I Am Extinct

I am low to the ground, covered lizard, I will always be I am not easy to catch, even more difficult to see. I have not been around for ages, this pun thanks to ice. If I do say so, and I do, my rounded back is very nice. Forensic experts spent many years wiring bones to see What I looked like when I was alive, for the ice age truly scattered me. My tail was my weapon, a mighty blade, tipped with big spikes. Other dinosaurs stayed away from me and my vicious cousin, Tykes. My favorite foods were brad-berry bushes, and lawns-cloth grass, Bushes as extinct as me, probably unknown as the Ice Age came up fast! We did not have TV, we did not have a car, but we had a terrific life. Spoiler alert to this riddle now, a sweet stegosaurus was my wife.