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While many Uloborus species construct stabilimenta

 There is much controversy surrounding the function of these structures, and it is likely that different species use it for different purposes. Some people[who?] believe that they provide protection to the spider by either camouflaging it or making it appear larger. Another theory is that they make the spider visible and therefore animals such as birds are less likely to damage the spider’s web.[3] Originally the decorations were thought to stabilize the web (hence the term stabilimentum), though this theory has since been dismissed. One more recent theory is that web decorations attract prey by reflecting ultraviolet light.[4] Light in the ultraviolet part of the spectrum is known to be attractive to many species of insects.[4] Many other theories have also been proposed such as thermoregulation, stress, regulation of excess silk, or simple aesthetics. At least one variant has been observed to vibrate the web, while positioned in the stabilimentum, when approached by a body the size of a human. Another theory is camouflage as it breaks up the outline of the spider. One theory has been put forward that the purpose of the stabilimentum is to attract the male of the species to the web when the female is ready to reproduce. A limited study carried out in the Calahonda area of Spain in the summer of 1992 showed that there was a positive correlation between the presence of a male in the webs of Argiope lobata and the presence of a stabilimentum.[5][citation needed]

While many Uloborus species construct stabilimenta, Uloborus gibbosus does not; it usually rests at an edge of its orb and drops to the ground if disturbed. This is thought to support the web camouflage hypothesis. The strongly UV-reflecting stabilimentum of the uloborid Octonoba sybotides was found to be attractive to Drosophila flies.[1]

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