 At best, the cladists suggest, we could say that the traditional Reptilia are 'non-avian, non-mammalian amniotes'.Despite the early proposals for replacing the paraphyletic Reptilia with a monophyletic Sauropsida, which includes birds, that term was never adopted widely or, when it was, was not applied consistently.When Sauropsida was used, it often had the same content or even the same definition as Reptilia.