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
Black garden ant Black garden ant The black garden ant ("Lasius niger"), also known as the common black ant, is a formicine ant, the type species of the subgenus "Lasius", found all over Europe and in some parts of North America, South America, Australia, Asia and Australasia. The European species was split into two species; "L. niger" is found in open areas, while "L. platythorax" is found in forest habitats. It is monogynous, meaning colonies have a single queen. "Lasius niger" colonies can reach in size up to around 40,000 workers in rare cases but 4,000–7,000 is around average. A "Lasius niger" queen