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Abstract
Spiders’ silks and webs have made it possible for this diverse taxon to occupy a unique niche as the main predator for another, even more diverse taxon, the insects. Indeed, it might well be that the spiders, which are older, were a major force driving the insects into their diversity in a coevolutionary arms race. The spiders’ weapons were their silks and here we explore the evidence for the evolution of silk production and web building as traits in spider phylogeny.