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
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
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
Therapsida
…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 therapsids…
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.