- Synapsida, subclass Synapsida - extinct reptiles of the Permian to Jurassic considered ancestral to mammals
--1 is a kind of class
--1 is a member of Reptilia, class Reptilia
--1 has members:Therapsida, order Therapsida; Ictodosauria, order Ictodosauria; Pelycosauria, order Pelycosauria