These guys are built for speed, and if you look at the plates, you see that they alternate between larger and smaller. This helps to reduce the undulations that come naturally from a slender object running forward at great speeds.
And because everyone want to know,"What is the difference between a centipede and a millipede?" I have always looked at the number of legs per segment and if it is one, then it is a centipede. There are other characteristics and this chart sums them up.