group also includes large carnivores, such as the famous Dimetrodon (Sphenacodontidae). The group includes Therapsida, the only living subclade of Synapsida (including living mammals), which is most closely related to Sphenacodontidae within Sphenacodontia as part of…
Therapsida 3
Holotype skull of Raranimus dashankouensis, the most basal-known therapsid
Restoration of Euchambersia with dicynodont prey. Note that this South African therocephalian is suspected to be the oldest-known venomous tetrapod.
Biarmosuchus, a biarmosuchian