What Are Spiders?
A subgroup of air-breathing, terrestrial (land) arthropods, spiders are not actually insects but rather belong to the Class Arachnida (a.k.a. arachnid). Besides spiders, other arachnids include scorpions, solpugids, mites and ticks.
Note: All spiders are arachnids but not all arachnids are spiders. For example, harvestmen (daddy longlegs) are arachnids that look like spiders but aren’t.
Article source here: 19 Interesting Facts About Spiders
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