Slimming down makes reproduction quicker and cheaper. Seven legs will do just fine, so long as you don’t need too much energy. You’ll need to settle for nice slow lifestyle.

You keep leg pairs on the first seven of your body sections, which are all part of your thorax. You still have an abdoment behind, but it’s just a gut in an exoskeleton. You can’t move very fast, or very far, unless you hitch a lift on a larger animal. But hey, while you’re hanging on to something else, what do you do if you get peckish…?

There’s a posibility here that you could eat some of the detritus that the bigger animal leaves, if it’s a messy eater.

Or perhaps something even more extreme?