Spiders (order Araneae) are air-breathing arthropods that have eight legs, chelicerae with fangs generally able to inject venom,[2] and spinnerets that extrude silk.[3] They are the largest order of arachnids and rank seventh in total species diversity among all orders of organisms.[4][5] Spiders are found worldwide on every continent except for Antarctica, and have become established in nearly every land habitat. As of August 2022, 50,356 spider species in 132 families have been recorded by taxonomists.[1] However, there has been debate among scientists about how families should be classified, with over 20 different classifications proposed since 1900.[6]
Anatomically, spiders (as with all arachnids) differ from other arthropods in that the usual body segments are fused into two tagmata, the cephalothorax or prosoma, and the 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.
Spiders are the largest entirely carnivorous group of animals on the planet. Without Spiders, insects would reach pest proportions throughout the entire world. Spiders are not insects. Spiders prey on other organisms, usually insects. Spiders use a wide range of strategies to capture prey: trapping it in sticky webs, lassoing it with sticky balls, mimicking the prey to avoid detection or running it down. Some of the most common Spiderss include the following: orb weavers, known for weaving large, circular webs; cobweb Spiderss, which includes the venomous black widow; wolf Spiderss, large Spiderss that hunt at night; tarantulas, huge, hairy hunting Spiderss; and jumping Spiderss, tiny Spiderss with big eyes and bigger persona I ities.
HEALTH HAZARDS:
Black widows and brown recluse Spiders are considered dangerous to humans. They like warm, dry climates and undisturbed areas so they can hide in basement, closets, and attics in your house. Bites from both the black widow and brown recluse Spiders are dangerous to humans and require prompt emergency medical care.
CONTROL AND MANAGEMENT MEASURES:
Remove some infestation sources such as clutter in the yard and crawl spaces and any ground covers against the foundational walls. Any sanitation step to remove favorable conditions is the first step in Spiders control. Getting rid of other insects with a routine insecticide treatment should be considered.
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