Synapsid
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Synapsids (Greek: "fused-arch") were the ancestors of modern mammals. They are significant in an evolutionary sense because of their lizard-like appearance, illustrating the transition from reptiles to egg-laying mammals. Therefore, they are no doubt one of the most frightening things to creationist wackos, who probably try to convince themselves they were eaten by velociraptors on the ark.
The fossils of a synapsid (Lystrosaurus) were used as evidence of continental drift.
As soft tissue does not preserve, it is unknown whether they had hair or mammary glands, though they are occasionally depicted with hair.