The mammals represent the only living Synapsida, which together with the Sauropsida form the Amniota clade.
The early synapsid mammalian ancestors were sphenacodont pelycosaurs, a group that produced the non-mammalian Dimetrodon.
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Much of the changes reflect the advances of cladistic analysis and molecular genetics.
Findings from molecular genetics, for example, have prompted adopting new groups, such as the Afrotheria, and abandoning traditional groups, such as the Insectivora.
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