Ehhh...I hate spiders...I think the entire spider population shoudl be replaced with frogs, I can live with frogs.... Actually though, I was at a friends house a couple of weeks ago and he pointed something out to me while running around kills spiders in his yard(We were forced into 4/5 hours of yard work out of nowhere). Spiders have no muscles or bones, save their exoskeleton. They have no evolutionary pattern, they're just spiders, always have been and always will be. The closest living thing to spiders are crabs, yet neither of them are related. Essentially, he believes(and I kind of agree) that spiders are basically an alien species.
If anyone can prove this wrong, feel free to share the info, it just kinda made sense at the time he said it. I dunno....