I'm not claiming that the platipus is devoid of cousins or has no evolutionary tree (although I think it would be an interesting challenge to see you try to provide said tree).
My claim is that the platipus is an example of a big design introduction. It has at least two unique features for mammals, in fact, such as poison spurs on its feet and an electro-sensing bill.
Such big design introductions are predicted by Intelligent Design.
If you have evidence to the contrary, then please present it.
But they only happen in the gaps. You may now have the last word, which will be the same as your last four posts on the subject.
Actually, some moles have electrical sensors on their snouts; helps 'em find nice, juicy worms, doncha know.