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
Synapsida
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Synapsida is a diverse group of tetrapod vertebrates that includes all mammals and their extinct relatives. It is one of the two major clades of the group Amniota, the other being the more diverse gro
Sphenacodontia
…Sphenacodontia is a stem-based clade of derived synapsids. It was defined by Amson and Laurin (2011) as "the largest clade that includes Haptodus baylei, Haptodus garnettensis and Sphenacodon ferox, but not…
Synapsid diversity 3
Skull of Cotylorhynchus, a basal synapsid
Diagram showing synapsid jaw evolution from early "pelycosaur" synapsids to modern mammals
The sea otter has the densest fur of modern mammals.