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Most spiders' eyes can detect little more than brightness and motion, so vision plays only a minor role in behaviour. However some species, such as jumping spiders, wolf spiders, and deinopids, have more developed eyes which they use in hunting and courtship. [2]
Spiders do not have compound eyes, but instead have several pairs of simple eyes with each pair adapted for a specific task or tasks. The principal and secondary eyes in spiders are arranged in four, or occasionally fewer, pairs. Only the principal eyes have moveable retinas. The secondary eyes have a reflector at the back of the eyes.
Spiders also have several adaptations that distinguish them from other arachnids. All spiders are capable of producing silk of various types, which many species use to build webs to ensnare prey. Most spiders possess venom, which is injected into prey (or defensively, when the spider feels threatened) through the fangs of the chelicerae. Male ...
Like spiders in general, most species of Mygalomorphae have eight eyes, one pair of principal and three pairs of secondary eyes. Chelicerae of a black wishbone spider ( Nemesiidae ) Their chelicerae and fangs are large and powerful and have ample venom glands that lie entirely within their chelicerae .
The estimations are based on research into how many spiders live on a square meter of land for all main habitat types of earth, and the average amount of food consumed by spiders of different ...
The outer pair are "secondary eyes" and there are other pairs of secondary eyes on the sides and top of its head. [25] Eyes of the jumping spider, Plexippus paykulli. Spiders have primarily four pairs of eyes on the top-front area of the cephalothorax, arranged in patterns that vary from one family to another. [13]
With so many kinds of eight-legged bugs running around (nearly 3,000 species in North America alone!), the most common house spiders are bound to pop up in your abode from time to time. And with ...
Outdoor spiders are hard at work, devouring home and garden pests such as ants, flies, mosquitoes, aphids, and thrips. It’s estimated they kill 400 to 800 million metric tons of prey worldwide ...