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The evolution of spiders' eyes has received little attention, and as such not much is known on the subject. The principal and secondary eyes likely evolved separately, with the principal eyes being homologous to the ocelli of insects but the secondary eyes being derived from compound eyes.
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.
[9] [10] The lower Cambrian had a burst of apparently rapid evolution, called the "Cambrian explosion". One of the many hypotheses for "causes" of the Cambrian explosion is the "Light Switch" theory of Andrew Parker: it holds that the evolution of advanced eyes started an arms race that accelerated evolution. [11]
People do not swallow large numbers of spiders during sleep. A sleeping person makes noises that warn spiders of danger. [93] [94] Most people also wake up from sleep when they have a spider on their face. [95] A female Chinese mantis simultaneously copulating with and cannibalizing her mate; this does not occur every time mantises mate.
Cheryl Y. Hayashi is a biologist who specializes in the evolution and functional properties of spider silk.She is the Provost and Sr. Vice President for Science at the American Museum of Natural History, where she is a curator and professor in the Division of Invertebrate Zoology.
In some Eastern traditions, the spider takes on the symbolic role of illusion itself. "In Hindu and Buddhist tradition, the spider is connected to illusion. Think 'web of illusion,'" Popescu explains.
A spider web preserved in amber, thought to be 110 million years old, shows evidence of a perfect "orb" web, the most famous, circular kind one thinks of when imagining spider webs. An examination of the drift of those genes thought to be used to produce the web-spinning behavior suggests that orb spinning was in an advanced state as many as ...
Rather than letting technology dictate outcomes, systemic thinking urges us to design our tools with a deliberate ethos—recognizing that how we employ AI will profoundly affect the foundations ...