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Cyclosa, also called trashline orbweavers, is a genus of orb-weaver spiders first described by Anton Menge in 1866. Widely distributed worldwide, spiders of the genus Cyclosa build relatively small orb webs with a web decoration. The web decoration in Cyclosa spiders is often linear and includes prey remains and other debris, which probably serve to camouflage the spider.

These spiders are known to be both biting and venomous, but their bites are thought to be unable to seriously injure healthy humans and other large animals, such as dogs.

They create the so-called "trashline" web, which is a line of various components such as prey's carcasses, detritus, and, at times, egg cases. This trashline appears to hinder the predators from visually locating the spider within its web. The trashline" helps the spider to camouflage exceptionally well. But, even though the trashline itself attracts attacking wasps, these wasps are unable to locate the spider within the web since the debris of the web's decoration is of similar color, size, and shape as the spider itself. Because of the variability in the amount of silk reserves the spider has, webs of different diameters may be created. However, larger web diameters do not impact the insect-trapping efficiency of stabilimenta-adorned webs, and instead, the efficiency is dependent solely on the presence of stabilimenta, a type of web decoration.

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