> Dinosaurs (including birds) are reptiles, now that Reptilia has been defined > as all taxa more closely related to modern turtles, tuataras, squamates and > crocodilians than to modern mammals. > > Mickey Mortimer So _Dimetrodon_ and _Edaphosaurus_ aren't considered reptiles anymore... Where do they belong then? Cheers - Luc J. BAILLY.