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noun
Extinct reptiles of the Permian to Jurassic considered ancestral to mammals.
synonym: Synapsida.
is a specific kind of: class.
has as a member: order Therapsida, Therapsida | Ictodosauria, order Ictodosauria | order Pelycosauria, Pelycosauria.
is a member of: class Reptilia, Reptilia.
Polish: synapsydy
Find more on subclass Synapsida elsewhere: etymology - rhymes - Wikipedia.
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