SPIDER || THE APPU WORLD
Spiders have two eyes with four eyes in the upper front of the cephalothorax, arranged in patterns that vary from family to family. The first couple is the so-called pigment-cup ocelli ("small eyes"), which is the only arthropods that can detect the source of light, using a shadow created by the walls of a cup. However, in spiders these eyes can form images. Some pairs, called second-sighted, are thought to be derived from the compound eyes of ancestral chelicerates, but no longer have the distinctive features common to compound eyes. Unlike the big eyes, in many spiders these second eyes receive light from a bright tapetum lucidum, and wolf spiders can be seen with a flashlight displayed on the tapeta. The spider's second eye, on the other hand, has no tapes.
Another difference between the primary and secondary eyes is that the latter have rhabdomeres that point away from incoming light, as in vertebrates, while the arrangement is opposite the previous one. Only the main eyes also have eye muscles, which allow them to move the retina. Since they do not have muscles, the second eyes do not move.
The visual beauty of some jumping spiders surpasses that of a dragonfly, which has a magnificent view of insects. eyes and combine images from different stages of scanning. Too bad the scanning and merging process is slow.
There are Spiders with a small number of eyes, most commonly having six eyes (e.g., Periegops suterii) with two eyes that are not in the inner lining. Some species have four eyes and members of the Caponiidae family may have as little as two. Cave species have no eyes, or have dark eyes that cannot see.
Like other arthropods, the cuticles of the cuticles can block information about the outside world, without having multiple sensors or connections from the nerves to the nervous system. In fact, spiders and other arthropods have transformed their cuticles into numerous sensory columns. Various sensory nerves, especially those with brushes called setae, respond to varying degrees of intensity, from strong contact to very weak air waves. Chemical sensors provide similar flavor and aroma, often using setae. Adult Araneus may have as many as 1,000 such setae, especially in the first two legs. Men have more chemosensitive bristles on their pedipalps than women. It has been shown to respond to sexually transmitted pheromones produced by women, both those affected and transmitted by the air. Jumping spider Evarcha culicivora uses blood odors from mammals and other vertebrates, obtained by catching blood-laden mosquitoes, to attract the opposite sex. Because they are able to distinguish between males and females, it is thought that blood odor is associated with pheromones. Spiders also have limbs in their legs that break down nerves that gain strength and vibration. In web-building spiders, all of these mechanical and chemical sensors are more important than the eyes, while the eyes are more important to spider-hunting spiders.
Like most arthropods, spiders lack the sense of proportion and speed that depend on their eyes to tell them which way to go. Arthropods' proprioceptors, nerves that report muscle release and the degree of flexion of the body and joints, are well understood. On the other hand, little is known about what other internal spider mites or other arthropods may have.
There is strong evidence that Spider mice are hidden that help them escape their large prey, birds and parasitic wasps, both of which have a good color vision. Many species of spiders have colors to match their most common backgrounds, while others have disturbing colors, stripes and bullets that break their frames. In a few species, such as the happy-faced Hawaiian spider, the Theridion grallator, there are a number of color schemes available at a seemingly constant rate, and this can make it even harder for predators to spot this species. Many spiders are not dangerous enough or have no taste at all in warning color to provide the greatest benefit. However, a few species with severe pain, large jaws or irritating bristles have warning color marks, and some show these colors when threatened.
Most of the family Theraphosidae, which includes tarantulas and baboon spiders, have hair that urinates on their stomachs and uses their legs to attach themselves to predators. These particles are fine setae (bristles) with weak bases and a line of barbs on the tip. Barbs cause a lot of irritation but there is no evidence that they carry any kind of poison. A few protect themselves from wasps by installing very strong fiber networks on their web, giving the spider time to escape while the wasps fight off obstacles. A gold-wheeled gold spider, Carparachne aureoflava, from the Namibian desert escapes the insects' wasps by swinging its side and hitting the cart on sand dunes.
Spiders have been the subject of stories and myths for various cultures for centuries. Uttu, an ancient Sumerian
the goddess of weaving, she was thought of as a spider web. According to his great legend, he rebelled against his father
Enki's sexual advances in adapting to her web, but let her in after promising her a new product as a wedding
gift, thus allowing him to drink beer and rape her. Enki's wife Ninhursag heard Uttu's cries again
saved him, removed Enki's sperm from his vagina and planted it in the ground to produce eight previously missing ones
plants. In the story told by the Roman poet Ovid to his Metamorphoses, Arachne was a young woman named Lydia who challenged the goddess
Athena in the weaving contest. Arachne won, but Athena ruined her art because of jealousy, which she did
Arachne to hang itself. In an act of kindness, Athena restored Arachne to life as the first spider.
Stories about trickster Anansi's spider are central to West African and Caribbean legends.
In some cultures, spiders have shown patience because of their hunting habit of setting webs and waiting for prey
as evil and evil because of their bites by danger. The Italian tarantella is a dance to remove this lady
lustful effects of spider bites. Spinning the web has also led to a combination of spider and creative myths, as they appear
to have the ability to produce their own lands. Dream researchers are spider sketches. The ancient people of Moche
Peru served nature. They emphasized animals and often portrayed spiders in their art.
In 2019, the U.S. Regional Court Northern Alabama has determined that spiders are insects in Robinson v. Liberty Mutual. 2020, the 11th
The Regional Court of Appeals upheld the decision. The Court of Appeal said, "Alabama law requires courts to apply the principles of
insurance according to its general meaning. So unless the context suggests otherwise, the terms of the policy should not be
given a technical or scientific explanation. "The case arose because the Robinson family's home was full of brown distances
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