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The eggcase of Sicarius is unique among spiders. Its masonry wall resembles in texture the nests of mud dauber wasps.. And, unlike other spider eggcases, it is buried in sand, attached to stones. We do not know of any other masonry construction by spiders, or of other buried eggsacs. Some spiders incorporate sand grains and detritus into their webs or their trapdoors. The European theridiid Achaearanea saxatile (C. L. Koch) makes a thimble-shaped retreat for herself and her silken eggsacdoi:10.1155/1969/96480 fatcat:eb36m7k225bz3kwemzm4g2tjwi