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Basic arrangement of spider eyes, viewed from above. Most spiders have eight eyes, which tend to be arranged into two rows of four eyes on the head region. The eyes can be categorised by their location and are divided into the anterior median eyes (AME), anterior lateral eyes (ALE), posterior median eyes (PME), and posterior lateral eyes (PLE).
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 ...
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.
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]
Forest Spiders of South East Asia: With a Revision of the Sac and Ground Spiders. Brill Publishers. ISBN 978-9004119598. Eaton, Eric R.; Kaufman, Kenn (2007). Kaufman Field Guide to Insects of North America. Houghton Mifflin Harcourt. ISBN 978-0618153107. Filmer, Martin R. (1991). Southern African Spiders: An Identification Guide. Random House.
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 ...
From January 2008 to December 2012, if you bought shares in companies when Charles O. Holliday, Jr. joined the board, and sold them when he left, you would have a -38.1 percent return on your investment, compared to a -2.8 percent return from the S&P 500.
This approach typically does not result in the exact original source code but rather a divergent version, as a binary program does not contain all of the information originally carried in the source code. For example, comments and function names cannot be restored if the program was compiled without additional debug information.