A fossil reptile of a Permian and Triassic group the members of which show increasingly mammalian characteristics and include the ancestors of mammals
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synapsidsA fossil reptile of a Permian and Triassic group, the members of which show increasingly mammalian characteristics and include the ancestors of mammals
synapsidA fossil reptile of a Permian and Triassic group, the members of which show increasingly mammalian characteristics and include the ancestors of mammals
therapsidAn extinct reptile of a Permian and Triassic order, the members of which are related to the ancestors of mammals
therapsidsAn extinct reptile of a Permian and Triassic order, the members of which are related to the ancestors of mammals