Synapsida
extinct reptiles of the Permian to Jurassic considered ancestral to mammals • Syn: subclass Synapsida • Hypernyms: class • Member Holonyms: Reptilia, class Reptilia • Member Meronyms: Therapsida, order Therapsida, Ictodosauria, order Ictodosauria, Pelycosauria, order Pelycosauria
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