Kentrosaurus aethiopicus was a cousin of the Stegosaurus which lived in Africa during the late Jurassic period, around 155-150 million years ago. It stood out from its North American cousin by having narrower plates, a greater number of spikes on its tail, and then a pair of large spikes sticking out of its shoulder. It was also a lot smaller, weighing little more than a single ton (whereas Stegosaurus could grow between five and seven tons).