Quote:
Originally posted by stephanie m.
No, I didnt know that. Neat though, so are crocks and celocanths. It makes you wonder why they didnt continue to evolve. Maybe they have reached perfection. I dont know if spiders are social, so I dont know how they would get along. I know that spiders and scorpions do NOT! Good luck, postapic when its done. 
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Yes, I think that may be it also. Evolution happens when a mutation/developed difference gives an advantage over "standard" members of the species, and thus makes the superior specimens able to produce more offspring in the long-term, washing out the weaker genes slowly but surely. Spiders seem to be perfect as they are, and capable of producing masses of offspring in almost any environment.
The evidence of their evolutionary perfection can also be seen on the millions upon millions of sub-species, who in effect are nothing but small environment-fitted variations of the basic model.