Therapsids

Cross references:  Mammals     Sauropsids       Labyrinthodonts   
Permian Discontinuity     Subcortical Brain      

Therapsida (Wiki)   
http://en.wikipedia.org/wiki/Therapsid  

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Therapsida is a group of the most advanced synapsids, and include the ancestors of mammals.[1] Many of the traits today seen as unique to mammals had their origin within early therapsids, including hair, lactation, and an erect posture.
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The therapsids included the cynodonts, the group that gave rise to mammals in the Late Triassic around 225 million years ago.
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Mammals, the only living therapsids, evolved in the Early Jurassic period.
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