High Quality Content by WIKIPEDIA articles! Pachydectes is an extinct genus of non-mammalian synapsid.Synapsids ('fused arch') are a class of animals that includes mammals and everything more closely related to mammals than to other living amniotes. Primitive synapsids are usually called pelycosaurs; more advanced mammal-liked ones, therapsids. Synapsids evolved from basal amniotes and are one of the two major groups of the later amniotes, the other major group being the sauropsids (reptiles and birds).

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