15 Most Dangerous Spiders In The World | Top 15 Venomous Spiders | Danger Spiders | Animal's Galaxy
Channel: Animal's galaxy
Date: 19/01/2021

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This video is about 15 Most Dangerous Spiders In The World | Top 15 Venomous Spiders | Danger Spiders

This Video is include 15 Most Dangerous Spiders In The World | Top 15 Venomous Spiders | Danger Spiders
                
                 Spiders (order Araneae) are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom, and spinnerets that extrude silk. They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms. Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every habitat with the exceptions of air and sea colonization. As of July 2019, at least 48,200 spider species, and 120 families have been recorded by taxonomists. However, there has been dissension within the scientific community as to how all these families should be classified, as evidenced by the over 20 different classifications that have been proposed since 1900.

                  Anatomically, spiders (as with all arachnids) differ from other arthropods in that the usual body segments are fused into two tagmata, the prosoma, or cephalothorax, and opisthosoma, or abdomen, and joined by a small, cylindrical pedicel (however, as there is currently neither paleontological nor embryological evidence that spiders ever had a separate thorax-like division, there exists an argument against the validity of the term cephalothorax, which means fused cephalon (head) and the thorax. Similarly, arguments can be formed against use of the term abdomen, as the opisthosoma of all spiders contains a heart and respiratory organs, organs atypical of an abdomen). Unlike insects, spiders do not have antennae. In all except the most primitive group, the Mesothelae, spiders have the most centralized nervous systems of all arthropods, as all their ganglia are fused into one mass in the cephalothorax. Unlike most arthropods, spiders have no extensor muscles in their limbs and instead extend them by hydraulic pressure.

                The Brazilian Wandering Spider is a large brown spider similar to North American Wolf Spiders, but bigger and possessing a more toxic venom. It has the most neurologically active venom of all spiders, and is regarded as the most dangerous spider in the world. Brazilian Wandering Spiders are active hunters and travel a lot. They tend to crawl into cozy, comfortable places for the night and sometimes crawl into fruits and flowers that humans consume and cultivate. If the spider has a reason to be alarmed, it will bite in order to protect itself, but unless startled or aggravated, most bites will be delivered dry (i.e. without venom). Venom bites will occur if the spider is pressed against something or hurt. In this case, the high levels of serotonin contained in the venom will deliver a very painful bite that can result in muscle shock.

⭕ Spiders Scientific Classification,
🌟 Kingdom - Animalia.
🌟 Phylum - Arthropoda
🌟 Class - Arachnida
🌟 Order - Araneae
🌟 Subphylum - Chelicerata


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