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to the dinosaurs, hence in turn to birds; and to all the extinct amniotes more closely related to them than to mammals. Primitive synapsids were traditionally called "mammal-like reptiles" or "pelycosaurs", but both are now seen as outdated and disfavored paraphyletic terms, since they were not reptiles, nor part of reptile lineage. The modern term for these is "stem mammals", and sometimes

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