User blog comment:Lord Loss/Monster Appreciation Week: Silver Rathalos and Gold Rathian/@comment-6050823-20130908215529/@comment-3277384-20130909161446

I'll try to explain you. Dinosauria si a Group of Archosauria, which is a group of Diapsida which is a Group of Reptilia. So dinosaurs are part of the Group "Reptilia", so in terms of evolution they are reptiles. Following your theory, whales and dolphins aren't mammals because they got fins.