The most popular arachnids of the animal kingdom. Spiders are part of this family and can come in thousands of shapes and sizes. Unlike insects, spiders have their body divided into two fragments and are characterized by their 8 legs.
Distributed throughout the world there are more than 40 thousand types of spiders, each one particularly different. Among the best known are the different types of tarantulas, feared for their size and how dangerous they can be; and home spiders, which are the ones we find most in everyday life hidden in the different ceilings and walls of our home.
Another type of less popular spiders are those that feed on the nectar of trees, called vegetarian because they have this type of diet, but they are quite difficult to find. Certain groups of spiders also live near the water and thanks to this their diet is the most varied of the entire animal kingdom, being able to swallow even fish.
Just as its peculiarities impress us, there are also a series of curious facts about arachnids. Something that may seem creepy about these creatures is that they do not have muscles and therefore use the pressure of their own blood to move.
Something that you should also take into account when approaching these animals is that they all have poison. What can vary considerably is the type of poison they use since that of some spiders can be quite powerful, while others can feel like the sting of an ant without causing major consequences.
Spiders are also of great use to humans. Scientists around the world have learned to take advantage of these animals since the way they produce, combined with contemporary technology, solve many everyday problems. As science advances, more discoveries are made around them.
For example, being considered the strongest material in the world, the silk produced by spiders can be worked to be used in the creation of strings for different musical instruments such as the violin and also in the manufacture of robots.
Likewise, its poison is not only dangerous, but is used in the treatment of problems with erectile dysfunction in men.
Also in nature we can find forms of this specimen that vary even in their vision. Although they coincide in terms of the number of their legs, which are eight, the same does not happen with their number of eyes since they can vary depending on the species.
What do you need:
- Information about spiders
- Spiders
- Spider eyes
- Spider webs
Instructions
- They are very different: The first thing we should know about the eyes of spiders is that their quantity can vary depending on the species. Just as the colors and models of these arachnids also vary their number of eyes that is why we must be attentive to know what species it is.
The number of eyes a spider has can speak volumes about its overall lifestyle and habitat. Sometimes their eyes can be so small, equivalent to the size of the arachnid, that they are almost imperceptible to human sight. You have to pay close attention to what can be discovered from each specimen. - They have 8 eyes: Most species of spiders agree on a single number, that is, 8. this is the most common data among these arachnids, but more than eyes they should be called photoreceptors because they help them perceive light more than anything else.
These 4 pairs of celli help them to locate themselves within their environment, being guided by the contrast of shadows that are formed by the entrance of light into them. The vision of spiders with this amount is distributed throughout the frontal area of its body, helping it to position itself more easily. Something that we must also take into account is that the 8 eyes of certain spiders will vary in size, both among themselves, as we said depending on the type of spider. We also have to tell you that their movement is very similar to that of our eyes. They can move them both horizontally and vertically and even in a rotary way. By being able to move their eyes any way they want and being arranged over most of their body, spiders will have up to 360-degree vision . This action helps them not have to move a lot to know what is happening around them. - Some have 6 eyes. There is an entire family of spiders that only have 6 eyes, deviating from the common rule. They are called scared and can be found in different areas of the planet depending on the specific type of each species. Its habitat can range from temperate to desert areas.
Within this group of arachnids are the violin spider, the corner spider and also the sand spider, to mention some of the best known. Each of the spiders belonging to this family group, regardless of the gender to which they belong, become quite dangerous and even deadly for any living being, including humans. - Others have even numbers. Just as there are spiders with 8 and 6 eyes, you can also find them with other numbers but always in even numbers. There are so-called armored spiders that have only two pairs of eyes, they stand out above the rest because of a pattern that forms on their abdomens and that simulates armor, hence their name. They can form a fairly complex group within the arachnids, being found mostly in the southeast of the Chinese country.
Likewise, other spiders that are out of the ordinary are those that have only two eyes. There are many theories about this dilemma since some scientists say that there are currently none left, but there are fossils that show that at one time they were part of the planet. Others, on the other hand, assure that the Caponiidae family is spiders with these characteristics but they are unusual. What they do agree on is that the variety of spider eyes will always be in even numbers, being the way in which they have their vision structured as arachnids. They are animals that can become very complex despite their small size and where there are still things to discover regarding their vision. - Each pair of eyes works differently. Each pair of eyes in the spider has a very specific function adapted to the way of getting its food. One of the most important is the eyes that are in the center because they allow them to form a specific image of their victim. This pair of eyes stands out for being the others for being larger. Then you have to continue describing the pairs of eyes they use to locate them in space and thus know how they should move. The pair that is in the back laterally helps them to fix the place where they will go and another pair will serve to make the correct measurement of the angle with respect to their figure.
The last pair of eyes will help her measure the distance these animals will travel to get to where they need it. As you can see, each pair of eyes is useful for something, which is why we talk to you in a general way about most spiders, that is, those that have 8 eyes, but with the particular species that do not walk them, the distribution and functions will be different. - Good and bad vision: There is a very big dilemma regarding the vision of spiders, some claim that they have excellent eyesight and others that they do not know how to locate themselves and that are why they tend to be quite lonely. The truth is that this varies according to the species.
Some spiders are practically blind, despite their large number of eyes. Weavers, for example, often use other senses such as smell or touch to carry out their daily activities.
There is also the opposite case, those who have a highly effective vision. In this case, the ones that stand out the most are the Jumping spiders, since they have a highly developed sense of Being able to perceive images clearly and with an advantage over the rest of their relatives.
Tips
When we talk to you about this type of animal, we always tell you that the best thing to do is be careful. Spiders are complex animals that can cause a lot of damage, their eyes can warn you how much danger they represent, in combination with their size, so pay attention to what kind of animal you are facing.
Spiders have 2, 4, 6 or the typical 8 eyes; they become extremely varied animals since knowing about each one gives a different experience about how their development in nature has been.
They are a species that in its more than 30 thousand forms teach us how different the different living beings can become, even if they belong to the same family or to the same species in particular.
