Spider are apparently absent. In some species, the exocuticle of the legs and prosoma is modified by a tanning process, resulting in brown coloration. Bilins are found, for example, in "Micrommata virescens", resulting in its green color. Guanine is responsible for the white markings of the European garden spider "Araneus diadematus". It is in many species accumulated in specialized cells called guanocytes. In genera such as "Tetragnatha", "Leucauge", "Argyrodes" or "Theridiosoma", guanine creates their silvery appearance. While guanine is originally an end-product of protein metabolism, its excretion can be blocked in spiders, leading to an increase in its storage. Structural colors
Garden Creek site Garden Creek site Garden Creek site is an archaeological site located west of Asheville, North Carolina in Haywood County at the confluence of the Pigeon River and Garden Creek near Canton and the Pisgah National Forest. The site features two Pisgah Phase villages (31Hw7) and the three Garden Creek Mounds (31Hw1-3). The two villages located on the site were occupied from 600 CE to 1200 CE, first by Woodland period Hopewellian peoples and later by Pisgah Phase people of the South Appalachian Mississippian culture (a regional variation of the Mississippian culture). Pisgah phase artefacts "are widely thought to represent a