10 Interesting Facts About Spiders: Explore Arthropods Empire!

Maybe, the spider isn’t your favorite creature to look at, but some people love them. There are fascinating facts about them which get them noticed either. Regardless of where you stand on the subject, you will find these facts about spiders fascinating.
Spiders are air-breathing arthropods which have 8 legs and chelicera with fangs which inject venom. They are the biggest order of arachnids and rank 7th in the total species diversity among all other orders of organisms.
Spiders are found all over the world on each continent except Antarctica and have become established in almost each habitat with the exceptions of sea and air colonization.
Besides, there has been dissension in the scientific community to determine how all these families should be classified, as evidenced by more than 20 different classifications which have been proposed since 1900.
Spiders differ anatomically from other arthropods since the usual body segments are bonded into two tagmata, the abdomen, and cephalothorax, and linked by a tiny, cylindrical pedicel. Unlike the majority of insects, spiders lack antennae.
All spiders except the highly primitive group, called Mesothelium, have the highly centralized nervous systems of all other arthropods since all their ganglia are bonded into one mass in the cephalothorax. Unlike many arthropods, spiders lack extensor muscles in their limbs therefore they extend them through hydraulic pressure.
Their abdomens have appendages which have been improved into spinnerets which extrude silk from up to 6 kinds of glands. Spider webs differ broadly in shape, size and the number of sticky thread used. Now, it seems the spiral orb web may be of the earliest types, and spiders which produce tangled cobwebs are more diverse and many than orb-web spiders.
Spider in net close upSpider-like arachnids having silk-producing spigots existed during the Devonian period approximately 386 million years ago, but these creatures actually lacked spinnerets. Real spiders have been discovered in Carboniferous rocks from nearly 318-299 million years ago and are extremely similar to the highly primitive living suborder, the Mesothelae. The predominant groups of contemporary spiders, Araneomorphae, and Mygalomorphae, first appeared during the Triassic period, prior to the last 200 million years.
In 2008, the herbivorous species was discovered, but all other identified species are predators, commonly preying on other spiders and insects, though some huge species also take lizards and birds. Spiders use a broad range of approaches to capture their prey.
These tricks include mimicking the prey to prevent any detection, lassoing it with sticky bolas, trapping it in their sticky webs, or running it down.
Majority detects prey mostly by sensing any vibrations, but the active hunters possess acute vision, and hunters of the genus Portia demonstrate signs of strong intelligence in their selection of tactics and capacity to create new ones. The guts of spiders are very narrow to consume solids, and they first liquefy their diet by flooding it with the digestive enzymes and crushing it with the bases of their pedipalps, as they lack true jaws.
Male spiders often identify themselves by various elaborate courtship rituals to prevent being eaten by their females. Males of many species survive some matings, limited majorly by their short life spans. All females weave silk egg-cases, which may hold hundreds of eggs. Females of most species good care for their young, for instance by sharing food with them or by carrying them around.
The marginal of species are very social, building communal webs which may accommodate each member from a small number up to 50,000 individuals. Social behavior ranges from co-operative food-sharing and hunting to precarious toleration, as in the case of widow spiders. Even though many spiders live for not more than two years, tarantulas and any other mygalomorph spiders can live for about 25 years in captivity.
Even though the venom of some species is risky to human beings, scientists are currently researching the use of spider venom as non-polluting pesticides and for medical purposes. Spider silk offers a combination of strength, elasticity and lightness that is stronger to that of synthetic fabrics, and the spider-silk genes have been inserted into plants and mammals to determine if these can be used in silk factories.
As a result of their huge range of behaviors, spiders have become popular symbols in art and mythology symbolizing different combinations of creative powers, cruelty, and patience. An abnormal fear of spiders is known as arachnophobia.
Interesting spider facts:
1. Spiders alongside snails and lobsters have blue-colored blood because of the presence of hemocyanin that contains copper.
2. Spiders are always scared of ants because of the formic acid they contain.
3. Not all spiders spin webs. Many people associate spiders with webs, but some do not build webs at all. For example, Wolf spiders stalk and overtake their prey, without the assistance of a web. Jumping spiders that have incredibly good eyesight and move faster, have no need for webs, either. They just pounce on their prey!
4. Except a single family, all spiders are venomous. Spiders usually use venom to subdue their prey. The venom glands are located near the chelicerae, or fangs, and are attached to the fangs by ducts. Whenever a spider bites its prey, the muscles around the venom glands contract, forcing its venom through the fangs and into the animal. The venom paralyzes the prey.
5. Spiders do not move by muscle alone. Spiders depend on a combination of hemolymph (blood) pressure and muscle to move their legs. Some joints in spider legs don’t have extensor muscles fully.
6. Spiders often eat their webs to recycle them.
7. In western Iran, there is a viper with a fake spider for a tail.
8. Spider silk is nearly five times stronger than steel of equal weight.
9. Spiders can survive for some hours underwater by entering a self-induced coma.
10. Research shows that if you are afraid of spiders, you are more likely to find one in your bedroom!

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